- 26 Jul, 2016 33 commits
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Alexey Dobriyan authored
When both arguments to kmalloc_array() or kcalloc() are known at compile time then their product is known at compile time but search for kmalloc cache happens at runtime not at compile time. Link: http://lkml.kernel.org/r/20160627213454.GA2440@p183.telecom.bySigned-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Michal Hocko authored
Both SLAB and SLUB BUG() when a caller provides an invalid gfp_mask. This is a rather harsh way to announce a non-critical issue. Allocator is free to ignore invalid flags. Let's simply replace BUG() by dump_stack to tell the offender and fixup the mask to move on with the allocation request. This is an example for kmalloc(GFP_KERNEL|__GFP_HIGHMEM) from a test module: Unexpected gfp: 0x2 (__GFP_HIGHMEM). Fixing up to gfp: 0x24000c0 (GFP_KERNEL). Fix your code! CPU: 0 PID: 2916 Comm: insmod Tainted: G O 4.6.0-slabgfp2-00002-g4cdfc2ef4892-dirty #936 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 Call Trace: dump_stack+0x67/0x90 cache_alloc_refill+0x201/0x617 kmem_cache_alloc_trace+0xa7/0x24a ? 0xffffffffa0005000 mymodule_init+0x20/0x1000 [test_slab] do_one_initcall+0xe7/0x16c ? rcu_read_lock_sched_held+0x61/0x69 ? kmem_cache_alloc_trace+0x197/0x24a do_init_module+0x5f/0x1d9 load_module+0x1a3d/0x1f21 ? retint_kernel+0x2d/0x2d SyS_init_module+0xe8/0x10e ? SyS_init_module+0xe8/0x10e do_syscall_64+0x68/0x13f entry_SYSCALL64_slow_path+0x25/0x25 Link: http://lkml.kernel.org/r/1465548200-11384-2-git-send-email-mhocko@kernel.orgSigned-off-by:Michal Hocko <mhocko@suse.com> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
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Michal Hocko authored
printk offers %pGg for quite some time so let's use it to get a human readable list of invalid flags. The original output would be [ 429.191962] gfp: 2 after the change [ 429.191962] Unexpected gfp: 0x2 (__GFP_HIGHMEM) Link: http://lkml.kernel.org/r/1465548200-11384-1-git-send-email-mhocko@kernel.orgSigned-off-by:
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Thomas Garnier authored
Implements freelist randomization for the SLUB allocator. It was previous implemented for the SLAB allocator. Both use the same configuration option (CONFIG_SLAB_FREELIST_RANDOM). The list is randomized during initialization of a new set of pages. The order on different freelist sizes is pre-computed at boot for performance. Each kmem_cache has its own randomized freelist. This security feature reduces the predictability of the kernel SLUB allocator against heap overflows rendering attacks much less stable. For example these attacks exploit the predictability of the heap: - Linux Kernel CAN SLUB overflow (https://goo.gl/oMNWkU) - Exploiting Linux Kernel Heap corruptions (http://goo.gl/EXLn95) Performance results: slab_test impact is between 3% to 4% on average for 100000 attempts without smp. It is a very focused testing, kernbench show the overall impact on the system is way lower. Before: Single thread testing ===================== 1. Kmalloc: Repeatedly allocate then free test 100000 times kmalloc(8) -> 49 cycles kfree -> 77 cycles 100000 times kmalloc(16) -> 51 cycles kfree -> 79 cycles 100000 times kmalloc(32) -> 53 cycles kfree -> 83 cycles 100000 times kmalloc(64) -> 62 cycles kfree -> 90 cycles 100000 times kmalloc(128) -> 81 cycles kfree -> 97 cycles 100000 times kmalloc(256) -> 98 cycles kfree -> 121 cycles 100000 times kmalloc(512) -> 95 cycles kfree -> 122 cycles 100000 times kmalloc(1024) -> 96 cycles kfree -> 126 cycles 100000 times kmalloc(2048) -> 115 cycles kfree -> 140 cycles 100000 times kmalloc(4096) -> 149 cycles kfree -> 171 cycles 2. Kmalloc: alloc/free test 100000 times kmalloc(8)/kfree -> 70 cycles 100000 times kmalloc(16)/kfree -> 70 cycles 100000 times kmalloc(32)/kfree -> 70 cycles 100000 times kmalloc(64)/kfree -> 70 cycles 100000 times kmalloc(128)/kfree -> 70 cycles 100000 times kmalloc(256)/kfree -> 69 cycles 100000 times kmalloc(512)/kfree -> 70 cycles 100000 times kmalloc(1024)/kfree -> 73 cycles 100000 times kmalloc(2048)/kfree -> 72 cycles 100000 times kmalloc(4096)/kfree -> 71 cycles After: Single thread testing ===================== 1. Kmalloc: Repeatedly allocate then free test 100000 times kmalloc(8) -> 57 cycles kfree -> 78 cycles 100000 times kmalloc(16) -> 61 cycles kfree -> 81 cycles 100000 times kmalloc(32) -> 76 cycles kfree -> 93 cycles 100000 times kmalloc(64) -> 83 cycles kfree -> 94 cycles 100000 times kmalloc(128) -> 106 cycles kfree -> 107 cycles 100000 times kmalloc(256) -> 118 cycles kfree -> 117 cycles 100000 times kmalloc(512) -> 114 cycles kfree -> 116 cycles 100000 times kmalloc(1024) -> 115 cycles kfree -> 118 cycles 100000 times kmalloc(2048) -> 147 cycles kfree -> 131 cycles 100000 times kmalloc(4096) -> 214 cycles kfree -> 161 cycles 2. Kmalloc: alloc/free test 100000 times kmalloc(8)/kfree -> 66 cycles 100000 times kmalloc(16)/kfree -> 66 cycles 100000 times kmalloc(32)/kfree -> 66 cycles 100000 times kmalloc(64)/kfree -> 66 cycles 100000 times kmalloc(128)/kfree -> 65 cycles 100000 times kmalloc(256)/kfree -> 67 cycles 100000 times kmalloc(512)/kfree -> 67 cycles 100000 times kmalloc(1024)/kfree -> 64 cycles 100000 times kmalloc(2048)/kfree -> 67 cycles 100000 times kmalloc(4096)/kfree -> 67 cycles Kernbench, before: Average Optimal load -j 12 Run (std deviation): Elapsed Time 101.873 (1.16069) User Time 1045.22 (1.60447) System Time 88.969 (0.559195) Percent CPU 1112.9 (13.8279) Context Switches 189140 (2282.15) Sleeps 99008.6 (768.091) After: Average Optimal load -j 12 Run (std deviation): Elapsed Time 102.47 (0.562732) User Time 1045.3 (1.34263) System Time 88.311 (0.342554) Percent CPU 1105.8 (6.49444) Context Switches 189081 (2355.78) Sleeps 99231.5 (800.358) Link: http://lkml.kernel.org/r/1464295031-26375-3-git-send-email-thgarnie@google.comSigned-off-by:
Thomas Garnier <thgarnie@google.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:
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Thomas Garnier authored
The kernel heap allocators are using a sequential freelist making their allocation predictable. This predictability makes kernel heap overflow easier to exploit. An attacker can careful prepare the kernel heap to control the following chunk overflowed. For example these attacks exploit the predictability of the heap: - Linux Kernel CAN SLUB overflow (https://goo.gl/oMNWkU) - Exploiting Linux Kernel Heap corruptions (http://goo.gl/EXLn95) ***Problems that needed solving: - Randomize the Freelist (singled linked) used in the SLUB allocator. - Ensure good performance to encourage usage. - Get best entropy in early boot stage. ***Parts: - 01/02 Reorganize the SLAB Freelist randomization to share elements with the SLUB implementation. - 02/02 The SLUB Freelist randomization implementation. Similar approach than the SLAB but tailored to the singled freelist used in SLUB. ***Performance data: slab_test impact is between 3% to 4% on average for 100000 attempts without smp. It is a very focused testing, kernbench show the overall impact on the system is way lower. Before: Single thread testing ===================== 1. Kmalloc: Repeatedly allocate then free test 100000 times kmalloc(8) -> 49 cycles kfree -> 77 cycles 100000 times kmalloc(16) -> 51 cycles kfree -> 79 cycles 100000 times kmalloc(32) -> 53 cycles kfree -> 83 cycles 100000 times kmalloc(64) -> 62 cycles kfree -> 90 cycles 100000 times kmalloc(128) -> 81 cycles kfree -> 97 cycles 100000 times kmalloc(256) -> 98 cycles kfree -> 121 cycles 100000 times kmalloc(512) -> 95 cycles kfree -> 122 cycles 100000 times kmalloc(1024) -> 96 cycles kfree -> 126 cycles 100000 times kmalloc(2048) -> 115 cycles kfree -> 140 cycles 100000 times kmalloc(4096) -> 149 cycles kfree -> 171 cycles 2. Kmalloc: alloc/free test 100000 times kmalloc(8)/kfree -> 70 cycles 100000 times kmalloc(16)/kfree -> 70 cycles 100000 times kmalloc(32)/kfree -> 70 cycles 100000 times kmalloc(64)/kfree -> 70 cycles 100000 times kmalloc(128)/kfree -> 70 cycles 100000 times kmalloc(256)/kfree -> 69 cycles 100000 times kmalloc(512)/kfree -> 70 cycles 100000 times kmalloc(1024)/kfree -> 73 cycles 100000 times kmalloc(2048)/kfree -> 72 cycles 100000 times kmalloc(4096)/kfree -> 71 cycles After: Single thread testing ===================== 1. Kmalloc: Repeatedly allocate then free test 100000 times kmalloc(8) -> 57 cycles kfree -> 78 cycles 100000 times kmalloc(16) -> 61 cycles kfree -> 81 cycles 100000 times kmalloc(32) -> 76 cycles kfree -> 93 cycles 100000 times kmalloc(64) -> 83 cycles kfree -> 94 cycles 100000 times kmalloc(128) -> 106 cycles kfree -> 107 cycles 100000 times kmalloc(256) -> 118 cycles kfree -> 117 cycles 100000 times kmalloc(512) -> 114 cycles kfree -> 116 cycles 100000 times kmalloc(1024) -> 115 cycles kfree -> 118 cycles 100000 times kmalloc(2048) -> 147 cycles kfree -> 131 cycles 100000 times kmalloc(4096) -> 214 cycles kfree -> 161 cycles 2. Kmalloc: alloc/free test 100000 times kmalloc(8)/kfree -> 66 cycles 100000 times kmalloc(16)/kfree -> 66 cycles 100000 times kmalloc(32)/kfree -> 66 cycles 100000 times kmalloc(64)/kfree -> 66 cycles 100000 times kmalloc(128)/kfree -> 65 cycles 100000 times kmalloc(256)/kfree -> 67 cycles 100000 times kmalloc(512)/kfree -> 67 cycles 100000 times kmalloc(1024)/kfree -> 64 cycles 100000 times kmalloc(2048)/kfree -> 67 cycles 100000 times kmalloc(4096)/kfree -> 67 cycles Kernbench, before: Average Optimal load -j 12 Run (std deviation): Elapsed Time 101.873 (1.16069) User Time 1045.22 (1.60447) System Time 88.969 (0.559195) Percent CPU 1112.9 (13.8279) Context Switches 189140 (2282.15) Sleeps 99008.6 (768.091) After: Average Optimal load -j 12 Run (std deviation): Elapsed Time 102.47 (0.562732) User Time 1045.3 (1.34263) System Time 88.311 (0.342554) Percent CPU 1105.8 (6.49444) Context Switches 189081 (2355.78) Sleeps 99231.5 (800.358) This patch (of 2): This commit reorganizes the previous SLAB freelist randomization to prepare for the SLUB implementation. It moves functions that will be shared to slab_common. The entropy functions are changed to align with the SLUB implementation, now using get_random_(int|long) functions. These functions were chosen because they provide a bit more entropy early on boot and better performance when specific arch instructions are not available. [akpm@linux-foundation.org: fix build] Link: http://lkml.kernel.org/r/1464295031-26375-2-git-send-email-thgarnie@google.comSigned-off-by:
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Brian Foster authored
The per-sb inode writeback list tracks inodes currently under writeback to facilitate efficient sync processing. In particular, it ensures that sync only needs to walk through a list of inodes that were cleaned by the sync. Add a couple tracepoints to help identify when inodes are added/removed to and from the writeback lists. Piggyback off of the writeback lazytime tracepoint template as it already tracks the relevant inode information. Link: http://lkml.kernel.org/r/1466594593-6757-3-git-send-email-bfoster@redhat.comSigned-off-by:
Brian Foster <bfoster@redhat.com> Reviewed-by:
Jan Kara <jack@suse.cz> Cc: Dave Chinner <dchinner@redhat.com> cc: Josef Bacik <jbacik@fb.com> Cc: Holger Hoffstätte <holger.hoffstaette@applied-asynchrony.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by:
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Dave Chinner authored
wait_sb_inodes() currently does a walk of all inodes in the filesystem to find dirty one to wait on during sync. This is highly inefficient and wastes a lot of CPU when there are lots of clean cached inodes that we don't need to wait on. To avoid this "all inode" walk, we need to track inodes that are currently under writeback that we need to wait for. We do this by adding inodes to a writeback list on the sb when the mapping is first tagged as having pages under writeback. wait_sb_inodes() can then walk this list of "inodes under IO" and wait specifically just for the inodes that the current sync(2) needs to wait for. Define a couple helpers to add/remove an inode from the writeback list and call them when the overall mapping is tagged for or cleared from writeback. Update wait_sb_inodes() to walk only the inodes under writeback due to the sync. With this change, filesystem sync times are significantly reduced for fs' with largely populated inode caches and otherwise no other work to do. For example, on a 16xcpu 2GHz x86-64 server, 10TB XFS filesystem with a ~10m entry inode cache, sync times are reduced from ~7.3s to less than 0.1s when the filesystem is fully clean. Link: http://lkml.kernel.org/r/1466594593-6757-2-git-send-email-bfoster@redhat.comSigned-off-by:
Dave Chinner <dchinner@redhat.com> Signed-off-by:
Josef Bacik <jbacik@fb.com> Signed-off-by:
Holger Hoffstätte <holger.hoffstaette@applied-asynchrony.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by:
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piaojun authored
Clean up unnecessary assignment for 'ret'. Link: http://lkml.kernel.org/r/578C61F6.4080403@huawei.comSigned-off-by:
Jun Piao <piaojun@huawei.com> Reviewed-by:
Joseph Qi <joseph.qi@huawei.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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Joseph Qi authored
These BUG_ON(!inode) are obscure because we have already used inode to get osb. And actually we can guarantee here inode is valid in the context. So we can safely remove them. Link: http://lkml.kernel.org/r/5776336A.6030104@huawei.comSigned-off-by:
Eric Ren <zren@suse.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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Joseph Qi authored
Several prototypes in inode.h are just defined but not actually implemented and used, so remove them. Link: http://lkml.kernel.org/r/57763787.4020706@huawei.comSigned-off-by:
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Joseph Qi authored
dlm_debug_ctxt->debug_refcnt is initialized to 1 and then increased to 2 by dlm_debug_get in dlm_debug_init. But dlm_debug_put is called only once in dlm_debug_shutdown during unregister dlm, which leads to dlm_debug_ctxt leaked. Link: http://lkml.kernel.org/r/577BB755.4030900@huawei.comSigned-off-by:
Jiufei Xue <xuejiufei@huawei.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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Joseph Qi authored
The last goto is unneeded, so remove it. Link: http://lkml.kernel.org/r/576213D3.6080002@huawei.comSigned-off-by:
Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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Junxiao Bi authored
Journal replay will be run when performing recovery for a dead node. To avoid the stale cache impact, all blocks of dead node's journal inode were reloaded from disk. This hurts the performance. Check whether one block is cached before reloading it can improve performance a lot. In my test env, the time doing recovery was improved from 120s to 1s. [akpm@linux-foundation.org: clean up the for loop p_blkno handling] Link: http://lkml.kernel.org/r/1466155682-24656-1-git-send-email-junxiao.bi@oracle.comSigned-off-by:
Junxiao Bi <junxiao.bi@oracle.com> Reviewed-by:
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Eric Ren authored
Obviously, memset() has zeroed the whole struct locking_max_version. So, it's no need to zero its two fields individually. Link: http://lkml.kernel.org/r/1463970605-18354-1-git-send-email-zren@suse.comSigned-off-by:
Gang He <ghe@suse.com> Cc: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by:
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Randy Dunlap authored
Add ':' to fix trivial kernel-doc warning in <linux/debugobjects.h>: ..//include/linux/debugobjects.h:63: warning: No description found for parameter 'is_static_object' Link: http://lkml.kernel.org/r/575B01B8.5060600@infradead.orgSigned-off-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
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Sudip Mukherjee authored
We are having build failure with m32r and the error message being: ERROR: "__ucmpdi2" [lib/842/842_decompress.ko] undefined! ERROR: "__ucmpdi2" [fs/btrfs/btrfs.ko] undefined! ERROR: "__ucmpdi2" [drivers/scsi/sd_mod.ko] undefined! ERROR: "__ucmpdi2" [drivers/media/i2c/adv7842.ko] undefined! ERROR: "__ucmpdi2" [drivers/md/bcache/bcache.ko] undefined! ERROR: "__ucmpdi2" [drivers/iio/imu/inv_mpu6050/inv-mpu6050.ko] undefined! __ucmpdi2 is introduced to m32r architecture taking example from other architectures like h8300, microblaze, mips. Link: http://lkml.kernel.org/r/1465509213-4280-1-git-send-email-sudipm.mukherjee@gmail.comSigned-off-by:
Sudip Mukherjee <sudip.mukherjee@codethink.co.uk> Signed-off-by:
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Riku Voipio authored
Python divisions are integer divisions unless at least one parameter is a float. The current bloat-o-meter fails to print sub-percentage changes: Total: Before=10515408, After=10604060, chg 0.000000% Force float division by using one float and pretty the print to two significant decimals: Total: Before=10515408, After=10604060, chg +0.84% Link: http://lkml.kernel.org/r/1465980311-23814-1-git-send-email-riku.voipio@linaro.orgSigned-off-by:
Riku Voipio <riku.voipio@linaro.org> Reviewed-by:
Josh Triplett <josh@joshtriplett.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Michal Marek <mmarek@suse.cz> Signed-off-by:
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Kees Cook authored
Before, the stack protector flag was sanity checked before .config had been reprocessed. This meant the build couldn't be aborted early, and only a warning could be emitted followed later by the compiler blowing up with an unknown flag. This has caused a lot of confusion over time, so this splits the flag selection from sanity checking and performs the sanity checking after the make has been restarted from a reprocessed .config, so builds can be aborted as early as possible now. Additionally moves the x86-specific sanity check to the same location, since it suffered from the same warn-then-wait-for-compiler-failure problem. Link: http://lkml.kernel.org/r/20160712223043.GA11664@www.outflux.netSigned-off-by:
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Arnd Bergmann authored
When building with "make W=1", we get a warning about an empty stub function that does nothing but reassign its one of its arguments: drivers/video/fbdev/core/fbmon.c: In function 'fb_edid_to_monspecs': drivers/video/fbdev/core/fbmon.c:1497:67: error: parameter 'specs' set but not used [-Werror=unused-but-set-parameter] We can simply make that function completely empty to avoid the warning. This prevents a warning which everyone will see after "CFLAGS: add -Wunused-but-set-parameter" is merged. Link: http://lkml.kernel.org/r/20160715203229.1771162-1-arnd@arndb.deSigned-off-by:
Arnd Bergmann <arnd@arndb.de> Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Stephen Boyd authored
get_hash_bucket() and put_hash_bucket() acquire and release the same spinlock, but this confuses static checkers such as sparse lib/dma-debug.c:254:27: warning: context imbalance in 'get_hash_bucket' - wrong count at exit lib/dma-debug.c:268:13: warning: context imbalance in 'put_hash_bucket' - unexpected unlock Add the appropriate acquire and release statements so that checkers can properly track the lock state. Link: http://lkml.kernel.org/r/20160701191552.24295-1-sboyd@codeaurora.orgSigned-off-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
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Ross Zwisler authored
Remove the unused wrappers dax_fault() and dax_pmd_fault(). After this removal, rename __dax_fault() and __dax_pmd_fault() to dax_fault() and dax_pmd_fault() respectively, and update all callers. The dax_fault() and dax_pmd_fault() wrappers were initially intended to capture some filesystem independent functionality around page faults (calling sb_start_pagefault() & sb_end_pagefault(), updating file mtime and ctime). However, the following commits: 5726b27b ("ext2: Add locking for DAX faults") ea3d7209 ("ext4: fix races between page faults and hole punching") added locking to the ext2 and ext4 filesystems after these common operations but before __dax_fault() and __dax_pmd_fault() were called. This means that these wrappers are no longer used, and are unlikely to be used in the future. XFS has had locking analogous to what was recently added to ext2 and ext4 since DAX support was initially introduced by: 6b698ede ("xfs: add DAX file operations support") Link: http://lkml.kernel.org/r/20160714214049.20075-2-ross.zwisler@linux.intel.comSigned-off-by:
Ross Zwisler <ross.zwisler@linux.intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Reviewed-by:
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Ross Zwisler authored
These are originally from Matthew Wilcox and were part of his huge "mm,fs,dax: Change ->pmd_fault to ->huge_fault" patch that was part of PUD support. I'm breaking these small changes out as they stand on their own and add useful information to Documentation/filesystems/dax.txt. Link: http://lkml.kernel.org/r/20160714214049.20075-1-ross.zwisler@linux.intel.comSigned-off-by:
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Michal Hocko authored
__GFP_REPEAT has a rather weak semantic but since it has been introduced around 2.6.12 it has been ignored for low order allocations. PGALLOC_GFP uses __GFP_REPEAT but none of the allocation which uses this flag is for more than order-2. This means that this flag has never been actually useful here because it has always been used only for PAGE_ALLOC_COSTLY requests. Link: http://lkml.kernel.org/r/1464599699-30131-5-git-send-email-mhocko@kernel.orgSigned-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull irq updates from Thomas Gleixner: "The irq department delivers: - new core infrastructure to allow better management of multi-queue devices (interrupt spreading, node aware descriptor allocation ...) - a new interrupt flow handler to support the new fangled Intel VMD devices. - yet another new interrupt controller driver. - a series of fixes which addresses sparse warnings, missing includes, missing static declarations etc from Ben Dooks. - a fix for the error handling in the hierarchical domain allocation code. - the usual pile of small updates to core and driver code" * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits) genirq: Fix missing irq allocation affinity hint irqdomain: Fix irq_domain_alloc_irqs_recursive() error handling irq/Documentation: Correct result of echnoing 5 to smp_affinity MAINTAINERS: Remove Jiang Liu from irq domains genirq/msi: Fix broken debug output genirq: Add a helper to spread an affinity mask for MSI/MSI-X vectors genirq/msi: Make use of affinity aware allocations genirq: Use affinity hint in irqdesc allocation genirq: Add affinity hint to irq allocation genirq: Introduce IRQD_AFFINITY_MANAGED flag genirq/msi: Remove unused MSI_FLAG_IDENTITY_MAP irqchip/s3c24xx: Fixup IO accessors for big endian irqchip/exynos-combiner: Fix usage of __raw IO irqdomain: Fix disposal of mappings for interrupt hierarchies irqchip/aspeed-vic: Add irq controller for Aspeed doc/devicetree: Add Aspeed VIC bindings x86/PCI/VMD: Use untracked irq handler genirq: Add untracked irq handler irqchip/mips-gic: Populate irq_domain names irqchip/gicv3-its: Implement two-level(indirect) device table support ... -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer updates from Thomas Gleixner: "This update provides the following changes: - The rework of the timer wheel which addresses the shortcomings of the current wheel (cascading, slow search for next expiring timer, etc). That's the first major change of the wheel in almost 20 years since Finn implemted it. - A large overhaul of the clocksource drivers init functions to consolidate the Device Tree initialization - Some more Y2038 updates - A capability fix for timerfd - Yet another clock chip driver - The usual pile of updates, comment improvements all over the place" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (130 commits) tick/nohz: Optimize nohz idle enter clockevents: Make clockevents_subsys static clocksource/drivers/time-armada-370-xp: Fix return value check timers: Implement optimization for same expiry time in mod_timer() timers: Split out index calculation timers: Only wake softirq if necessary timers: Forward the wheel clock whenever possible timers/nohz: Remove pointless tick_nohz_kick_tick() function timers: Optimize collect_expired_timers() for NOHZ timers: Move __run_timers() function timers: Remove set_timer_slack() leftovers timers: Switch to a non-cascading wheel timers: Reduce the CPU index space to 256k timers: Give a few structs and members proper names hlist: Add hlist_is_singular_node() helper signals: Use hrtimer for sigtimedwait() timers: Remove the deprecated mod_timer_pinned() API timers, net/ipv4/inet: Initialize connection request timers as pinned timers, drivers/tty/mips_ejtag: Initialize the poll timer as pinned timers, drivers/tty/metag_da: Initialize the poll timer as pinned ... -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fix from Ingo Molnar: "Leftover fix from the v4.7 cycle: adds a reboot quirk" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/reboot: Add Dell Optiplex 7450 AIO reboot quirk
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 timer updates from Ingo Molnar: "The main change in this tree is the reworking, fixing and extension of the TSC frequency enumeration code (by Len Brown)" * 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/tsc: Remove the unused check_tsc_disabled() x86/tsc: Enumerate BXT tsc_khz via CPUID x86/tsc: Enumerate SKL cpu_khz and tsc_khz via CPUID x86/tsc_msr: Remove irqoff around MSR-based TSC enumeration x86/tsc_msr: Add Airmont reference clock values x86/tsc_msr: Correct Silvermont reference clock values x86/tsc_msr: Update comments, expand definitions x86/tsc_msr: Remove debugging messages x86/tsc_msr: Identify Intel-specific code Revert "x86/tsc: Add missing Cherrytrail frequency to the table"
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 platform updates from Ingo Molnar: "The main changes in this cycle were: - Intel-SoC enhancements (Andy Shevchenko) - Intel CPU symbolic model definition rework (Dave Hansen) - ... other misc changes" * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (25 commits) x86/sfi: Enable enumeration of SD devices x86/pci: Use MRFLD abbreviation for Merrifield x86/platform/intel-mid: Make vertical indentation consistent x86/platform/intel-mid: Mark regulators explicitly defined x86/platform/intel-mid: Rename mrfl.c to mrfld.c x86/platform/intel-mid: Enable spidev on Intel Edison boards x86/platform/intel-mid: Extend PWRMU to support Penwell x86/pci, x86/platform/intel_mid_pci: Remove duplicate power off code x86/platform/intel-mid: Add pinctrl for Intel Merrifield x86/platform/intel-mid: Enable GPIO expanders on Edison x86/platform/intel-mid: Add Power Management Unit driver x86/platform/atom/punit: Enable support for Merrifield x86/platform/intel_mid_pci: Rework IRQ0 workaround x86, thermal: Clean up and fix CPU model detection for intel_soc_dts_thermal x86, mmc: Use Intel family name macros for mmc driver x86/intel_telemetry: Use Intel family name macros for telemetry driver x86/acpi/lss: Use Intel family name macros for the acpi_lpss driver x86/cpufreq: Use Intel family name macros for the intel_pstate cpufreq driver x86/platform: Use new Intel model number macros x86/intel_idle: Use Intel family macros for intel_idle ...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fpu updates from Ingo Molnar: "The main x86 FPU changes in this cycle were: - a large series of cleanups, fixes and enhancements to re-enable the XSAVES instruction on Intel CPUs - which is the most advanced instruction to do FPU context switches (Yu-cheng Yu, Fenghua Yu) - Add FPU tracepoints for the FPU state machine (Dave Hansen)" * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/fpu: Do not BUG_ON() in early FPU code x86/fpu/xstate: Re-enable XSAVES x86/fpu/xstate: Fix fpstate_init() for XRSTORS x86/fpu/xstate: Return NULL for disabled xstate component address x86/fpu/xstate: Fix __fpu_restore_sig() for XSAVES x86/fpu/xstate: Fix xstate_offsets, xstate_sizes for non-extended xstates x86/fpu/xstate: Fix XSTATE component offset print out x86/fpu/xstate: Fix PTRACE frames for XSAVES x86/fpu/xstate: Fix supervisor xstate component offset x86/fpu/xstate: Align xstate components according to CPUID x86/fpu/xstate: Copy xstate registers directly to the signal frame when compacted format is in use x86/fpu/xstate: Keep init_fpstate.xsave.header.xfeatures as zero for init optimization x86/fpu/xstate: Rename 'xstate_size' to 'fpu_kernel_xstate_size', to distinguish it from 'fpu_user_xstate_size' x86/fpu/xstate: Define and use 'fpu_user_xstate_size' x86/fpu: Add tracepoints to dump FPU state at key points -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 stackdump update from Ingo Molnar: "A number of stackdump enhancements" * 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/dumpstack: Add show_stack_regs() and use it printk: Make the printk*once() variants return a value x86/dumpstack: Honor supplied @regs arg
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 cleanups from Ingo Molnar: "Three small cleanups" * 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: lguest: Read offset of device_cap later lguest: Read length of device_cap later x86: Do away with ARCH_[WANT_OPTIONAL|REQUIRE]_GPIOLIB
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 build updates from Ingo Molnar: "A build system fix and a cleanup" * 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: kbuild: Remove stale asm-generic wrappers kbuild, x86: Track generated headers with generated-y
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 boot updates from Ingo Molnar: "The main changes: - add initial commits to randomize kernel memory section virtual addresses, enabled via a new kernel option: RANDOMIZE_MEMORY (Thomas Garnier, Kees Cook, Baoquan He, Yinghai Lu) - enhance KASLR (RANDOMIZE_BASE) physical memory randomization (Kees Cook) - EBDA/BIOS region boot quirk cleanups (Andy Lutomirski, Ingo Molnar) - misc cleanups/fixes" * 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/boot: Simplify EBDA-vs-BIOS reservation logic x86/boot: Clarify what x86_legacy_features.reserve_bios_regions does x86/boot: Reorganize and clean up the BIOS area reservation code x86/mm: Do not reference phys addr beyond kernel x86/mm: Add memory hotplug support for KASLR memory randomization x86/mm: Enable KASLR for vmalloc memory regions x86/mm: Enable KASLR for physical mapping memory regions x86/mm: Implement ASLR for kernel memory regions x86/mm: Separate variable for trampoline PGD x86/mm: Add PUD VA support for physical mapping x86/mm: Update physical mapping variable names x86/mm: Refactor KASLR entropy functions x86/KASLR: Fix boot crash with certain memory configurations x86/boot/64: Add forgotten end of function marker x86/KASLR: Allow randomization below the load address x86/KASLR: Extend kernel image physical address randomization to addresses larger than 4G x86/KASLR: Randomize virtual address separately x86/KASLR: Clarify identity map interface x86/boot: Refuse to build with data relocations x86/KASLR, x86/power: Remove x86 hibernation restrictions
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- 25 Jul, 2016 7 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 mm updates from Ingo Molnar: "Various x86 low level modifications: - preparatory work to support virtually mapped kernel stacks (Andy Lutomirski) - support for 64-bit __get_user() on 32-bit kernels (Benjamin LaHaise) - (involved) workaround for Knights Landing CPU erratum (Dave Hansen) - MPX enhancements (Dave Hansen) - mremap() extension to allow remapping of the special VDSO vma, for purposes of user level context save/restore (Dmitry Safonov) - hweight and entry code cleanups (Borislav Petkov) - bitops code generation optimizations and cleanups with modern GCC (H. Peter Anvin) - syscall entry code optimizations (Paolo Bonzini)" * 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (43 commits) x86/mm/cpa: Add missing comment in populate_pdg() x86/mm/cpa: Fix populate_pgd(): Stop trying to deallocate failed PUDs x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2 x86/smp: Remove unnecessary initialization of thread_info::cpu x86/smp: Remove stack_smp_processor_id() x86/uaccess: Move thread_info::addr_limit to thread_struct x86/dumpstack: Rename thread_struct::sig_on_uaccess_error to sig_on_uaccess_err x86/uaccess: Move thread_info::uaccess_err and thread_info::sig_on_uaccess_err to thread_struct x86/dumpstack: When OOPSing, rewind the stack before do_exit() x86/mm/64: In vmalloc_fault(), use CR3 instead of current->active_mm x86/dumpstack/64: Handle faults when printing the "Stack: " part of an OOPS x86/dumpstack: Try harder to get a call trace on stack overflow x86/mm: Remove kernel_unmap_pages_in_pgd() and efi_cleanup_page_tables() x86/mm/cpa: In populate_pgd(), don't set the PGD entry until it's populated x86/mm/hotplug: Don't remove PGD entries in remove_pagetable() x86/mm: Use pte_none() to test for empty PTE x86/mm: Disallow running with 32-bit PTEs to work around erratum x86/mm: Ignore A/D bits in pte/pmd/pud_none() x86/mm: Move swap offset/type up in PTE to work around erratum x86/entry: Inline enter_from_user_mode() ... -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86/apic updates from Ingo Molnar: "Misc cleanups and a small fix" * 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/apic: Remove the unused struct apic::apic_id_mask field x86/apic: Fix misspelled APIC x86/ioapic: Simplify ioapic_setup_resources()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull NOHZ updates from Ingo Molnar: - fix system/idle cputime leaked on cputime accounting (all nohz configs) (Rik van Riel) - remove the messy, ad-hoc irqtime account on nohz-full and make it compatible with CONFIG_IRQ_TIME_ACCOUNTING=y instead (Rik van Riel) - cleanups (Frederic Weisbecker) - remove unecessary irq disablement in the irqtime code (Rik van Riel) * 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/cputime: Drop local_irq_save/restore from irqtime_account_irq() sched/cputime: Reorganize vtime native irqtime accounting headers sched/cputime: Clean up the old vtime gen irqtime accounting completely sched/cputime: Replace VTIME_GEN irq time code with IRQ_TIME_ACCOUNTING code sched/cputime: Count actually elapsed irq & softirq time
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler updates from Ingo Molnar: - introduce and use task_rcu_dereference()/try_get_task_struct() to fix and generalize task_struct handling (Oleg Nesterov) - do various per entity load tracking (PELT) fixes and optimizations (Peter Zijlstra) - cputime virt-steal time accounting enhancements/fixes (Wanpeng Li) - introduce consolidated cputime output file cpuacct.usage_all and related refactorings (Zhao Lei) - ... plus misc fixes and enhancements * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/core: Panic on scheduling while atomic bugs if kernel.panic_on_warn is set sched/cpuacct: Introduce cpuacct.usage_all to show all CPU stats together sched/cpuacct: Use loop to consolidate code in cpuacct_stats_show() sched/cpuacct: Merge cpuacct_usage_index and cpuacct_stat_index enums sched/fair: Rework throttle_count sync sched/core: Fix sched_getaffinity() return value kerneldoc comment sched/fair: Reorder cgroup creation code sched/fair: Apply more PELT fixes sched/fair: Fix PELT integrity for new tasks sched/cgroup: Fix cpu_cgroup_fork() handling sched/fair: Fix PELT integrity for new groups sched/fair: Fix and optimize the fork() path sched/cputime: Add steal time support to full dynticks CPU time accounting sched/cputime: Fix prev steal time accouting during CPU hotplug KVM: Fix steal clock warp during guest CPU hotplug sched/debug: Always show 'nr_migrations' sched/fair: Use task_rcu_dereference() sched/api: Introduce task_rcu_dereference() and try_get_task_struct() sched/idle: Optimize the generic idle loop sched/fair: Fix the wrong throttled clock time for cfs_rq_clock_task()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf updates from Ingo Molnar: "With over 300 commits it's been a busy cycle - with most of the work concentrated on the tooling side (as it should). The main kernel side enhancements were: - Add per event callchain limit: Recently we introduced a sysctl to tune the max-stack for all events for which callchains were requested: $ sysctl kernel.perf_event_max_stack kernel.perf_event_max_stack = 127 Now this patch introduces a way to configure this per event, i.e. this becomes possible: $ perf record -e sched:*/max-stack=2/ -e block:*/max-stack=10/ -a allowing finer tuning of how much buffer space callchains use. This uses an u16 from the reserved space at the end, leaving another u16 for future use. There has been interest in even finer tuning, namely to control the max stack for kernel and userspace callchains separately. Further discussion is needed, we may for instance use the remaining u16 for that and when it is present, assume that the sample_max_stack introduced in this patch applies for the kernel, and the u16 left is used for limiting the userspace callchain (Arnaldo Carvalho de Melo) - Optimize AUX event (hardware assisted side-band event) delivery (Kan Liang) - Rework Intel family name macro usage (this is partially x86 arch work) (Dave Hansen) - Refine and fix Intel LBR support (David Carrillo-Cisneros) - Add support for Intel 'TopDown' events (Andi Kleen) - Intel uncore PMU driver fixes and enhancements (Kan Liang) - ... other misc changes. Here's an incomplete list of the tooling enhancements (but there's much more, see the shortlog and the git log for details): - Support cross unwinding, i.e. collecting '--call-graph dwarf' perf.data files in one machine and then doing analysis in another machine of a different hardware architecture. This enables, for instance, to do: $ perf record -a --call-graph dwarf on a x86-32 or aarch64 system and then do 'perf report' on it on a x86_64 workstation (He Kuang) - Allow reading from a backward ring buffer (one setup via sys_perf_event_open() with perf_event_attr.write_backward = 1) (Wang Nan) - Finish merging initial SDT (Statically Defined Traces) support, see cset comments for details about how it all works (Masami Hiramatsu) - Support attaching eBPF programs to tracepoints (Wang Nan) - Add demangling of symbols in programs written in the Rust language (David Tolnay) - Add support for tracepoints in the python binding, including an example, that sets up and parses sched:sched_switch events, tools/perf/python/tracepoint.py (Jiri Olsa) - Introduce --stdio-color to set up the color output mode selection in 'annotate' and 'report', allowing emit color escape sequences when redirecting the output of these tools (Arnaldo Carvalho de Melo) - Add 'callindent' option to 'perf script -F', to indent the Intel PT call stack, making this output more ftrace-like (Adrian Hunter, Andi Kleen) - Allow dumping the object files generated by llvm when processing eBPF scriptlet events (Wang Nan) - Add stackcollapse.py script to help generating flame graphs (Paolo Bonzini) - Add --ldlat option to 'perf mem' to specify load latency for loads event (e.g. cpu/mem-loads/ ) (Jiri Olsa) - Tooling support for Intel TopDown counters, recently added to the kernel (Andi Kleen)" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (303 commits) perf tests: Add is_printable_array test perf tools: Make is_printable_array global perf script python: Fix string vs byte array resolving perf probe: Warn unmatched function filter correctly perf cpu_map: Add more helpers perf stat: Balance opening and reading events tools: Copy linux/{hash,poison}.h and check for drift perf tools: Remove include/linux/list.h from perf's MANIFEST tools: Copy the bitops files accessed from the kernel and check for drift Remove: kernel unistd*h files from perf's MANIFEST, not used perf tools: Remove tools/perf/util/include/linux/const.h perf tools: Remove tools/perf/util/include/asm/byteorder.h perf tools: Add missing linux/compiler.h include to perf-sys.h perf jit: Remove some no-op error handling perf jit: Add missing curly braces objtool: Initialize variable to silence old compiler objtool: Add -I$(srctree)/tools/arch/$(ARCH)/include/uapi perf record: Add --tail-synthesize option perf session: Don't warn about out of order event if write_backward is used perf tools: Enable overwrite settings ... -
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull RAS updates from Ingo Molnar: "The biggest change in this cycle was an enhancement by Yazen Ghannam to reduce the number of MCE error injection related IPIs. The rest are smaller fixes" * 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mce: Fix mce_rdmsrl() warning message x86/RAS/AMD: Reduce the number of IPIs when prepping error injection x86/mce/AMD: Increase size of the bank_map type x86/mce: Do not use bank 1 for APEI generated error logs
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull locking updates from Ingo Molnar: "The locking tree was busier in this cycle than the usual pattern - a couple of major projects happened to coincide. The main changes are: - implement the atomic_fetch_{add,sub,and,or,xor}() API natively across all SMP architectures (Peter Zijlstra) - add atomic_fetch_{inc/dec}() as well, using the generic primitives (Davidlohr Bueso) - optimize various aspects of rwsems (Jason Low, Davidlohr Bueso, Waiman Long) - optimize smp_cond_load_acquire() on arm64 and implement LSE based atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() on arm64 (Will Deacon) - introduce smp_acquire__after_ctrl_dep() and fix various barrier mis-uses and bugs (Peter Zijlstra) - after discovering ancient spin_unlock_wait() barrier bugs in its implementation and usage, strengthen its semantics and update/fix usage sites (Peter Zijlstra) - optimize mutex_trylock() fastpath (Peter Zijlstra) - ... misc fixes and cleanups" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits) locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire() locking/static_keys: Fix non static symbol Sparse warning locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec() locking/atomic, arch/tile: Fix tilepro build locking/atomic, arch/m68k: Remove comment locking/atomic, arch/arc: Fix build locking/Documentation: Clarify limited control-dependency scope locking/atomic, arch/rwsem: Employ atomic_long_fetch_add() locking/atomic, arch/qrwlock: Employ atomic_fetch_add_acquire() locking/atomic, arch/mips: Convert to _relaxed atomics locking/atomic, arch/alpha: Convert to _relaxed atomics locking/atomic: Remove the deprecated atomic_{set,clear}_mask() functions locking/atomic: Remove linux/atomic.h:atomic_fetch_or() locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}() locking/atomic: Fix atomic64_relaxed() bits locking/atomic, arch/xtensa: Implement atomic_fetch_{add,sub,and,or,xor}() locking/atomic, arch/x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() locking/atomic, arch/tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() ...
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