- 19 May, 2013 21 commits
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Stanislaw Gruszka authored
commit 772c808a upstream. Due to rounding in scale_stime(), for big numbers, scaled stime values will grow in chunks. Since rtime grow in jiffies and we calculate utime like below: prev->stime = max(prev->stime, stime); prev->utime = max(prev->utime, rtime - prev->stime); we could erroneously account stime values as utime. To prevent that only update prev->{u,s}time values when they are smaller than current rtime. Signed-off-by:
Stanislaw Gruszka <sgruszka@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: rostedt@goodmis.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Dave Hansen <dave@sr71.net> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1367314507-9728-2-git-send-email-sgruszka@redhat.comSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Stanislaw Gruszka authored
commit 55eaa7c1 upstream. Here is patch, which adds Linus's cputime scaling algorithm to the kernel. This is a follow up (well, fix) to commit d9a3c982 ("sched: Lower chances of cputime scaling overflow") which commit tried to avoid multiplication overflow, but did not guarantee that the overflow would not happen. Linus crated a different algorithm, which completely avoids the multiplication overflow by dropping precision when numbers are big. It was tested by me and it gives good relative error of scaled numbers. Testing method is described here: http://marc.info/?l=linux-kernel&m=136733059505406&w=2 Originally-From: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
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Frederic Weisbecker authored
commit d9a3c982 upstream. Some users have reported that after running a process with hundreds of threads on intensive CPU-bound loads, the cputime of the group started to freeze after a few days. This is due to how we scale the tick-based cputime against the scheduler precise execution time value. We add the values of all threads in the group and we multiply that against the sum of the scheduler exec runtime of the whole group. This easily overflows after a few days/weeks of execution. A proposed solution to solve this was to compute that multiplication on stime instead of utime: 62188451 ("cputime: Avoid multiplication overflow on utime scaling") The rationale behind that was that it's easy for a thread to spend most of its time in userspace under intensive CPU-bound workload but it's much harder to do CPU-bound intensive long run in the kernel. This postulate got defeated when a user recently reported he was still seeing cputime freezes after the above patch. The workload that triggers this issue relates to intensive networking workloads where most of the cputime is consumed in the kernel. To reduce much more the opportunities for multiplication overflow, lets reduce the multiplication factors to the remainders of the division between sched exec runtime and cputime. Assuming the difference between these shouldn't ever be that large, it could work on many situations. This gets the same results as in the upstream scaling code except for a small difference: the upstream code always rounds the results to the nearest integer not greater to what would be the precise result. The new code rounds to the nearest integer either greater or not greater. In practice this difference probably shouldn't matter but it's worth mentioning. If this solution appears not to be enough in the end, we'll need to partly revert back to the behaviour prior to commit 0cf55e1e ("sched, cputime: Introduce thread_group_times()") Back then, the scaling was done on exit() time before adding the cputime of an exiting thread to the signal struct. And then we'll need to scale one-by-one the live threads cputime in thread_group_cputime(). The drawback may be a slightly slower code on exit time. Signed-off-by:
Frederic Weisbecker <fweisbec@gmail.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Frederic Weisbecker authored
commit f7926850 upstream. Provide an extended version of div64_u64() that also returns the remainder of the division. We are going to need this to refine the cputime scaling code. Signed-off-by:
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Wei Yongjun authored
commit fa4d683a upstream. Return -ENOMEM if memory allocation fails in cache_create instead of 0 (to avoid NULL pointer dereference). Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
Alasdair G Kergon <agk@redhat.com> Signed-off-by:
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Wei Yongjun authored
commit 09e8b813 upstream. Return -ENOMEM instead of success if unable to allocate pending exception mempool in snapshot_ctr. Signed-off-by:
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Mikulas Patocka authored
commit 502624bd upstream. This patch uses memalloc_noio_save to avoid a possible deadlock in dm-bufio. (it could happen only with large block size, at most PAGE_SIZE << MAX_ORDER (typically 8MiB). __vmalloc doesn't fully respect gfp flags. The specified gfp flags are used for allocation of requested pages, structures vmap_area, vmap_block and vm_struct and the radix tree nodes. However, the kernel pagetables are allocated always with GFP_KERNEL. Thus the allocation of pagetables can recurse back to the I/O layer and cause a deadlock. This patch uses the function memalloc_noio_save to set per-process PF_MEMALLOC_NOIO flag and the function memalloc_noio_restore to restore it. When this flag is set, all allocations in the process are done with implied GFP_NOIO flag, thus the deadlock can't happen. This should be backported to stable kernels, but they don't have the PF_MEMALLOC_NOIO flag and memalloc_noio_save/memalloc_noio_restore functions. So, PF_MEMALLOC should be set and restored instead. Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
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Mike Snitzer authored
commit d793e684 upstream. Fix a regression in the calculation of the stripe_width in the dm stripe target which led to incorrect processing of device limits. The stripe_width is the stripe device length divided by the number of stripes. The group of commits in the range f14fa693 ("dm stripe: fix size test") to eb850de6 ("dm stripe: support for non power of 2 chunksize") interfered with each other (a merging error) and led to the stripe_width being set incorrectly to the stripe device length divided by chunk_size * stripe_count. For example, a stripe device's table with: 0 33553920 striped 3 512 ... should result in a stripe_width of 11184640 (33553920 / 3), but due to the bug it was getting set to 21845 (33553920 / (512 * 3)). The impact of this bug is that device topologies that previously worked fine with the stripe target are no longer considered valid. In particular, there is a higher risk of seeing this issue if one of the stripe devices has a 4K logical block size. Resulting in an error message like this: "device-mapper: table: 253:4: len=21845 not aligned to h/w logical block size 4096 of dm-1" The fix is to swap the order of the divisions and to use a temporary variable for the second one, so that width retains the intended value. Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Mike Snitzer authored
commit dc019b21 upstream. If device_not_write_same_capable() returns true then the iterate_devices loop in dm_table_supports_write_same() should return false. Reported-by:
Bharata B Rao <bharata.rao@gmail.com> Signed-off-by:
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Viresh Kumar authored
commit 9a188eb1 upstream. In of_dma_controller_register() routine we are calling of_get_property() as an parameter to be32_to_cpup(). In case the property doesn't exist we will get a crash. This patch changes this code to check if we got a valid property first and then runs be32_to_cpup() on it. Signed-off-by:
Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by:
Vinod Koul <vinod.koul@intel.com> Signed-off-by:
Robert Richter <robert.richter@calxeda.com> Signed-off-by:
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Takashi Iwai authored
commit ff359b14 upstream. The older Conexant codecs have up to two EAPDs and these are supposed to be rather statically turned on. The new generic parser code assumes the dynamic on/off per path usage, thus it resulted in the silent output on some machines. This patch fixes the problem by simply assuming the static EAPD on for such old Conexant codecs as we did until 3.8 kernel. Reported-and-tested-by:
Christopher K. <c.krooss@gmail.com> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Signed-off-by:
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Wang YanQing authored
commit 2195b063 upstream. The interrupt handler azx_interrupt will call azx_update_rirb, which may call snd_hda_queue_unsol_event, snd_hda_queue_unsol_event will dereference chip->bus pointer. The problem is we alloc chip->bus in azx_codec_create which will be called after we enable IRQ and enable unsolicited event in azx_probe. This will cause Oops due dereference NULL pointer. I meet it, good luck:) [Rearranged the NULL check before the tracepoint and added another NULL check of bus->workq -- tiwai] Signed-off-by:
Wang YanQing <udknight@gmail.com> Signed-off-by:
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Takashi Iwai authored
commit 6c35ae3c upstream. This reverts commit affdb62b. The commit introduced a regression with AD codecs where the stream is always clean up. Since the patch is just a minor optimization and reverting the commit fixes the issue, let's just revert it. Reported-and-tested-by:
Michael Burian <michael.burian@sbg.at> Signed-off-by:
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Bob Moore authored
commit 61388f9e upstream. Can only happen under these conditions: 1) The DSDT version is 1, meaning integers are 32-bits. 2) The field is between 33 and 64 bits long. It applies cleanly back to ACPICA 20100806+ (Linux v2.6.37+). Signed-off-by:
Bob Moore <robert.moore@intel.com> Signed-off-by:
Lv Zheng <lv.zheng@intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Dan Carpenter authored
commit 4495e46f upstream. The missing break here means that we always return early and the function is a no-op. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by:
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Aaro Koskinen authored
commit e65f131a upstream. Commit 9fdca9df (spi: omap2-mcspi: convert to module_platform_driver) broke the SPI display/panel driver probe on RX-51/N900. The exact cause is not fully understood, but it seems to be related to the probe order. SPI communication to the panel driver (spi1.2) fails unless the touchscreen (spi1.0) has been probed/initialized before. When the omap2-mcspi driver was converted to a platform driver, it resulted in that the devices are probed immediately after the board registers them in the order they are listed in the board file. Fix the issue by moving the touchscreen before the panel in the SPI device list. The patch fixes the following failure: [ 1.260955] acx565akm spi1.2: invalid display ID [ 1.265899] panel-acx565akm display0: acx_panel_probe panel detect error [ 1.273071] omapdss CORE error: driver probe failed: -19 Tested-by:
Sebastian Reichel <sre@debian.org> Signed-off-by:
Aaro Koskinen <aaro.koskinen@iki.fi> Cc: Pali Rohár <pali.rohar@gmail.com> Cc: Joni Lapilainen <joni.lapilainen@gmail.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Felipe Balbi <balbi@ti.com> Signed-off-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
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Fernando Luis Vazquez Cao authored
commit c1e0ac19 upstream. It looks like the manual merge 0d69a3c7 ("Merge branches 'for-3.9/sony' and 'for-3.9/steelseries' into for-linus") accidentally removed Sony RF receiver with USB product id 0x0374 from the "have special driver" list, effectively nullifying a4649184 ("HID: add support for Sony RF receiver with USB product id 0x0374"). Add the device back to the list. Signed-off-by:
Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Signed-off-by:
Jiri Kosina <jkosina@suse.cz> Signed-off-by:
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Paolo Bonzini authored
commit 326f578f upstream. This is an almost-undocumented instruction available in 32-bit mode. I say "almost" undocumented because AMD documents it in their opcode maps just to say that it is unavailable in 64-bit mode (sections "A.2.1 One-Byte Opcodes" and "B.3 Invalid and Reassigned Instructions in 64-Bit Mode"). It is roughly equivalent to "sbb %al, %al" except it does not set the flags. Use fastop to emulate it, but do not use the opcode directly because it would fail if the host is 64-bit! Reported-by:
Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
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Paolo Bonzini authored
commit 7fa57952 upstream. This is used by SGABIOS, KVM breaks with emulate_invalid_guest_state=1. It is just a MOV in disguise, with a funny source address. Reported-by:
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Paolo Bonzini authored
commit a035d5c6 upstream. This is used by SGABIOS, KVM breaks with emulate_invalid_guest_state=1. AAM needs the source operand to be unsigned; do the same in AAD as well for consistency, even though it does not affect the result. Reported-by:
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Gleb Natapov authored
commit 8d76c49e upstream. The invalid guest state emulation loop does not check halt_request which causes 100% cpu loop while guest is in halt and in invalid state, but more serious issue is that this leaves halt_request set, so random instruction emulated by vm86 #GP exit can be interpreted as halt which causes guest hang. Fix both problems by handling halt_request in emulation loop. Reported-by:
Tomas Papan <tomas.papan@gmail.com> Tested-by:
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- 11 May, 2013 19 commits
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Greg Kroah-Hartman authored
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Chen Gang authored
commit 12b2f117 upstream. audit_trim_trees() calls get_tree(). If a failure occurs we must call put_tree(). [akpm@linux-foundation.org: run put_tree() before mutex_lock() for small scalability improvement] Signed-off-by:
Chen Gang <gang.chen@asianux.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Paris <eparis@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by:
Jonghwan Choi <jhbird.choi@samsung.com> Signed-off-by:
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Trond Myklebust authored
commit c5a2a15f upstream. If a NFS client receives a delegation for a file after it has taken a lock on that file, we can currently end up in a situation where we mistakenly skip unlocking that file. The following patch swaps an erroneous check in nfs4_proc_unlck for whether or not the file has a delegation to one which checks whether or not we hold a lock stateid for that file. Reported-by:
Chuck Lever <Chuck.Lever@oracle.com> Signed-off-by:
Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by:
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Dan Williams authored
commit 7fdb7846 upstream. A rebranded Novatel E371 for AT&T's LTE bands. qmi_wwan should drive this device, while cdc_ether should ignore it. Even though the USB descriptors are plain CDC-ETHER that USB interface is a QMI interface. Signed-off-by:
Dan Williams <dcbw@redhat.com> Acked-by:
Bjørn Mork <bjorn@mork.no> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Yinghai Lu authored
commit e253aaf0 upstream. Commit 4f535093 "PCI: Put pci_dev in device tree as early as possible" moved final fixups from pci_bus_add_device() to pci_device_add(). But pci_device_add() happens before resource assignment, so BARs may not be valid yet. Typical flow for hot-add: pciehp_configure_device pci_scan_slot pci_scan_single_device pci_device_add pci_fixup_device(pci_fixup_final, dev) # previous location # resource assignment happens here pci_bus_add_devices pci_bus_add_device pci_fixup_device(pci_fixup_final, dev) # new location [bhelgaas: changelog, move fixups to pci_bus_add_device()] Reference: https://lkml.kernel.org/r/20130415182614.GB9224@xanatosReported-by:
David Bulkow <David.Bulkow@stratus.com> Tested-by:
Yinghai Lu <yinghai@kernel.org> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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Srivatsa S. Bhat authored
commit c8c64d16 upstream. I get the following warning on boot: ------------[ cut here ]------------ WARNING: at drivers/base/core.c:575 device_create_file+0x9a/0xa0() Hardware name: -[8737R2A]- Write permission without 'store' ... </snip> Drilling down, this is related to dynamic channel ce_count attribute files sporting a S_IWUSR mode without a ->store() function. Looking around, it appears that they aren't supposed to have a ->store() function. So remove the bogus write permission to get rid of the warning. Signed-off-by:
Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Mauro Carvalho Chehab <mchehab@redhat.com> [ shorten commit message ] Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
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Josef Bacik authored
commit eb384b55 upstream. This is the same as the fix from commit Btrfs: fix bad extent logging but for O_DIRECT. I missed this when I fixed the problem originally, we were still using the em for the orig_start and orig_block_len, which would be the merged extent. We need to use the actual extent from the on disk file extent item, which we have to lookup to make sure it's ok to nocow anyway so just pass in some pointers to hold this info. Thanks, Signed-off-by:
Josef Bacik <jbacik@fusionio.com> Signed-off-by:
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Josef Bacik authored
commit 41b0fc42 upstream. A user reported a panic while running a balance. What was happening was he was relocating a block, which added the reference to the relocation tree. Then relocation would walk through the relocation tree and drop that reference and free that block, and then it would walk down a snapshot which referenced the same block and add another ref to the block. The problem is this was all happening in the same transaction, so the parent block was free'ed up when we drop our reference which was immediately available for allocation, and then it was used _again_ to add a reference for the same block from a different snapshot. This resulted in something like this in the delayed ref tree add ref to 90234880, parent=2067398656, ref_root 1766, level 1 del ref to 90234880, parent=2067398656, ref_root 18446744073709551608, level 1 add ref to 90234880, parent=2067398656, ref_root 1767, level 1 as you can see the ref_root's don't match, because when we inc the ref we use the header owner, which is the original tree the block belonged to, instead of the data reloc tree. Then when we remove the extent we use the reloc tree objectid. But none of this matters, since it is a shared reference which means only the parent matters. When the delayed ref stuff runs it adds all the increments first, and then does all the drops, to make sure that we don't delete the ref if we net a positive ref count. But tree blocks aren't allowed to have multiple refs from the same block, so this panics when it tries to add the second ref. We need the add and the drop to cancel each other out in memory so we only do the final add. So to fix this we need to adjust how the delayed refs are added to the tree. Only the ref_root matters when it is a normal backref, and only the parent matters when it is a shared backref. So make our decision based on what ref type we have. This allows us to keep the ref_root in memory in case anybody wants to use it for something else, and it allows the delayed refs to be merged properly so we don't end up with this panic. With this patch the users image no longer panics on mount, and it has a clean fsck after a normal mount/umount cycle. Thanks, Reported-by:
Roman Mamedov <rm@romanrm.ru> Signed-off-by:
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Steven Rostedt (Red Hat) authored
commit 7fe70b57 upstream. ftrace_dump() had a lot of issues. What ftrace_dump() does, is when ftrace_dump_on_oops is set (via a kernel parameter or sysctl), it will dump out the ftrace buffers to the console when either a oops, panic, or a sysrq-z occurs. This was written a long time ago when ftrace was fragile to recursion. But it wasn't written well even for that. There's a possible deadlock that can occur if a ftrace_dump() is happening and an NMI triggers another dump. This is because it grabs a lock before checking if the dump ran. It also totally disables ftrace, and tracing for no good reasons. As the ring_buffer now checks if it is read via a oops or NMI, where there's a chance that the buffer gets corrupted, it will disable itself. No need to have ftrace_dump() do the same. ftrace_dump() is now cleaned up where it uses an atomic counter to make sure only one dump happens at a time. A simple atomic_inc_return() is enough that is needed for both other CPUs and NMIs. No need for a spinlock, as if one CPU is running the dump, no other CPU needs to do it too. The tracing_on variable is turned off and not turned on. The original code did this, but it wasn't pretty. By just disabling this variable we get the result of not seeing traces that happen between crashes. For sysrq-z, it doesn't get turned on, but the user can always write a '1' to the tracing_on file. If they are using sysrq-z, then they should know about tracing_on. The new code is much easier to read and less error prone. No more deadlock possibility when an NMI triggers here. Reported-by:
zhangwei(Jovi) <jovi.zhangwei@huawei.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
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Sachin Kamat authored
commit 9e48854c upstream. Instead of checking if num_encoders is zero, it is being assigned 0. Convert the assignment to a check. Signed-off-by:
Sachin Kamat <sachin.kamat@linaro.org> Acked-by:
Rob Clark <robdclark@gmail.com> Signed-off-by:
Dave Airlie <airlied@redhat.com> Signed-off-by:
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Alex Deucher authored
commit 441e76ca upstream. The code was mis-handling variable sized arrays. Reported-by:
Sylvain BERTRAND <sylware@legeek.net> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Alex Deucher authored
commit 62d1f92e upstream. Signed-off-by:
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Alex Deucher authored
commit f8e6bfc2 upstream. If we have a empty power table, bail early and allocate the default power state. Should fix: https://bugs.freedesktop.org/show_bug.cgi?id=63865Signed-off-by:
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Alex Deucher authored
commit beb71fc6 upstream. Reviwed-by:
Michel Dänzer <michel.daenzer@amd.com> Signed-off-by:
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Alex Deucher authored
commit e884fc64 upstream. Just disabling the mem requests should be enough, but that doesn't seem to work correctly on efi systems. v2: blank displays first, then disable. Signed-off-by:
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Jerome Glisse authored
commit 466476df upstream. This is slightly cleaned up version of Jerome's patch. There seems to be an issue tracking the last flush of the VM which results in hangs in certain cases when VM is used. For now just flush the VM for every IB. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=62959 https://bugs.freedesktop.org/show_bug.cgi?id=62997Signed-off-by:
Jerome Glisse <jglisse@redhat.com> Reviewed-by:
Christian König <christian.koenig@amd.com> Signed-off-by:
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Alex Deucher authored
commit 79b52d6a upstream. Signed-off-by:
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Alex Deucher authored
commit dcb85290 upstream. These chips were previously skipped since they are pre-R600. Signed-off-by:
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Alex Deucher authored
commit 0cd9cb76 upstream. If we fail to map the mmio BAR, skip driver tear down that requires mmio. Should fix: https://bugzilla.kernel.org/show_bug.cgi?id=56541Signed-off-by:
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