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  1. 27 Aug, 2014 2 commits
    • Milosz Tanski's avatar
      FS-Cache: Reduce cookie ref count if submit fails. · 920bce20
      Milosz Tanski authored 
      I've been seeing issues with disposing cookies under vma pressure. The symptom
is that the refcount gets out of sync. In this case we fail to decrement the
refcount if submit fails. I found this while auditing the error in and around
cookie operations.
Signed-off-by: default avatarMilosz Tanski <milosz@adfin.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      920bce20
    • Milosz Tanski's avatar
      FS-Cache: Timeout for releasepage() · 9776de96
      Milosz Tanski authored 
      This is meant to avoid a recusive hang caused by underlying filesystem trying
to grab a free page and causing a write-out.

INFO: task kworker/u30:7:28375 blocked for more than 120 seconds.
      Not tainted 3.15.0-virtual #74
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u30:7   D 0000000000000000     0 28375      2 0x00000000
Workqueue: fscache_operation fscache_op_work_func [fscache]
 ffff88000b147148 0000000000000046 0000000000000000 ffff88000b1471c8
 ffff8807aa031820 0000000000014040 ffff88000b147fd8 0000000000014040
 ffff880f0c50c860 ffff8807aa031820 ffff88000b147158 ffff88007be59cd0
Call Trace:
 [<ffffffff815930e9>] schedule+0x29/0x70
 [<ffffffffa018bed5>] __fscache_wait_on_page_write+0x55/0x90 [fscache]
 [<ffffffff810a4350>] ? __wake_up_sync+0x20/0x20
 [<ffffffffa018c135>] __fscache_maybe_release_page+0x65/0x1e0 [fscache]
 [<ffffffffa02ad813>] ceph_releasepage+0x83/0x100 [ceph]
 [<ffffffff811635b0>] ? anon_vma_fork+0x130/0x130
 [<ffffffff8112cdd2>] try_to_release_page+0x32/0x50
 [<ffffffff81140096>] shrink_page_list+0x7e6/0x9d0
 [<ffffffff8113f278>] ? isolate_lru_pages.isra.73+0x78/0x1e0
 [<ffffffff81140932>] shrink_inactive_list+0x252/0x4c0
 [<ffffffff811412b1>] shrink_lruvec+0x3e1/0x670
 [<ffffffff8114157f>] shrink_zone+0x3f/0x110
 [<ffffffff81141b06>] do_try_to_free_pages+0x1d6/0x450
 [<ffffffff8114a939>] ? zone_statistics+0x99/0xc0
 [<ffffffff81141e44>] try_to_free_pages+0xc4/0x180
 [<ffffffff81136982>] __alloc_pages_nodemask+0x6b2/0xa60
 [<ffffffff811c1d4e>] ? __find_get_block+0xbe/0x250
 [<ffffffff810a405e>] ? wake_up_bit+0x2e/0x40
 [<ffffffff811740c3>] alloc_pages_current+0xb3/0x180
 [<ffffffff8112cf07>] __page_cache_alloc+0xb7/0xd0
 [<ffffffff8112da6c>] grab_cache_page_write_begin+0x7c/0xe0
 [<ffffffff81214072>] ? ext4_mark_inode_dirty+0x82/0x220
 [<ffffffff81214a89>] ext4_da_write_begin+0x89/0x2d0
 [<ffffffff8112c6ee>] generic_perform_write+0xbe/0x1d0
 [<ffffffff811a96b1>] ? update_time+0x81/0xc0
 [<ffffffff811ad4c2>] ? mnt_clone_write+0x12/0x30
 [<ffffffff8112e80e>] __generic_file_aio_write+0x1ce/0x3f0
 [<ffffffff8112ea8e>] generic_file_aio_write+0x5e/0xe0
 [<ffffffff8120b94f>] ext4_file_write+0x9f/0x410
 [<ffffffff8120af56>] ? ext4_file_open+0x66/0x180
 [<ffffffff8118f0da>] do_sync_write+0x5a/0x90
 [<ffffffffa025c6c9>] cachefiles_write_page+0x149/0x430 [cachefiles]
 [<ffffffff812cf439>] ? radix_tree_gang_lookup_tag+0x89/0xd0
 [<ffffffffa018c512>] fscache_write_op+0x222/0x3b0 [fscache]
 [<ffffffffa018b35a>] fscache_op_work_func+0x3a/0x100 [fscache]
 [<ffffffff8107bfe9>] process_one_work+0x179/0x4a0
 [<ffffffff8107d47b>] worker_thread+0x11b/0x370
 [<ffffffff8107d360>] ? manage_workers.isra.21+0x2e0/0x2e0
 [<ffffffff81083d69>] kthread+0xc9/0xe0
 [<ffffffff81010000>] ? ftrace_raw_event_xen_mmu_release_ptpage+0x70/0x90
 [<ffffffff81083ca0>] ? flush_kthread_worker+0xb0/0xb0
 [<ffffffff8159eefc>] ret_from_fork+0x7c/0xb0
 [<ffffffff81083ca0>] ? flush_kthread_worker+0xb0/0xb0
Signed-off-by: default avatarMilosz Tanski <milosz@adfin.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      9776de96
  3. 26 Aug, 2014 3 commits
  5. 25 Aug, 2014 5 commits
    • Linus Torvalds's avatar
      Linux 3.17-rc2 · 52addcf9
      Linus Torvalds authored
      52addcf9
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-3.17-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs · f01bfc97
      Linus Torvalds authored 
      Pull NFS client fixes from Trond Myklebust:
 "Highlights:

   - more fixes for read/write codepath regressions
     * sleeping while holding the inode lock
     * stricter enforcement of page contiguity when coalescing requests
     * fix up error handling in the page coalescing code

   - don't busy wait on SIGKILL in the file locking code"

* tag 'nfs-for-3.17-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  nfs: Don't busy-wait on SIGKILL in __nfs_iocounter_wait
  nfs: can_coalesce_requests must enforce contiguity
  nfs: disallow duplicate pages in pgio page vectors
  nfs: don't sleep with inode lock in lock_and_join_requests
  nfs: fix error handling in lock_and_join_requests
  nfs: use blocking page_group_lock in add_request
  nfs: fix nonblocking calls to nfs_page_group_lock
  nfs: change nfs_page_group_lock argument
      f01bfc97
    • Linus Torvalds's avatar
      Merge tag 'renesas-sh-drivers-for-v3.17' of... · dd5957b7
      Linus Torvalds authored 
      Merge tag 'renesas-sh-drivers-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas

Pull SH driver fix from Simon Horman:
 "Confine SH_INTC to platforms that need it"

* tag 'renesas-sh-drivers-for-v3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  sh: intc: Confine SH_INTC to platforms that need it
      dd5957b7
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 497c01dd
      Linus Torvalds authored 
      Pull MIPS fixes from Ralf Baechle:
 "Pretty much all across the field so with this we should be in
  reasonable shape for the upcoming -rc2"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: OCTEON: make get_system_type() thread-safe
  MIPS: CPS: Initialize EVA before bringing up VPEs from secondary cores
  MIPS: Malta: EVA: Rename 'eva_entry' to 'platform_eva_init'
  MIPS: EVA: Add new EVA header
  MIPS: scall64-o32: Fix indirect syscall detection
  MIPS: syscall: Fix AUDIT value for O32 processes on MIPS64
  MIPS: Loongson: Fix COP2 usage for preemptible kernel
  MIPS: NL: Fix nlm_xlp_defconfig build error
  MIPS: Remove race window in page fault handling
  MIPS: Malta: Improve system memory detection for '{e, }memsize' >= 2G
  MIPS: Alchemy: Fix db1200 PSC clock enablement
  MIPS: BCM47XX: Fix reboot problem on BCM4705/BCM4785
  MIPS: Remove duplicated include from numa.c
  MIPS: Add common plat_irq_dispatch declaration
  MIPS: MSP71xx: remove unused plat_irq_dispatch() argument
  MIPS: GIC: Remove useless parens from GICBIS().
  MIPS: perf: Mark pmu interupt IRQF_NO_THREAD
      497c01dd
    • Linus Torvalds's avatar
      Merge tag 'trace-fixes-v3.17-rc1' of... · 01e9982a
      Linus Torvalds authored 
      Merge tag 'trace-fixes-v3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull fix for ftrace function tracer/profiler conflict from Steven Rostedt:
 "The rewrite of the ftrace code that makes it possible to allow for
  separate trampolines had a design flaw with the interaction between
  the function and function_graph tracers.

  The main flaw was the simplification of the use of multiple tracers
  having the same filter (like function and function_graph, that use the
  set_ftrace_filter file to filter their code).  The design assumed that
  the two tracers could never run simultaneously as only one tracer can
  be used at a time.  The problem with this assumption was that the
  function profiler could be implemented on top of the function graph
  tracer, and the function profiler could run at the same time as the
  function tracer.  This caused the assumption to be broken and when
  ftrace detected this failed assumpiton it would spit out a nasty
  warning and shut itself down.

  Instead of using a single ftrace_ops that switches between the
  function and function_graph callbacks, the two tracers can again use
  their own ftrace_ops.  But instead of having a complex hierarchy of
  ftrace_ops, the filter fields are placed in its own structure and the
  ftrace_ops can carefully use the same filter.  This change took a bit
  to be able to allow for this and currently only the global_ops can
  share the same filter, but this new design can easily be modified to
  allow for any ftrace_ops to share its filter with another ftrace_ops.

  The first four patches deal with the change of allowing the ftrace_ops
  to share the filter (and this needs to go to 3.16 as well).

  The fifth patch fixes a bug that was also caused by the new changes
  but only for archs other than x86, and only if those archs implement a
  direct call to the function_graph tracer which they do not do yet but
  will in the future.  It does not need to go to stable, but needs to be
  fixed before the other archs update their code to allow direct calls
  to the function_graph trampoline"

* tag 'trace-fixes-v3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Use current addr when converting to nop in __ftrace_replace_code()
  ftrace: Fix function_profiler and function tracer together
  ftrace: Fix up trampoline accounting with looping on hash ops
  ftrace: Update all ftrace_ops for a ftrace_hash_ops update
  ftrace: Allow ftrace_ops to use the hashes from other ops
      01e9982a
  7. 24 Aug, 2014 12 commits
  9. 23 Aug, 2014 5 commits
    • Heiko Stuebner's avatar
      MAINTAINERS: add new Rockchip SoC list · 00250b52
      Heiko Stuebner authored 
      Add the new list that Rockchip-specific patches should also be directed to.
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
      00250b52
    • Heiko Stuebner's avatar
      ARM: dts: rockchip: readd missing mmc0 pinctrl settings · 1302d32c
      Heiko Stuebner authored 
      During the restructuring of the Rockchip Cortex-A9 dtsi files it seems
like the pinctrl settings vanished at some point from the mmc0 support.

This of course renders them unusable, so readd the necessary pinctrl
properties.
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
      1302d32c
    • Olof Johansson's avatar
      Merge tag 'sunxi-dt-for-3.17-2' of... · 2136edf3
      Olof Johansson authored 
      Merge tag 'sunxi-dt-for-3.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into fixes

Merge "Allwinner DT changes, take 2" from Maxime Ripard:

Only a single patch in here that fixes a DTC warning.

* tag 'sunxi-dt-for-3.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
  ARM: dt: sun6i: Add #address-cells and #size-cells to i2c controller nodes
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
      2136edf3
    • Steven Rostedt (Red Hat)'s avatar
      ftrace: Use current addr when converting to nop in __ftrace_replace_code() · 39b5552c
      Steven Rostedt (Red Hat) authored 
      In __ftrace_replace_code(), when converting the call to a nop in a function
it needs to compare against the "curr" (current) value of the ftrace ops, and
not the "new" one. It currently does not affect x86 which is the only arch
to do the trampolines with function graph tracer, but when other archs that do
depend on this code implement the function graph trampoline, it can crash.

Here's an example when ARM uses the trampolines (in the future):

 ------------[ cut here ]------------
 WARNING: CPU: 0 PID: 9 at kernel/trace/ftrace.c:1716 ftrace_bug+0x17c/0x1f4()
 Modules linked in: omap_rng rng_core ipv6
 CPU: 0 PID: 9 Comm: migration/0 Not tainted 3.16.0-test-10959-gf0094b28-dirty #52
 [<c02188f4>] (unwind_backtrace) from [<c021343c>] (show_stack+0x20/0x24)
 [<c021343c>] (show_stack) from [<c095a674>] (dump_stack+0x78/0x94)
 [<c095a674>] (dump_stack) from [<c02532a0>] (warn_slowpath_common+0x7c/0x9c)
 [<c02532a0>] (warn_slowpath_common) from [<c02532ec>] (warn_slowpath_null+0x2c/0x34)
 [<c02532ec>] (warn_slowpath_null) from [<c02cbac4>] (ftrace_bug+0x17c/0x1f4)
 [<c02cbac4>] (ftrace_bug) from [<c02cc44c>] (ftrace_replace_code+0x80/0x9c)
 [<c02cc44c>] (ftrace_replace_code) from [<c02cc658>] (ftrace_modify_all_code+0xb8/0x164)
 [<c02cc658>] (ftrace_modify_all_code) from [<c02cc718>] (__ftrace_modify_code+0x14/0x1c)
 [<c02cc718>] (__ftrace_modify_code) from [<c02c7244>] (multi_cpu_stop+0xf4/0x134)
 [<c02c7244>] (multi_cpu_stop) from [<c02c6e90>] (cpu_stopper_thread+0x54/0x130)
 [<c02c6e90>] (cpu_stopper_thread) from [<c0271cd4>] (smpboot_thread_fn+0x1ac/0x1bc)
 [<c0271cd4>] (smpboot_thread_fn) from [<c026ddf0>] (kthread+0xe0/0xfc)
 [<c026ddf0>] (kthread) from [<c020f318>] (ret_from_fork+0x14/0x20)
 ---[ end trace dc9ce72c5b617d8f ]---
[   65.047264] ftrace failed to modify [<c0208580>] asm_do_IRQ+0x10/0x1c
[   65.054070]  actual: 85:1b:00:eb

Fixes: 7413af1f "ftrace: Make get_ftrace_addr() and get_ftrace_addr_old() global"
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      39b5552c
    • Steven Rostedt (Red Hat)'s avatar
      ftrace: Fix function_profiler and function tracer together · 5f151b24
      Steven Rostedt (Red Hat) authored 
      The latest rewrite of ftrace removed the separate ftrace_ops of
the function tracer and the function graph tracer and had them
share the same ftrace_ops. This simplified the accounting by removing
the multiple layers of functions called, where the global_ops func
would call a special list that would iterate over the other ops that
were registered within it (like function and function graph), which
itself was registered to the ftrace ops list of all functions
currently active. If that sounds confusing, the code that implemented
it was also confusing and its removal is a good thing.

The problem with this change was that it assumed that the function
and function graph tracer can never be used at the same time.
This is mostly true, but there is an exception. That is when the
function profiler uses the function graph tracer to profile.
The function profiler can be activated the same time as the function
tracer, and this breaks the assumption and the result is that ftrace
will crash (it detects the error and shuts itself down, it does not
cause a kernel oops).

To solve this issue, a previous change allowed the hash tables
for the functions traced by a ftrace_ops to be a pointer and let
multiple ftrace_ops share the same hash. This allows the function
and function_graph tracer to have separate ftrace_ops, but still
share the hash, which is what is done.

Now the function and function graph tracers have separate ftrace_ops
again, and the function tracer can be run while the function_profile
is active.

Cc: stable@vger.kernel.org # 3.16 (apply after 3.17-rc4 is out)
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      5f151b24
  11. 22 Aug, 2014 13 commits
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