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  1. 30 Sep, 2016 6 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · dbd8805b
      Linus Torvalds authored 
      Merge more fixes from Andrew Morton:
 "Three fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  include/linux/property.h: fix typo/compile error
  ocfs2: fix deadlock on mmapped page in ocfs2_write_begin_nolock()
  mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()
      dbd8805b
    • John Youn's avatar
      include/linux/property.h: fix typo/compile error · 37aa7271
      John Youn authored 
      This fixes commit d76eebfa ("include/linux/property.h: fix build
issues with gcc-4.4.4").

With that commit we get the following compile error when using the
PROPERTY_ENTRY_INTEGER_ARRAY macro.

 include/linux/property.h:201:39: error: `u32_data' undeclared (first
                 use in this function)
  PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
                                       ^
 include/linux/property.h:193:17: note: in definition of macro
                 `PROPERTY_ENTRY_INTEGER_ARRAY'
  { .pointer = { _type_##_data = _val_ } },  \
                 ^

This needs a '.' to reference the union member.  It seems this was just
overlooked here since it is done correctly in similar constructs in
other parts of the original commit.

This fix is in preparation of upcoming commits that will use this macro.

Fixes: commit d76eebfa ("include/linux/property.h: fix build issues with gcc-4.4.4")
Link: http://lkml.kernel.org/r/2de3b929290d88a723ed829a3e3cbd02044714df.1475114627.git.johnyoun@synopsys.comSigned-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      37aa7271
    • Eric Ren's avatar
      ocfs2: fix deadlock on mmapped page in ocfs2_write_begin_nolock() · c33f0785
      Eric Ren authored 
      The testcase "mmaptruncate" of ocfs2-test deadlocks occasionally.

In this testcase, we create a 2*CLUSTER_SIZE file and mmap() on it;
there are 2 process repeatedly performing the following operations
respectively: one is doing memset(mmaped_addr + 2*CLUSTER_SIZE - 1, 'a',
1), while the another is playing ftruncate(fd, 2*CLUSTER_SIZE) and then
ftruncate(fd, CLUSTER_SIZE) again and again.

This is the backtrace when the deadlock happens:

   __wait_on_bit_lock+0x50/0xa0
   __lock_page+0xb7/0xc0
   ocfs2_write_begin_nolock+0x163f/0x1790 [ocfs2]
   ocfs2_page_mkwrite+0x1c7/0x2a0 [ocfs2]
   do_page_mkwrite+0x66/0xc0
   handle_mm_fault+0x685/0x1350
   __do_page_fault+0x1d8/0x4d0
   trace_do_page_fault+0x37/0xf0
   do_async_page_fault+0x19/0x70
   async_page_fault+0x28/0x30

In ocfs2_write_begin_nolock(), we first grab the pages and then allocate
disk space for this write; ocfs2_try_to_free_truncate_log() will be
called if -ENOSPC is returned; if we're lucky to get enough clusters,
which is usually the case, we start over again.

But in ocfs2_free_write_ctxt() the target page isn't unlocked, so we
will deadlock when trying to grab the target page again.

Also, -ENOMEM might be returned in ocfs2_grab_pages_for_write().
Another deadlock will happen in __do_page_mkwrite() if
ocfs2_page_mkwrite() returns non-VM_FAULT_LOCKED, and along with a
locked target page.

These two errors fail on the same path, so fix them by unlocking the
target page manually before ocfs2_free_write_ctxt().

Jan Kara helps me clear out the JBD2 part, and suggest the hint for root
cause.

Changes since v1:
1. Also put ENOMEM error case into consideration.

Link: http://lkml.kernel.org/r/1474173902-32075-1-git-send-email-zren@suse.comSigned-off-by: default avatarEric Ren <zren@suse.com>
Reviewed-by: default avatarHe Gang <ghe@suse.com>
Acked-by: default avatarJoseph 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c33f0785
    • Johannes Weiner's avatar
      mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page() · 22f2ac51
      Johannes Weiner authored 
      Antonio reports the following crash when using fuse under memory pressure:

  kernel BUG at /build/linux-a2WvEb/linux-4.4.0/mm/workingset.c:346!
  invalid opcode: 0000 [#1] SMP
  Modules linked in: all of them
  CPU: 2 PID: 63 Comm: kswapd0 Not tainted 4.4.0-36-generic #55-Ubuntu
  Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 3904 04/27/2013
  task: ffff88040cae6040 ti: ffff880407488000 task.ti: ffff880407488000
  RIP: shadow_lru_isolate+0x181/0x190
  Call Trace:
    __list_lru_walk_one.isra.3+0x8f/0x130
    list_lru_walk_one+0x23/0x30
    scan_shadow_nodes+0x34/0x50
    shrink_slab.part.40+0x1ed/0x3d0
    shrink_zone+0x2ca/0x2e0
    kswapd+0x51e/0x990
    kthread+0xd8/0xf0
    ret_from_fork+0x3f/0x70

which corresponds to the following sanity check in the shadow node
tracking:

  BUG_ON(node->count & RADIX_TREE_COUNT_MASK);

The workingset code tracks radix tree nodes that exclusively contain
shadow entries of evicted pages in them, and this (somewhat obscure)
line checks whether there are real pages left that would interfere with
reclaim of the radix tree node under memory pressure.

While discussing ways how fuse might sneak pages into the radix tree
past the workingset code, Miklos pointed to replace_page_cache_page(),
and indeed there is a problem there: it properly accounts for the old
page being removed - __delete_from_page_cache() does that - but then
does a raw raw radix_tree_insert(), not accounting for the replacement
page.  Eventually the page count bits in node->count underflow while
leaving the node incorrectly linked to the shadow node LRU.

To address this, make sure replace_page_cache_page() uses the tracked
page insertion code, page_cache_tree_insert().  This fixes the page
accounting and makes sure page-containing nodes are properly unlinked
from the shadow node LRU again.

Also, make the sanity checks a bit less obscure by using the helpers for
checking the number of pages and shadows in a radix tree node.

Fixes: 449dd698 ("mm: keep page cache radix tree nodes in check")
Link: http://lkml.kernel.org/r/20160919155822.29498-1-hannes@cmpxchg.orgSigned-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Reported-by: default avatarAntonio SJ Musumeci <trapexit@spawn.link>
Debugged-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Cc: <stable@vger.kernel.org>	[3.15+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      22f2ac51
    • Javi Merino's avatar
      MAINTAINERS: Switch to kernel.org email address for Javi Merino · 9a2172a8
      Javi Merino authored 
      Change my email address to my kernel.org account instead of the ARM one.
Signed-off-by: default avatarJavi Merino <javi.merino@arm.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9a2172a8
    • Linus Torvalds's avatar
      Merge tag 'drm-fixes-for-v4.8-final' of git://people.freedesktop.org/~airlied/linux · e3b3656c
      Linus Torvalds authored 
      Pull drm fixes from Dave Airlie:
 "drm fixes for final 4.8.

  One big regression fix for udl, along with two amdgpu fixes and two
  nouveau fixes.

  All seems pretty safe and useful"

* tag 'drm-fixes-for-v4.8-final' of git://people.freedesktop.org/~airlied/linux:
  drm/udl: fix line iterator in damage handling
  drm/radeon/si/dpm: add workaround for for Jet parts
  drm/amdgpu: disable CRTCs before teardown
  drm/nouveau: Revert "bus: remove cpu_coherent flag"
  drm/nouveau/fifo/nv04: avoid ramht race against cookie insertion
      e3b3656c
  3. 29 Sep, 2016 1 commit
    • Linus Torvalds's avatar
      Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · c6169de7
      Linus Torvalds authored 
      Pull libnvdimm fixes from Dan Williams:

 - Four fixes for "flush hint" support.

   Flush hints are addresses advertised by the ACPI 6+ NFIT (NVDIMM
   Firmware Interface Table) that when written and fenced guarantee that
   writes pending in platform write buffers (outside the cpu) have been
   flushed to media.  They might also be used by hypervisors as a
   trigger condition to flush guest-persistent memory ranges to storage.

    Fix a potential data corruption issue, a broken definition of the
    hint array, a wrong allocation size for the unit test implementation
    of the flush hint table, and missing NULL check in an error path.

    The unit test, while it did not prevent these bugs from being
    merged, at least triggered occasional crashes in advance of
    production usages.

 - Fix handling of ACPI DSM error status results.  The DSM mechanism
   allows communication with platform and memory device firmware.  We
   correctly parse known errors, but were silently ignoring others.

   Fix it to consistently fail any command with a non-zero status return
   that we otherwise do not interpret / handle.

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm, region: fix flush hint table thinko
  nfit: fail DSMs that return non-zero status by default
  libnvdimm: fix devm_nvdimm_memremap() error path
  tools/testing/nvdimm: fix allocation range for mock flush hint tables
  nvdimm: fix PHYS_PFN/PFN_PHYS mixup
      c6169de7
  5. 28 Sep, 2016 10 commits
  7. 27 Sep, 2016 3 commits
  9. 26 Sep, 2016 3 commits
  11. 25 Sep, 2016 7 commits
    • Lorenzo Stoakes's avatar
      mm: check VMA flags to avoid invalid PROT_NONE NUMA balancing · 38e08854
      Lorenzo Stoakes authored 
      The NUMA balancing logic uses an arch-specific PROT_NONE page table flag
defined by pte_protnone() or pmd_protnone() to mark PTEs or huge page
PMDs respectively as requiring balancing upon a subsequent page fault.
User-defined PROT_NONE memory regions which also have this flag set will
not normally invoke the NUMA balancing code as do_page_fault() will send
a segfault to the process before handle_mm_fault() is even called.

However if access_remote_vm() is invoked to access a PROT_NONE region of
memory, handle_mm_fault() is called via faultin_page() and
__get_user_pages() without any access checks being performed, meaning
the NUMA balancing logic is incorrectly invoked on a non-NUMA memory
region.

A simple means of triggering this problem is to access PROT_NONE mmap'd
memory using /proc/self/mem which reliably results in the NUMA handling
functions being invoked when CONFIG_NUMA_BALANCING is set.

This issue was reported in bugzilla (issue 99101) which includes some
simple repro code.

There are BUG_ON() checks in do_numa_page() and do_huge_pmd_numa_page()
added at commit c0e7cad9 to avoid accidentally provoking strange
behaviour by attempting to apply NUMA balancing to pages that are in
fact PROT_NONE.  The BUG_ON()'s are consistently triggered by the repro.

This patch moves the PROT_NONE check into mm/memory.c rather than
invoking BUG_ON() as faulting in these pages via faultin_page() is a
valid reason for reaching the NUMA check with the PROT_NONE page table
flag set and is therefore not always a bug.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=99101Reported-by: default avatarTrevor Saunders <tbsaunde@tbsaunde.org>
Signed-off-by: default avatarLorenzo Stoakes <lstoakes@gmail.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      38e08854
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 831e45d8
      Linus Torvalds authored 
      Pull MIPS fixes from Ralf Baechle:
 "A round of 4.8 fixes:

  MIPS generic code:
   - Add a missing ".set pop" in an early commit
   - Fix memory regions reaching top of physical
   - MAAR: Fix address alignment
   - vDSO: Fix Malta EVA mapping to vDSO page structs
   - uprobes: fix incorrect uprobe brk handling
   - uprobes: select HAVE_REGS_AND_STACK_ACCESS_API
   - Avoid a BUG warning during PR_SET_FP_MODE prctl
   - SMP: Fix possibility of deadlock when bringing CPUs online
   - R6: Remove compact branch policy Kconfig entries
   - Fix size calc when avoiding IPIs for small icache flushes
   - Fix pre-r6 emulation FPU initialisation
   - Fix delay slot emulation count in debugfs

  ATH79:
   - Fix test for error return of clk_register_fixed_factor.

  Octeon:
   - Fix kernel header to work for VDSO build.
   - Fix initialization of platform device probing.

  paravirt:
   - Fix undefined reference to smp_bootstrap"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: Fix delay slot emulation count in debugfs
  MIPS: SMP: Fix possibility of deadlock when bringing CPUs online
  MIPS: Fix pre-r6 emulation FPU initialisation
  MIPS: vDSO: Fix Malta EVA mapping to vDSO page structs
  MIPS: Select HAVE_REGS_AND_STACK_ACCESS_API
  MIPS: Octeon: Fix platform bus probing
  MIPS: Octeon: mangle-port: fix build failure with VDSO code
  MIPS: Avoid a BUG warning during prctl(PR_SET_FP_MODE, ...)
  MIPS: c-r4k: Fix size calc when avoiding IPIs for small icache flushes
  MIPS: Add a missing ".set pop" in an early commit
  MIPS: paravirt: Fix undefined reference to smp_bootstrap
  MIPS: Remove compact branch policy Kconfig entries
  MIPS: MAAR: Fix address alignment
  MIPS: Fix memory regions reaching top of physical
  MIPS: uprobes: fix incorrect uprobe brk handling
  MIPS: ath79: Fix test for error return of clk_register_fixed_factor().
      831e45d8
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 751b9a5d
      Linus Torvalds authored 
      Pull one more powerpc fix from Michael Ellerman:
 "powernv/pci: Fix m64 checks for SR-IOV and window alignment from
  Russell Currey"

* tag 'powerpc-4.8-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/powernv/pci: Fix m64 checks for SR-IOV and window alignment
      751b9a5d
    • Linus Torvalds's avatar
      radix tree: fix sibling entry handling in radix_tree_descend() · 8d2c0d36
      Linus Torvalds authored 
      The fixes to the radix tree test suite show that the multi-order case is
broken.  The basic reason is that the radix tree code uses tagged
pointers with the "internal" bit in the low bits, and calculating the
pointer indices was supposed to mask off those bits.  But gcc will
notice that we then use the index to re-create the pointer, and will
avoid doing the arithmetic and use the tagged pointer directly.

This cleans the code up, using the existing is_sibling_entry() helper to
validate the sibling pointer range (instead of open-coding it), and
using entry_to_node() to mask off the low tag bit from the pointer.  And
once you do that, you might as well just use the now cleaned-up pointer
directly.

[ Side note: the multi-order code isn't actually ever used in the kernel
  right now, and the only reason I didn't just delete all that code is
  that Kirill Shutemov piped up and said:

    "Well, my ext4-with-huge-pages patchset[1] uses multi-order entries.
     It also converts shmem-with-huge-pages and hugetlb to them.

     I'm okay with converting it to other mechanism, but I need
     something.  (I looked into Konstantin's RFC patchset[2].  It looks
     okay, but I don't feel myself qualified to review it as I don't
     know much about radix-tree internals.)"

  [1] http://lkml.kernel.org/r/20160915115523.29737-1-kirill.shutemov@linux.intel.com
  [2] http://lkml.kernel.org/r/147230727479.9957.1087787722571077339.stgit@zurg ]
Reported-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Cedric Blancher <cedric.blancher@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d2c0d36
    • Matthew Wilcox's avatar
      radix tree test suite: Test radix_tree_replace_slot() for multiorder entries · 62fd5258
      Matthew Wilcox authored 
      When we replace a multiorder entry, check that all indices reflect the
new value.

Also, compile the test suite with -O2, which shows other problems with
the code due to some dodgy pointer operations in the radix tree code.
Signed-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      62fd5258
    • Al Viro's avatar
      fix memory leaks in tracing_buffers_splice_read() · 1ae2293d
      Al Viro authored 
      Cc: stable@vger.kernel.org
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      1ae2293d
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Move mutex to protect against resetting of seq data · 1245800c
      Steven Rostedt (Red Hat) authored 
      The iter->seq can be reset outside the protection of the mutex. So can
reading of user data. Move the mutex up to the beginning of the function.

Fixes: d7350c3f ("tracing/core: make the read callbacks reentrants")
Cc: stable@vger.kernel.org # 2.6.30+
Reported-by: default avatarAl Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      1245800c
  13. 24 Sep, 2016 10 commits
    • Paul Burton's avatar
      MIPS: Fix delay slot emulation count in debugfs · 116e7111
      Paul Burton authored 
      Commit 432c6bac ("MIPS: Use per-mm page to execute branch delay slot
instructions") accidentally removed use of the MIPS_FPU_EMU_INC_STATS
macro from do_dsemulret, leading to the ds_emul file in debugfs always
returning zero even though we perform delay slot emulations.

Fix this by re-adding the use of the MIPS_FPU_EMU_INC_STATS macro.
Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Fixes: 432c6bac ("MIPS: Use per-mm page to execute branch delay slot instructions")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14301/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      116e7111
    • Matt Redfearn's avatar
      MIPS: SMP: Fix possibility of deadlock when bringing CPUs online · 8f46cca1
      Matt Redfearn authored 
      This patch fixes the possibility of a deadlock when bringing up
secondary CPUs.
The deadlock occurs because the set_cpu_online() is called before
synchronise_count_slave(). This can cause a deadlock if the boot CPU,
having scheduled another thread, attempts to send an IPI to the
secondary CPU, which it sees has been marked online. The secondary is
blocked in synchronise_count_slave() waiting for the boot CPU to enter
synchronise_count_master(), but the boot cpu is blocked in
smp_call_function_many() waiting for the secondary to respond to it's
IPI request.

Fix this by marking the CPU online in cpu_callin_map and synchronising
counters before declaring the CPU online and calculating the maps for
IPIs.
Signed-off-by: default avatarMatt Redfearn <matt.redfearn@imgtec.com>
Reported-by: default avatarJustin Chen <justinpopo6@gmail.com>
Tested-by: default avatarJustin Chen <justinpopo6@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: stable@vger.kernel.org # v4.1+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14302/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      8f46cca1
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 9c0e28a7
      Linus Torvalds authored 
      Pull perf fixes from Thomas Gleixner:
 "Three fixlets for perf:

   - add a missing NULL pointer check in the intel BTS driver

   - make BTS an exclusive PMU because BTS can only handle one event at
     a time

   - ensure that exclusive events are limited to one PMU so that several
     exclusive events can be scheduled on different PMU instances"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Limit matching exclusive events to one PMU
  perf/x86/intel/bts: Make it an exclusive PMU
  perf/x86/intel/bts: Make sure debug store is valid
      9c0e28a7
    • Linus Torvalds's avatar
      Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 2507c856
      Linus Torvalds authored 
      Pull locking fixes from Thomas Gleixner:
 "Two smallish fixes:

   - use the proper asm constraint in the Super-H atomic_fetch_ops

   - a trivial typo fix in the Kconfig help text"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/hung_task: Fix typo in CONFIG_DETECT_HUNG_TASK help text
  locking/atomic, arch/sh: Fix ATOMIC_FETCH_OP()
      2507c856
    • Linus Torvalds's avatar
      Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 709b8f67
      Linus Torvalds authored 
      Pull EFI fixes from Thomas Gleixner:
 "Two fixes for EFI/PAT:

   - a 32bit overflow bug in the PAT code which was unearthed by the
     large EFI mappings

   - prevent a boot hang on large systems when EFI mixed mode is enabled
     but not used"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/efi: Only map RAM into EFI page tables if in mixed-mode
  x86/mm/pat: Prevent hang during boot when mapping pages
      709b8f67
    • Linus Torvalds's avatar
      Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 4b8b0ff6
      Linus Torvalds authored 
      Pull irq fixes from Thomas Gleixner:
 "Three fixes for irq core and irq chip drivers:

   - Do not set the irq type if type is NONE.  Fixes a boot regression
     on various SoCs

   - Use the proper cpu for setting up the GIC target list.  Discovered
     by the cpumask debugging code.

   - A rather large fix for the MIPS-GIC so per cpu local interrupts
     work again.  This was discovered late because the code falls back
     to slower timers which use normal device interrupts"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/mips-gic: Fix local interrupts
  irqchip/gicv3: Silence noisy DEBUG_PER_CPU_MAPS warning
  genirq: Skip chained interrupt trigger setup if type is IRQ_TYPE_NONE
      4b8b0ff6
    • Dan Williams's avatar
      libnvdimm, region: fix flush hint table thinko · 595c7307
      Dan Williams authored 
      The definition of the flush hint table as:

	void __iomem *flush_wpq[0][0];

...passed the unit test, but is broken as flush_wpq[0][1] and
flush_wpq[1][0] refer to the same entry.  Fix this to use a helper that
calculates a slot in the table based on the geometry of flush hints in
the region.  This is important to get right since virtualization
solutions use this mechanism to trigger hypervisor flushes to platform
persistence.
Reported-by: default avatarDave Jiang <dave.jiang@intel.com>
Tested-by: default avatarDave Jiang <dave.jiang@intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      595c7307
    • Linus Torvalds's avatar
      Merge branch 'hughd-fixes' (patches from Hugh Dickins) · 0f265741
      Linus Torvalds authored 
      Merge VM fixes from High Dickins:
 "I get the impression that Andrew is away or busy at the moment, so I'm
  going to send you three independent uncontroversial little mm fixes
  directly - though none is strictly a 4.8 regression fix.

   - shmem: fix tmpfs to handle the huge= option properly from Toshi
     Kani is a one-liner to fix a major embarrassment in 4.8's hugepages
     on tmpfs feature: although Hillf pointed it out in June, somehow
     both Kirill and I repeatedly dropped the ball on this one.  You
     might wonder if the feature got tested at all with that bug in:
     yes, it did, but for wider testing coverage, Kirill and I had each
     relied too much on an override which bypasses that condition.

   - huge tmpfs: fix Committed_AS leak just a run-of-the-mill accounting
     fix in the same feature.

   - mm: delete unnecessary and unsafe init_tlb_ubc() is an unrelated
     fix to 4.3's TLB flush batching in reclaim: the bug would be rare,
     and none of us will be shamed if this one misses 4.8; but it got
     such a quick ack from Mel today that I'm inclined to offer it along
     with the first two"

* emailed patches from Hugh Dickins <hughd@google.com>:
  mm: delete unnecessary and unsafe init_tlb_ubc()
  huge tmpfs: fix Committed_AS leak
  shmem: fix tmpfs to handle the huge= option properly
      0f265741
    • Hugh Dickins's avatar
      mm: delete unnecessary and unsafe init_tlb_ubc() · b385d21f
      Hugh Dickins authored 
      init_tlb_ubc() looked unnecessary to me: tlb_ubc is statically
initialized with zeroes in the init_task, and copied from parent to
child while it is quiescent in arch_dup_task_struct(); so I went to
delete it.

But inserted temporary debug WARN_ONs in place of init_tlb_ubc() to
check that it was always empty at that point, and found them firing:
because memcg reclaim can recurse into global reclaim (when allocating
biosets for swapout in my case), and arrive back at the init_tlb_ubc()
in shrink_node_memcg().

Resetting tlb_ubc.flush_required at that point is wrong: if the upper
level needs a deferred TLB flush, but the lower level turns out not to,
we miss a TLB flush.  But fortunately, that's the only part of the
protocol that does not nest: with the initialization removed, cpumask
collects bits from upper and lower levels, and flushes TLB when needed.

Fixes: 72b252ae ("mm: send one IPI per CPU to TLB flush all entries after unmapping pages")
Signed-off-by: default avatarHugh Dickins <hughd@google.com>
Acked-by: default avatarMel Gorman <mgorman@techsingularity.net>
Cc: stable@vger.kernel.org # 4.3+
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b385d21f
    • Hugh Dickins's avatar
      huge tmpfs: fix Committed_AS leak · 71664665
      Hugh Dickins authored 
      Under swapping load on huge tmpfs, /proc/meminfo's Committed_AS grows
bigger and bigger: just a cosmetic issue for most users, but disabling
for those who run without overcommit (/proc/sys/vm/overcommit_memory 2).

shmem_uncharge() was forgetting to unaccount __vm_enough_memory's
charge, and shmem_charge() was forgetting it on the filesystem-full
error path.

Fixes: 800d8c63 ("shmem: add huge pages support")
Signed-off-by: default avatarHugh Dickins <hughd@google.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      71664665
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