1. 15 Feb, 2014 1 commit
  2. 10 Feb, 2014 4 commits
  3. 09 Feb, 2014 9 commits
    • Al Viro's avatar
      fix a kmap leak in virtio_console · c9efe511
      Al Viro authored
      
      
      While we are at it, don't do kmap() under kmap_atomic(), *especially*
      for a page we'd allocated with GFP_KERNEL.  It's spelled "page_address",
      and had that been more than that, we'd have a real trouble - kmap_high()
      can block, and doing that while holding kmap_atomic() is a Bad Idea(tm).
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      c9efe511
    • Al Viro's avatar
      fix O_SYNC|O_APPEND syncing the wrong range on write() · d311d79d
      Al Viro authored
      
      
      It actually goes back to 2004 ([PATCH] Concurrent O_SYNC write support)
      when sync_page_range() had been introduced; generic_file_write{,v}() correctly
      synced
      	pos_after_write - written .. pos_after_write - 1
      but generic_file_aio_write() synced
      	pos_before_write .. pos_before_write + written - 1
      instead.  Which is not the same thing with O_APPEND, obviously.
      A couple of years later correct variant had been killed off when
      everything switched to use of generic_file_aio_write().
      
      All users of generic_file_aio_write() are affected, and the same bug
      has been copied into other instances of ->aio_write().
      
      The fix is trivial; the only subtle point is that generic_write_sync()
      ought to be inlined to avoid calculations useless for the majority of
      calls.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      d311d79d
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 9c1db779
      Linus Torvalds authored
      Pull btrfs fixes from Chris Mason:
       "This is a small collection of fixes"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: fix data corruption when reading/updating compressed extents
        Btrfs: don't loop forever if we can't run because of the tree mod log
        btrfs: reserve no transaction units in btrfs_ioctl_set_features
        btrfs: commit transaction after setting label and features
        Btrfs: fix assert screwup for the pending move stuff
      9c1db779
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 6f2a1c1e
      Linus Torvalds authored
      Pull perf fixes from Ingo Molnar:
       "Tooling fixes, mostly related to the KASLR fallout, but also other
        fixes"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        perf buildid-cache: Check relocation when checking for existing kcore
        perf tools: Adjust kallsyms for relocated kernel
        perf tests: No need to set up ref_reloc_sym
        perf symbols: Prevent the use of kcore if the kernel has moved
        perf record: Get ref_reloc_sym from kernel map
        perf machine: Set up ref_reloc_sym in machine__create_kernel_maps()
        perf machine: Add machine__get_kallsyms_filename()
        perf tools: Add kallsyms__get_function_start()
        perf symbols: Fix symbol annotation for relocated kernel
        perf tools: Fix include for non x86 architectures
        perf tools: Fix AAAAARGH64 memory barriers
        perf tools: Demangle kernel and kernel module symbols too
        perf/doc: Remove mention of non-existent set_perf_event_pending() from design.txt
      6f2a1c1e
    • Filipe David Borba Manana's avatar
      Btrfs: fix data corruption when reading/updating compressed extents · a2aa75e1
      Filipe David Borba Manana authored
      
      
      When using a mix of compressed file extents and prealloc extents, it
      is possible to fill a page of a file with random, garbage data from
      some unrelated previous use of the page, instead of a sequence of zeroes.
      
      A simple sequence of steps to get into such case, taken from the test
      case I made for xfstests, is:
      
         _scratch_mkfs
         _scratch_mount "-o compress-force=lzo"
         $XFS_IO_PROG -f -c "pwrite -S 0x06 -b 18670 266978 18670" $SCRATCH_MNT/foobar
         $XFS_IO_PROG -c "falloc 26450 665194" $SCRATCH_MNT/foobar
         $XFS_IO_PROG -c "truncate 542872" $SCRATCH_MNT/foobar
         $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar
      
      This results in the following file items in the fs tree:
      
         item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
             inode generation 6 transid 6 size 542872 block group 0 mode 100600
         item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
             inode ref index 2 namelen 6 name: foobar
         item 6 key (257 EXTENT_DATA 0) itemoff 15810 itemsize 53
             extent data disk byte 0 nr 0 gen 6
             extent data offset 0 nr 24576 ram 266240
             extent compression 0
         item 7 key (257 EXTENT_DATA 24576) itemoff 15757 itemsize 53
             prealloc data disk byte 12849152 nr 241664 gen 6
             prealloc data offset 0 nr 241664
         item 8 key (257 EXTENT_DATA 266240) itemoff 15704 itemsize 53
             extent data disk byte 12845056 nr 4096 gen 6
             extent data offset 0 nr 20480 ram 20480
             extent compression 2
         item 9 key (257 EXTENT_DATA 286720) itemoff 15651 itemsize 53
             prealloc data disk byte 13090816 nr 405504 gen 6
             prealloc data offset 0 nr 258048
      
      The on disk extent at offset 266240 (which corresponds to 1 single disk block),
      contains 5 compressed chunks of file data. Each of the first 4 compress 4096
      bytes of file data, while the last one only compresses 3024 bytes of file data.
      Therefore a read into the file region [285648 ; 286720[ (length = 4096 - 3024 =
      1072 bytes) should always return zeroes (our next extent is a prealloc one).
      
      The solution here is the compression code path to zero the remaining (untouched)
      bytes of the last page it uncompressed data into, as the information about how
      much space the file data consumes in the last page is not known in the upper layer
      fs/btrfs/extent_io.c:__do_readpage(). In __do_readpage we were correctly zeroing
      the remainder of the page but only if it corresponds to the last page of the inode
      and if the inode's size is not a multiple of the page size.
      
      This would cause not only returning random data on reads, but also permanently
      storing random data when updating parts of the region that should be zeroed.
      For the example above, it means updating a single byte in the region [285648 ; 286720[
      would store that byte correctly but also store random data on disk.
      
      A test case for xfstests follows soon.
      Signed-off-by: default avatarFilipe David Borba Manana <fdmanana@gmail.com>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      a2aa75e1
    • Josef Bacik's avatar
      Btrfs: don't loop forever if we can't run because of the tree mod log · 27a377db
      Josef Bacik authored
      
      
      A user reported a 100% cpu hang with my new delayed ref code.  Turns out I
      forgot to increase the count check when we can't run a delayed ref because of
      the tree mod log.  If we can't run any delayed refs during this there is no
      point in continuing to look, and we need to break out.  Thanks,
      Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      27a377db
    • David Sterba's avatar
      btrfs: reserve no transaction units in btrfs_ioctl_set_features · 8051aa1a
      David Sterba authored
      
      
      Added in patch "btrfs: add ioctls to query/change feature bits online"
      modifications to superblock don't need to reserve metadata blocks when
      starting a transaction.
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      8051aa1a
    • Jeff Mahoney's avatar
      btrfs: commit transaction after setting label and features · d0270aca
      Jeff Mahoney authored
      
      
      The set_fslabel ioctl uses btrfs_end_transaction, which means it's
      possible that the change will be lost if the system crashes, same for
      the newly set features. Let's use btrfs_commit_transaction instead.
      Signed-off-by: default avatarJeff Mahoney <jeffm@suse.com>
      Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      d0270aca
    • Josef Bacik's avatar
      Btrfs: fix assert screwup for the pending move stuff · 6cc98d90
      Josef Bacik authored
      
      
      Wang noticed that he was failing btrfs/030 even though me and Filipe couldn't
      reproduce.  Turns out this is because Wang didn't have CONFIG_BTRFS_ASSERT set,
      which meant that a key part of Filipe's original patch was not being built in.
      This appears to be a mess up with merging Filipe's patch as it does not exist in
      his original patch.  Fix this by changing how we make sure del_waiting_dir_move
      asserts that it did not error and take the function out of the ifdef check.
      This makes btrfs/030 pass with the assert on or off.  Thanks,
      Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
      Reviewed-by: default avatarFilipe Manana <fdmanana@gmail.com>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      6cc98d90
  4. 08 Feb, 2014 6 commits
  5. 07 Feb, 2014 15 commits
    • Linus Torvalds's avatar
      Merge tag 'driver-core-3.14-rc2' of... · 34a9bff4
      Linus Torvalds authored
      Merge tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
      
      Pull driver core fix from Greg KH:
       "Here is a single kernfs fix to resolve a much-reported lockdep issue
        with the removal of entries in sysfs"
      
      * tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
        kernfs: make kernfs_deactivate() honor KERNFS_LOCKDEP flag
      34a9bff4
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client · 41f76d8b
      Linus Torvalds authored
      Pull ceph fixes from Sage Weil:
       "There is an RBD fix for a crash due to the immutable bio changes, an
        error path fix, and a locking fix in the recent redirect support"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
        libceph: do not dereference a NULL bio pointer
        libceph: take map_sem for read in handle_reply()
        libceph: factor out logic from ceph_osdc_start_request()
        libceph: fix error handling in ceph_osdc_init()
      41f76d8b
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 42be3f35
      Linus Torvalds authored
      Pull arm64 fixes from Catalin Marinas:
       - Relax VDSO alignment requirements so that the kernel-picked one (4K)
         does not conflict with the dynamic linker's one (64K)
       - VDSO gettimeofday fix
       - Barrier fixes for atomic operations and cache flushing
       - TLB invalidation when overriding early page mappings during boot
       - Wired up new 32-bit arm (compat) syscalls
       - LSM_MMAP_MIN_ADDR when COMPAT is enabled
       - defconfig update
       - Clean-up (comments, pgd_alloc).
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: defconfig: Expand default enabled features
        arm64: asm: remove redundant "cc" clobbers
        arm64: atomics: fix use of acquire + release for full barrier semantics
        arm64: barriers: allow dsb macro to take option parameter
        security: select correct default LSM_MMAP_MIN_ADDR on arm on arm64
        arm64: compat: Wire up new AArch32 syscalls
        arm64: vdso: update wtm fields for CLOCK_MONOTONIC_COARSE
        arm64: vdso: fix coarse clock handling
        arm64: simplify pgd_alloc
        arm64: fix typo: s/SERRROR/SERROR/
        arm64: Invalidate the TLB when replacing pmd entries during boot
        arm64: Align CMA sizes to PAGE_SIZE
        arm64: add DSB after icache flush in __flush_icache_all()
        arm64: vdso: prevent ld from aligning PT_LOAD segments to 64k
      42be3f35
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · d94d0e27
      Linus Torvalds authored
      Pull MIPS updates from Ralf Baechle:
       "hree minor patches.  All have sat in -next for a few days"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: fpu.h: Fix build when CONFIG_BUG is not set
        MIPS: Wire up sched_setattr/sched_getattr syscalls
        MIPS: Alchemy: Fix DB1100 GPIO registration
      d94d0e27
    • Linus Torvalds's avatar
      Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media · 3e382dd9
      Linus Torvalds authored
      Pull media fixes from Mauro Carvalho Chehab:
       "A series of small fixes.  Mostly driver ones.  There is one core
        regression fix on a patch that was meant to fix some race issues on
        vb2, but that actually caused more harm than good.  So, we're just
        reverting it for now"
      
      * 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
        [media] adv7842: Composite free-run platfrom-data fix
        [media] v4l2-dv-timings: fix GTF calculation
        [media] hdpvr: Fix memory leak in debug
        [media] af9035: add ID [2040:f900] Hauppauge WinTV-MiniStick 2
        [media] mxl111sf: Fix compile when CONFIG_DVB_USB_MXL111SF is unset
        [media] mxl111sf: Fix unintentional garbage stack read
        [media] cx24117: use a valid dev pointer for dev_err printout
        [media] cx24117: remove dead code in always 'false' if statement
        [media] update Michael Krufky's email address
        [media] vb2: Check if there are buffers before streamon
        [media] Revert "[media] videobuf_vm_{open,close} race fixes"
        [media] go7007-loader: fix usb_dev leak
        [media] media: bt8xx: add missing put_device call
        [media] exynos4-is: Compile in fimc-lite runtime PM callbacks conditionally
        [media] exynos4-is: Compile in fimc runtime PM callbacks conditionally
        [media] exynos4-is: Fix error paths in probe() for !pm_runtime_enabled()
        [media] s5p-jpeg: Fix wrong NV12 format parameters
        [media] s5k5baf: allow to handle arbitrary long i2c sequences
      3e382dd9
    • Linus Torvalds's avatar
      Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging · 2091f435
      Linus Torvalds authored
      Pull hwmon fixes from Guenter Roeck:
       "Fix PMBus driver problem with some multi-page voltage sensors and fix
        da9055 interrupt initialization"
      
      * tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
        hwmon: (da9055) Remove use of regmap_irq_get_virq()
        hwmon: (pmbus) Support per-page exponent in linear mode
      2091f435
    • Linus Torvalds's avatar
      Merge tag 'pm+acpi-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 22446d3f
      Linus Torvalds authored
      Pull ACPI and power management fixes from Rafael Wysocki:
       "These include a fix for a recent ACPI hotplug regression, four
        concurrency related fixes and one PCI device removal fix for
        ACPI-based PCI hotplug (ACPIPHP), intel_pstate fix that should go into
        stable, three simple ACPI cleanups and a new entry for the ACPI video
        blacklist.
      
        Specifics:
      
         - Fix for a recent ACPI hotplug regression causing a NULL pointer
           dereference to occur while handling ACPI eject notifications for
           already ejected devices.  From Toshi Kani.
      
         - Four concurrency-related fixes for ACPIPHP.  Two of them add
           missing locking and the other two fix race conditions related to
           reference counting.
      
         - ACPIPHP fix to avoid NULL pointer dereferences during device
           removal involving Virtual Funcions.
      
         - intel_pstate fix to make it compute the percentage of time the CPU
           is busy properly.  From Dirk Brandewie.
      
         - Removal of two unnecessary NULL pointer checks in ACPI code and a
           fix for sscanf() format string from Dan Carpenter and Luis G.F.
      
         - New ACPI video blacklist entry for HP EliteBook Revolve 810 from
           Mika Westerberg"
      
      * tag 'pm+acpi-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / hotplug: Fix panic on eject to ejected device
        ACPI / battery: Fix incorrect sscanf() string in acpi_battery_init_alarm()
        ACPI / proc: remove unneeded NULL check
        ACPI / utils: remove a pointless NULL check
        ACPI / video: Add HP EliteBook Revolve 810 to the blacklist
        intel_pstate: Take core C0 time into account for core busy calculation
        ACPI / hotplug / PCI: Fix bridge removal race vs dock events
        ACPI / hotplug / PCI: Fix bridge removal race in handle_hotplug_event()
        ACPI / hotplug / PCI: Scan root bus under the PCI rescan-remove lock
        ACPI / hotplug / PCI: Move PCI rescan-remove locking to hotplug_event()
        ACPI / hotplug / PCI: Remove entries from bus->devices in reverse order
      22446d3f
    • Ilya Dryomov's avatar
      libceph: do not dereference a NULL bio pointer · 0ec1d15e
      Ilya Dryomov authored
      Commit f38a5181
      
       ("ceph: Convert to immutable biovecs") introduced
      a NULL pointer dereference, which broke rbd in -rc1.  Fix it.
      
      Cc: Kent Overstreet <kmo@daterainc.com>
      Signed-off-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
      Reviewed-by: default avatarSage Weil <sage@inktank.com>
      0ec1d15e
    • H. Peter Anvin's avatar
      Merge tag 'efi-urgent' into x86/urgent · a3b072cd
      H. Peter Anvin authored
      
      
       * Avoid WARN_ON() when mapping BGRT on Baytrail (EFI 32-bit).
      Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
      a3b072cd
    • Ilya Dryomov's avatar
      libceph: take map_sem for read in handle_reply() · ff513ace
      Ilya Dryomov authored
      
      
      Handling redirect replies requires both map_sem and request_mutex.
      Taking map_sem unconditionally near the top of handle_reply() avoids
      possible race conditions that arise from releasing request_mutex to be
      able to acquire map_sem in redirect reply case.  (Lock ordering is:
      map_sem, request_mutex, crush_mutex.)
      Signed-off-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
      Reviewed-by: default avatarSage Weil <sage@inktank.com>
      ff513ace
    • Ilya Dryomov's avatar
      libceph: factor out logic from ceph_osdc_start_request() · 0bbfdfe8
      Ilya Dryomov authored
      
      
      Factor out logic from ceph_osdc_start_request() into a new helper,
      __ceph_osdc_start_request().  ceph_osdc_start_request() now amounts to
      taking locks and calling __ceph_osdc_start_request().
      Signed-off-by: default avatarIlya Dryomov <ilya.dryomov@inktank.com>
      Reviewed-by: default avatarSage Weil <sage@inktank.com>
      0bbfdfe8
    • Mark Rutland's avatar
      arm64: defconfig: Expand default enabled features · 55834a77
      Mark Rutland authored
      
      
      FPGA implementations of the Cortex-A57 and Cortex-A53 are now available
      in the form of the SMM-A57 and SMM-A53 Soft Macrocell Models (SMMs) for
      Versatile Express. As these attach to a Motherboard Express V2M-P1 it
      would be useful to have support for some V2M-P1 peripherals enabled by
      default.
      
      Additionally a couple of of features have been introduced since the last
      defconfig update (CMA, jump labels) that would be good to have enabled
      by default to ensure they are build and boot tested.
      
      This patch updates the arm64 defconfig to enable support for these
      devices and features. The arm64 Kconfig is modified to select
      HAVE_PATA_PLATFORM, which is required to enable support for the
      CompactFlash controller on the V2M-P1.
      
      A few options which don't need to appear in defconfig are trimmed:
      
      * BLK_DEV - selected by default
      * EXPERIMENTAL - otherwise gone from the kernel
      * MII - selected by drivers which require it
      * USB_SUPPORT - selected by default
      Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      55834a77
    • Will Deacon's avatar
      arm64: asm: remove redundant "cc" clobbers · 95c41896
      Will Deacon authored
      
      
      cbnz/tbnz don't update the condition flags, so remove the "cc" clobbers
      from inline asm blocks that only use these instructions to implement
      conditional branches.
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      95c41896
    • Will Deacon's avatar
      arm64: atomics: fix use of acquire + release for full barrier semantics · 8e86f0b4
      Will Deacon authored
      
      
      Linux requires a number of atomic operations to provide full barrier
      semantics, that is no memory accesses after the operation can be
      observed before any accesses up to and including the operation in
      program order.
      
      On arm64, these operations have been incorrectly implemented as follows:
      
      	// A, B, C are independent memory locations
      
      	<Access [A]>
      
      	// atomic_op (B)
      1:	ldaxr	x0, [B]		// Exclusive load with acquire
      	<op(B)>
      	stlxr	w1, x0, [B]	// Exclusive store with release
      	cbnz	w1, 1b
      
      	<Access [C]>
      
      The assumption here being that two half barriers are equivalent to a
      full barrier, so the only permitted ordering would be A -> B -> C
      (where B is the atomic operation involving both a load and a store).
      
      Unfortunately, this is not the case by the letter of the architecture
      and, in fact, the accesses to A and C are permitted to pass their
      nearest half barrier resulting in orderings such as Bl -> A -> C -> Bs
      or Bl -> C -> A -> Bs (where Bl is the load-acquire on B and Bs is the
      store-release on B). This is a clear violation of the full barrier
      requirement.
      
      The simple way to fix this is to implement the same algorithm as ARMv7
      using explicit barriers:
      
      	<Access [A]>
      
      	// atomic_op (B)
      	dmb	ish		// Full barrier
      1:	ldxr	x0, [B]		// Exclusive load
      	<op(B)>
      	stxr	w1, x0, [B]	// Exclusive store
      	cbnz	w1, 1b
      	dmb	ish		// Full barrier
      
      	<Access [C]>
      
      but this has the undesirable effect of introducing *two* full barrier
      instructions. A better approach is actually the following, non-intuitive
      sequence:
      
      	<Access [A]>
      
      	// atomic_op (B)
      1:	ldxr	x0, [B]		// Exclusive load
      	<op(B)>
      	stlxr	w1, x0, [B]	// Exclusive store with release
      	cbnz	w1, 1b
      	dmb	ish		// Full barrier
      
      	<Access [C]>
      
      The simple observations here are:
      
        - The dmb ensures that no subsequent accesses (e.g. the access to C)
          can enter or pass the atomic sequence.
      
        - The dmb also ensures that no prior accesses (e.g. the access to A)
          can pass the atomic sequence.
      
        - Therefore, no prior access can pass a subsequent access, or
          vice-versa (i.e. A is strictly ordered before C).
      
        - The stlxr ensures that no prior access can pass the store component
          of the atomic operation.
      
      The only tricky part remaining is the ordering between the ldxr and the
      access to A, since the absence of the first dmb means that we're now
      permitting re-ordering between the ldxr and any prior accesses.
      
      From an (arbitrary) observer's point of view, there are two scenarios:
      
        1. We have observed the ldxr. This means that if we perform a store to
           [B], the ldxr will still return older data. If we can observe the
           ldxr, then we can potentially observe the permitted re-ordering
           with the access to A, which is clearly an issue when compared to
           the dmb variant of the code. Thankfully, the exclusive monitor will
           save us here since it will be cleared as a result of the store and
           the ldxr will retry. Notice that any use of a later memory
           observation to imply observation of the ldxr will also imply
           observation of the access to A, since the stlxr/dmb ensure strict
           ordering.
      
        2. We have not observed the ldxr. This means we can perform a store
           and influence the later ldxr. However, that doesn't actually tell
           us anything about the access to [A], so we've not lost anything
           here either when compared to the dmb variant.
      
      This patch implements this solution for our barriered atomic operations,
      ensuring that we satisfy the full barrier requirements where they are
      needed.
      
      Cc: <stable@vger.kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      8e86f0b4
    • Adam Thomson's avatar
      hwmon: (da9055) Remove use of regmap_irq_get_virq() · 4f545a4b
      Adam Thomson authored
      
      
      Remove use of regmap_irq_get_virq() in driver probe which was
      conflicting with use of platform_get_irq_byname().
      platform_get_irq_byname() already returns the VIRQ number due
      to MFD core translation so using regmap_irq_get_virq() on that
      returned value results in an incorrect IRQ being requested.
      The driver probes then fail because of this.
      Signed-off-by: default avatarAdam Thomson <Adam.Thomson.Opensource@diasemi.com>
      Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
      4f545a4b
  6. 06 Feb, 2014 5 commits
    • Rafael J. Wysocki's avatar
      Merge branches 'acpi-cleanup' and 'acpi-video' · a2ff34c4
      Rafael J. Wysocki authored
      * acpi-cleanup:
        ACPI / battery: Fix incorrect sscanf() string in acpi_battery_init_alarm()
        ACPI / proc: remove unneeded NULL check
        ACPI / utils: remove a pointless NULL check
      
      * acpi-video:
        ACPI / video: Add HP EliteBook Revolve 810 to the blacklist
      a2ff34c4
    • Rafael J. Wysocki's avatar
      Merge branch 'pm-cpufreq' · 7fd90506
      Rafael J. Wysocki authored
      * pm-cpufreq:
        intel_pstate: Take core C0 time into account for core busy calculation
      7fd90506
    • Rafael J. Wysocki's avatar
      Merge branches 'acpi-pci-hotplug' and 'acpi-hotplug' · 93e73711
      Rafael J. Wysocki authored
      * acpi-pci-hotplug:
        ACPI / hotplug / PCI: Fix bridge removal race vs dock events
        ACPI / hotplug / PCI: Fix bridge removal race in handle_hotplug_event()
        ACPI / hotplug / PCI: Scan root bus under the PCI rescan-remove lock
        ACPI / hotplug / PCI: Move PCI rescan-remove locking to hotplug_event()
        ACPI / hotplug / PCI: Remove entries from bus->devices in reverse order
      
      * acpi-hotplug:
        ACPI / hotplug: Fix panic on eject to ejected device
      93e73711
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew Morton) · 9343224b
      Linus Torvalds authored
      Merge a bunch of fixes from Andrew Morton:
       "Commit 579f8290 ("swap: add a simple detector for inappropriate
        swapin readahead") is a feature.  No probs if you decide to defer it
        until the next merge window.
      
        It has been sitting in my tree for over a year because of my dislike
        of all the magic numbers, but recent discussion with Hugh has made me
        give up"
      
      * emailed patches fron Andrew Morton <akpm@linux-foundation.org>:
        mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq
        arch/x86/mm/numa.c: fix array index overflow when synchronizing nid to memblock.reserved.
        arch/x86/mm/numa.c: initialize numa_kernel_nodes in numa_clear_kernel_node_hotplug()
        mm: __set_page_dirty_nobuffers() uses spin_lock_irqsave() instead of spin_lock_irq()
        mm/swap: fix race on swap_info reuse between swapoff and swapon
        swap: add a simple detector for inappropriate swapin readahead
        ocfs2: free allocated clusters if error occurs after ocfs2_claim_clusters
        Documentation/kernel-parameters.txt: fix memmap= language
      9343224b
    • KOSAKI Motohiro's avatar
      mm: __set_page_dirty uses spin_lock_irqsave instead of spin_lock_irq · 227d53b3
      KOSAKI Motohiro authored
      
      
      To use spin_{un}lock_irq is dangerous if caller disabled interrupt.
      During aio buffer migration, we have a possibility to see the following
      call stack.
      
      aio_migratepage  [disable interrupt]
        migrate_page_copy
          clear_page_dirty_for_io
            set_page_dirty
              __set_page_dirty_buffers
                __set_page_dirty
                  spin_lock_irq
      
      This mean, current aio migration is a deadlockable.  spin_lock_irqsave
      is a safer alternative and we should use it.
      Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Reported-by: David Rientjes rientjes@google.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      227d53b3