1. 04 May, 2014 4 commits
  2. 03 May, 2014 29 commits
  3. 28 Apr, 2014 2 commits
  4. 27 Apr, 2014 5 commits
    • Will Deacon's avatar
      word-at-a-time: avoid undefined behaviour in zero_bytemask macro · ec6931b2
      Will Deacon authored
      The asm-generic, big-endian version of zero_bytemask creates a mask of
      bytes preceding the first zero-byte by left shifting ~0ul based on the
      position of the first zero byte.
      
      Unfortunately, if the first (top) byte is zero, the output of
      prep_zero_mask has only the top bit set, resulting in undefined C
      behaviour as we shift left by an amount equal to the width of the type.
      As it happens, GCC doesn't manage to spot this through the call to fls(),
      but the issue remains if architectures choose to implement their shift
      instructions differently.
      
      An example would be arch/arm/ (AArch32), where LSL Rd, Rn, #32 results
      in Rd == 0x0, whilst on arch/arm64 (AArch64) LSL Xd, Xn, #64 results in
      Xd == Xn.
      
      Rather than check explicitly for the problematic shift, this patch adds
      an extra shift by 1, replacing fls with __fls. Since zero_bytemask is
      never called with a zero argument (has_zero() is used to check the data
      first), we don't need to worry about calling __fls(0), which is
      undefined.
      
      Cc: <stable@vger.kernel.org>
      Cc: Victor Kamensky <victor.kamensky@linaro.org>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ec6931b2
    • Linus Torvalds's avatar
      Merge branch 'safe-dirty-tlb-flush' · ac6c9e2b
      Linus Torvalds authored
      This merges the patch to fix possible loss of dirty bit on munmap() or
      madvice(DONTNEED).  If there are concurrent writers on other CPU's that
      have the unmapped/unneeded page in their TLBs, their writes to the page
      could possibly get lost if a third CPU raced with the TLB flush and did
      a page_mkclean() before the page was fully written.
      
      Admittedly, if you unmap() or madvice(DONTNEED) an area _while_ another
      thread is still busy writing to it, you deserve all the lost writes you
      could get.  But we kernel people hold ourselves to higher quality
      standards than "crazy people deserve to lose", because, well, we've seen
      people do all kinds of crazy things.
      
      So let's get it right, just because we can, and we don't have to worry
      about it.
      
      * safe-dirty-tlb-flush:
        mm: split 'tlb_flush_mmu()' into tlb flushing and memory freeing parts
      ac6c9e2b
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs · 33c0022f
      Linus Torvalds authored
      Pull btrfs fixes from Chris Mason.
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
        Btrfs: limit the path size in send to PATH_MAX
        Btrfs: correctly set profile flags on seqlock retry
        Btrfs: use correct key when repeating search for extent item
        Btrfs: fix inode caching vs tree log
        Btrfs: fix possible memory leaks in open_ctree()
        Btrfs: avoid triggering bug_on() when we fail to start inode caching task
        Btrfs: move btrfs_{set,clear}_and_info() to ctree.h
        btrfs: replace error code from btrfs_drop_extents
        btrfs: Change the hole range to a more accurate value.
        btrfs: fix use-after-free in mount_subvol()
      33c0022f
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm · 2b9d1c05
      Linus Torvalds authored
      Pull arm fixes from Russell King:
       "A number of fixes for the PJ4/iwmmxt changes which arm-soc forced me
        to take during the merge window.  This stuff should have been better
        tested and sorted out *before* the merge window"
      
      * 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
        ARM: 8042/1: iwmmxt: allow to build iWMMXt on Marvell PJ4B
        ARM: 8041/1: pj4: fix cpu_is_pj4 check
        ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor
        ARM: 8039/1: pj4: enable iWMMXt only if CONFIG_IWMMXT is set
        ARM: 8038/1: iwmmxt: explicitly check for supported architectures
      2b9d1c05
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · afa3cad7
      Linus Torvalds authored
      Pull arm64 fixes from Catalin Marinas:
       - compat renameat2 syscall wiring and __NR_compat_syscalls fix
       - TLB fix for transparent huge pages following switch to generic
         mmu_gather
       - spinlock initialisation for init_mm's context
       - move of_clk_init() earlier
       - Kconfig duplicate entry fix
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: init: Move of_clk_init to time_init
        arm64: initialize spinlock for init_mm's context
        arm64: debug: remove noisy, pointless warning
        arm64: mm: Add THP TLB entries to general mmu_gather
        arm64: add renameat2 compat syscall
        ARM64: Remove duplicated Kconfig entry for "kernel/power/Kconfig"
        arm64: __NR_compat_syscalls fix
      afa3cad7