1. 12 Jul, 2010 1 commit
    • Miklos Szeredi's avatar
      fuse: don't use atomic kmap · 7909b1c6
      Miklos Szeredi authored
      Don't use atomic kmap for mapping userspace buffers in device
      read/write/splice.
      
      This is necessary because the next patch (adding store notify)
      requires that caller of fuse_copy_page() may sleep between
      invocations.  The simplest way to ensure this is to change the atomic
      kmaps to non-atomic ones.
      
      Thankfully architectures where kmap() is not a no-op are going out of
      fashion, so we can ignore the (probably negligible) performance impact
      of this change.
      Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
      7909b1c6
  2. 05 Jul, 2010 8 commits
  3. 04 Jul, 2010 1 commit
    • Will Deacon's avatar
      ARM: 6205/1: perf: ensure counter delta is treated as unsigned · 446a5a8b
      Will Deacon authored
      Hardware performance counters on ARM are 32-bits wide but atomic64_t
      variables are used to represent counter data in the hw_perf_event structure.
      
      The armpmu_event_update function right-shifts a signed 64-bit delta variable
      and adds the result to the event count. This can lead to shifting in sign-bits
      if the MSB of the 32-bit counter value is set. This results in perf output
      such as:
      
       Performance counter stats for 'sleep 20':
      
       18446744073460670464  cycles             <-- 0xFFFFFFFFF12A6000
              7783773  instructions             #      0.000 IPC
                  465  context-switches
                  161  page-faults
              1172393  branches
      
         20.154242147  seconds time elapsed
      
      This patch ensures that the delta value is treated as unsigned so that the
      right shift sets the upper bits to zero.
      
      Cc: <stable@kernel.org>
      Acked-by: default avatarJamie Iles <jamie.iles@picochip.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      446a5a8b
  4. 03 Jul, 2010 1 commit
  5. 02 Jul, 2010 15 commits
  6. 01 Jul, 2010 14 commits