1. 22 Dec, 2005 2 commits
    • ASANO Masahiro's avatar
      [PATCH] fix posix lock on NFS · 0800c5f7
      ASANO Masahiro authored
      
      
      NFS client prevents mandatory lock, but there is a flaw on it; Locks are
      possibly left if the mode is changed while locking.
      
      This permits unlocking even if the mandatory lock bits are set.
      Signed-off-by: default avatarASANO Masahiro <masano@tnes.nec.co.jp>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      0800c5f7
    • Nicolas Pitre's avatar
      [PATCH] fix race with preempt_enable() · d6f02913
      Nicolas Pitre authored
      
      
      Currently a simple
      
      	void foo(void) { preempt_enable(); }
      
      produces the following code on ARM:
      
      foo:
      	bic	r3, sp, #8128
      	bic	r3, r3, #63
      	ldr	r2, [r3, #4]
      	ldr	r1, [r3, #0]
      	sub	r2, r2, #1
      	tst	r1, #4
      	str	r2, [r3, #4]
      	blne	preempt_schedule
      	mov	pc, lr
      
      The problem is that the TIF_NEED_RESCHED flag is loaded _before_ the
      preemption count is stored back, hence any interrupt coming within that
      3 instruction window causing TIF_NEED_RESCHED to be set won't be
      seen and scheduling won't happen as it should.
      
      Nothing currently prevents gcc from performing that reordering.  There
      is already a barrier() before the decrement of the preemption count, but
      another one is needed between this and the TIF_NEED_RESCHED flag test
      for proper code ordering.
      Signed-off-by: default avatarNicolas Pitre <nico@cam.org>
      Acked-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      d6f02913
  2. 21 Dec, 2005 6 commits
  3. 20 Dec, 2005 14 commits
  4. 19 Dec, 2005 18 commits