diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-03-01 05:13:49 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-01 23:53:39 +0100 |
| commit | 34bbd704051c9d053d69e90569a3a2365f4c7b50 (patch) | |
| tree | f5fb6f3941cd09be0fb92ae80f9759ad64fca709 /mm/tiny-shmem.c | |
| parent | [PATCH] Documentation: CPU load calculation description (diff) | |
| download | linux-34bbd704051c9d053d69e90569a3a2365f4c7b50.tar.xz linux-34bbd704051c9d053d69e90569a3a2365f4c7b50.zip | |
[PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU
page_lock_anon_vma() uses spin_lock() to block RCU. This doesn't work with
PREEMPT_RCU, we have to do rcu_read_lock() explicitely. Otherwise, it is
theoretically possible that slab returns anon_vma's memory to the system
before we do spin_unlock(&anon_vma->lock).
[ Hugh points out that this only matters for PREEMPT_RCU, which isn't merged
yet, and may never be. Regardless, this patch is conceptually the
right thing to do, even if it doesn't matter at this point. - Linus ]
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/tiny-shmem.c')
0 files changed, 0 insertions, 0 deletions