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authorIngo Molnar <mingo@elte.hu>2006-07-03 03:25:15 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 18:27:08 -0400
commitad33945175bed649ca5fe0881269db005bbb449a (patch)
tree2aac47ea54ac59f33e8188e25e1e9d9807eecae7 /kernel
parentd378834840907326ac9d448056d957d13cc3718f (diff)
[PATCH] lockdep: annotate ->mmap_sem
Teach special (recursive) locking code to the lock validator. Has no effect on non-lockdep kernels. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 7f48abdd7bb6..54953d8a6f17 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -193,7 +193,10 @@ static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
193 193
194 down_write(&oldmm->mmap_sem); 194 down_write(&oldmm->mmap_sem);
195 flush_cache_mm(oldmm); 195 flush_cache_mm(oldmm);
196 down_write(&mm->mmap_sem); 196 /*
197 * Not linked in yet - no deadlock potential:
198 */
199 down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING);
197 200
198 mm->locked_vm = 0; 201 mm->locked_vm = 0;
199 mm->mmap = NULL; 202 mm->mmap = NULL;