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authorOleg Nesterov <oleg@redhat.com>2013-07-08 16:00:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-09 10:33:22 -0700
commit59d3132f8abdc18301898febf205d00db5f0458c (patch)
treef780fd6c6883edfbcdf2101e74941265d8e8a18b
parent345606d42971fc4ed164fbabac118708d51b8e0a (diff)
vfree: don't schedule free_work() if llist_add() returns false
vfree() only needs schedule_work(&p->wq) if p->list was empty, otherwise vfree_deferred->wq is already pending or it is running and didn't do llist_del_all() yet. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/vmalloc.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 318c5007f226..a649186669a3 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1477,7 +1477,6 @@ static void __vunmap(const void *addr, int deallocate_pages)
* conventions for vfree() arch-depenedent would be a really bad idea)
*
* NOTE: assumes that the object at *addr has a size >= sizeof(llist_node)
- *
*/
void vfree(const void *addr)
{
@@ -1489,8 +1488,8 @@ void vfree(const void *addr)
return;
if (unlikely(in_interrupt())) {
struct vfree_deferred *p = &__get_cpu_var(vfree_deferred);
- llist_add((struct llist_node *)addr, &p->list);
- schedule_work(&p->wq);
+ if (llist_add((struct llist_node *)addr, &p->list))
+ schedule_work(&p->wq);
} else
__vunmap(addr, 1);
}