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vfree: don't schedule free_work() if llist_add() returns false

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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>
This commit is contained in:
Oleg Nesterov 2013-07-08 16:00:08 -07:00 committed by Linus Torvalds
parent 345606d429
commit 59d3132f8a
1 changed files with 2 additions and 3 deletions
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5
mm/vmalloc.c
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@ -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);
}