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mm: fix assertion 

This assertion is incorrect for lockless pagecache.  By definition if we
have an unpinned page that we are trying to take a speculative reference
to, it may become the tail of a compound page at any time (if it is
freed, then reallocated as a compound page).

It was still a valid assertion for the vmscan.c LRU isolation case, but
it doesn't seem incredibly helpful...  if somebody wants it, they can
put it back directly where it applies in the vmscan code.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2009-01-14 07:28:16 +01:00 committed by Linus Torvalds
parent a6525042bf
commit 18e6959c38
1 changed files with 0 additions and 1 deletions
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include/linux/mm.h
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@ -260,7 +260,6 @@ static inline int put_page_testzero(struct page *page)
*/
static inline int get_page_unless_zero(struct page *page)
{
VM_BUG_ON(PageTail(page));
return atomic_inc_not_zero(&page->_count);
}