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[PATCH] unpaged: unifdefed PageCompound

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It looks like snd_xxx is not the only nopage to be using PageReserved as a way
of holding a high-order page together: which no longer works, but is masked by
our failure to free from VM_RESERVED areas.  We cannot fix that bug without
first substituting another way to hold the high-order page together, while
farming out the 0-order pages from within it.

That's just what PageCompound is designed for, but it's been kept under
CONFIG_HUGETLB_PAGE.  Remove the #ifdefs: which saves some space (out- of-line
put_page), doesn't slow down what most needs to be fast (already using
hugetlb), and unifies the way we handle high-order pages.

Signed-off-by: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2005-11-21 21:32:14 -08:00 • committed by Linus Torvalds
commit 664beed019
4 changed files with 0 additions and 31 deletions
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3
mm/swap.c
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@ -34,8 +34,6 @@
/* How many pages do we try to swap or page in/out together? */
int page_cluster;
#ifdef CONFIG_HUGETLB_PAGE
void put_page(struct page *page)
{
if (unlikely(PageCompound(page))) {
@ -52,7 +50,6 @@ void put_page(struct page *page)
__page_cache_release(page);
}
EXPORT_SYMBOL(put_page);
#endif
/*
* Writeback is about to end against a page which has been marked for immediate