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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 <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins
2005-11-21 21:32:14 -08:00
committed by Linus Torvalds
parent 1cdca61bf8
commit 664beed019
4 changed files with 0 additions and 31 deletions
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19
include/linux/mm.h
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@@ -311,8 +311,6 @@ struct page {
extern void FASTCALL(__page_cache_release(struct page *));
#ifdef CONFIG_HUGETLB_PAGE
static inline int page_count(struct page *page)
{
if (PageCompound(page))
@@ -329,23 +327,6 @@ static inline void get_page(struct page *page)
void put_page(struct page *page);
#else /* CONFIG_HUGETLB_PAGE */
#define page_count(p) (atomic_read(&(p)->_count) + 1)
static inline void get_page(struct page *page)
{
atomic_inc(&page->_count);
}
static inline void put_page(struct page *page)
{
if (put_page_testzero(page))
__page_cache_release(page);
}
#endif /* CONFIG_HUGETLB_PAGE */
/*
* Multiple processes may "see" the same page. E.g. for untouched
* mappings of /dev/null, all processes see the same page full of