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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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5
mm/page_alloc.c
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@@ -148,10 +148,6 @@ static void bad_page(const char *function, struct page *page)
add_taint(TAINT_BAD_PAGE);
}
#ifndef CONFIG_HUGETLB_PAGE
#define prep_compound_page(page, order) do { } while (0)
#define destroy_compound_page(page, order) do { } while (0)
#else
/*
* Higher-order pages are called "compound pages". They are structured thusly:
*
@@ -205,7 +201,6 @@ static void destroy_compound_page(struct page *page, unsigned long order)
ClearPageCompound(p);
}
}
#endif /* CONFIG_HUGETLB_PAGE */
/*
* function for dealing with page's order in buddy system.