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mm: page_alloc: generalize order handling in __free_pages_bootmem()

Browse source 
__free_pages_bootmem() used to special-case higher-order frees to save
individual page checking with free_pages_bulk().

Nowadays, both zero order and non-zero order frees use free_pages(), which
checks each individual page anyway, and so there is little point in making
the distinction anymore.  The higher-order loop will work just fine for
zero order pages.

Signed-off-by: Johannes Weiner <[email protected]>
Cc: Uwe Kleine-König <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner 2012-01-10 15:08:10 -08:00 • committed by Linus Torvalds
commit c3993076f8
1 changed files with 12 additions and 21 deletions
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33
mm/page_alloc.c
View file

@ -730,32 +730,23 @@ static void __free_pages_ok(struct page *page, unsigned int order)
local_irq_restore(flags);
}
/*
* permit the bootmem allocator to evade page validation on high-order frees
*/
void __meminit __free_pages_bootmem(struct page *page, unsigned int order)
{
if (order == 0) {
__ClearPageReserved(page);
set_page_count(page, 0);
set_page_refcounted(page);
__free_page(page);
} else {
int loop;
unsigned int nr_pages = 1 << order;
unsigned int loop;
prefetchw(page);
for (loop = 0; loop < (1 << order); loop++) {
struct page *p = &page[loop];
prefetchw(page);
for (loop = 0; loop < nr_pages; loop++) {
struct page *p = &page[loop];
if (loop + 1 < (1 << order))
prefetchw(p + 1);
__ClearPageReserved(p);
set_page_count(p, 0);
}
set_page_refcounted(page);
__free_pages(page, order);
if (loop + 1 < nr_pages)
prefetchw(p + 1);
__ClearPageReserved(p);
set_page_count(p, 0);
}
set_page_refcounted(page);
__free_pages(page, order);
}