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authorJohannes Weiner <hannes@cmpxchg.org>2012-01-10 15:08:10 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:44 -0800
commitc3993076f842de3754360e5b998d6657a9d30303 (patch)
tree78c1ca3d031483932e2f236706b20064742c0b0c /mm/page_alloc.c
parent43d2b113241d6797b890318767e0af78e313414b (diff)
downloadop-kernel-dev-c3993076f842de3754360e5b998d6657a9d30303.zip
op-kernel-dev-c3993076f842de3754360e5b998d6657a9d30303.tar.gz
mm: page_alloc: generalize order handling in __free_pages_bootmem()
__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 <hannes@cmpxchg.org> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c33
1 files changed, 12 insertions, 21 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 59153da..794e671 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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;
-
- prefetchw(page);
- for (loop = 0; loop < (1 << order); loop++) {
- struct page *p = &page[loop];
+ unsigned int nr_pages = 1 << order;
+ unsigned int loop;
- if (loop + 1 < (1 << order))
- prefetchw(p + 1);
- __ClearPageReserved(p);
- set_page_count(p, 0);
- }
+ prefetchw(page);
+ for (loop = 0; loop < nr_pages; loop++) {
+ struct page *p = &page[loop];
- 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);
}
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