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[PATCH] mm: split highorder pages

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Have an explicit mm call to split higher order pages into individual pages.
 Should help to avoid bugs and be more explicit about the code's intention.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-03-22 00:08:05 -08:00
committed by Linus Torvalds
parent 8e7a9aae91
commit 8dfcc9ba27
9 changed files with 41 additions and 21 deletions
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4
arch/arm/mm/consistent.c
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@@ -223,6 +223,8 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pte = consistent_pte[idx] + off;
c->vm_pages = page;
split_page(page, order);
/*
* Set the "dma handle"
*/
@@ -231,7 +233,6 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
do {
BUG_ON(!pte_none(*pte));
set_page_count(page, 1);
/*
* x86 does not mark the pages reserved...
*/
@@ -250,7 +251,6 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
* Free the otherwise unused pages.
*/
while (page < end) {
set_page_count(page, 1);
__free_page(page);
page++;
}