A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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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 <[email protected]>
Cc: Russell King <[email protected]>
Cc: David Howells <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mundt <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Chris Zankel <[email protected]>
Signed-off-by: Yoichi Yuasa <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2006-03-22 00:08:05 -08:00 • committed by Linus Torvalds
commit 8dfcc9ba27
9 changed files with 41 additions and 21 deletions
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4
arch/ppc/kernel/dma-mapping.c
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@ -223,6 +223,8 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr);
struct page *end = page + (1 << order);
split_page(page, order);
/*
* Set the "dma handle"
*/
@ -231,7 +233,6 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
do {
BUG_ON(!pte_none(*pte));
set_page_count(page, 1);
SetPageReserved(page);
set_pte_at(&init_mm, vaddr,
pte, mk_pte(page, pgprot_noncached(PAGE_KERNEL)));
@ -244,7 +245,6 @@ __dma_alloc_coherent(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++;
}