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mm/arch: use __free_reserved_page() to simplify the code

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Use __free_reserved_page() to simplify the code in arch.

It used split_page() in consistent_alloc()/__dma_alloc_coherent()/dma_alloc_coherent(),
so page->_count == 1, and we can free it safely.

__free_reserved_page()
	ClearPageReserved()
	init_page_count()  // it won't change the value
	__free_page()

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xishi Qiu 2013-11-12 15:07:13 -08:00 committed by Linus Torvalds
parent 9e4be4708e
commit c1ce4b375f
3 changed files with 4 additions and 11 deletions
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4
arch/metag/kernel/dma.c
View File

@ -305,9 +305,7 @@ void dma_free_coherent(struct device *dev, size_t size,
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
ClearPageReserved(page);
__free_page(page);
__free_reserved_page(page);
continue;
}
}

7
arch/microblaze/mm/consistent.c
View File

@ -176,8 +176,7 @@ void consistent_free(size_t size, void *vaddr)
page = virt_to_page(vaddr);
do {
ClearPageReserved(page);
__free_page(page);
__free_reserved_page(page);
page++;
} while (size -= PAGE_SIZE);
#else
@ -194,9 +193,7 @@ void consistent_free(size_t size, void *vaddr)
pte_clear(&init_mm, (unsigned int)vaddr, ptep);
if (pfn_valid(pfn)) {
page = pfn_to_page(pfn);
ClearPageReserved(page);
__free_page(page);
__free_reserved_page(page);
}
}
vaddr += PAGE_SIZE;

4
arch/powerpc/mm/dma-noncoherent.c
View File

@ -287,9 +287,7 @@ void __dma_free_coherent(size_t size, void *vaddr)
pte_clear(&init_mm, addr, ptep);
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
ClearPageReserved(page);
__free_page(page);
__free_reserved_page(page);
}
}
addr += PAGE_SIZE;