From c1ce4b375fa7b76d8b553d4f8d6cc5a09f063691 Mon Sep 17 00:00:00 2001 From: Xishi Qiu Date: Tue, 12 Nov 2013 15:07:13 -0800 Subject: [PATCH] mm/arch: use __free_reserved_page() to simplify the code 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 Cc: James Hogan Cc: Michal Simek Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/metag/kernel/dma.c | 4 +--- arch/microblaze/mm/consistent.c | 7 ++----- arch/powerpc/mm/dma-noncoherent.c | 4 +--- 3 files changed, 4 insertions(+), 11 deletions(-) diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c index 8c00dedadc54..db589ad5dbc4 100644 --- a/arch/metag/kernel/dma.c +++ b/arch/metag/kernel/dma.c @@ -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; } } diff --git a/arch/microblaze/mm/consistent.c b/arch/microblaze/mm/consistent.c index 5226b09cbbb2..dbbf2246a260 100644 --- a/arch/microblaze/mm/consistent.c +++ b/arch/microblaze/mm/consistent.c @@ -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; diff --git a/arch/powerpc/mm/dma-noncoherent.c b/arch/powerpc/mm/dma-noncoherent.c index 6747eece84af..7b6c10750179 100644 --- a/arch/powerpc/mm/dma-noncoherent.c +++ b/arch/powerpc/mm/dma-noncoherent.c @@ -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; -- 2.30.2