From 06d5e032adcbc7d50c606a1396f00e2474e4213e Mon Sep 17 00:00:00 2001 From: Sonic Zhang Date: Mon, 31 Oct 2011 17:08:31 -0700 Subject: [PATCH] include/asm-generic/page.h: calculate virt_to_page and page_to_virt via predefined macro On NOMMU architectures, if physical memory doesn't start from 0, ARCH_PFN_OFFSET is defined to generate page index in mem_map array. Because virtual address is equal to physical address, PAGE_OFFSET is always 0. virt_to_page and page_to_virt should not index page by PAGE_OFFSET directly. Signed-off-by: Sonic Zhang Cc: Greg Ungerer Cc: Geert Uytterhoeven Cc: David Howells Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/page.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h index 75fec18cdc5..351889d1de1 100644 --- a/include/asm-generic/page.h +++ b/include/asm-generic/page.h @@ -79,8 +79,8 @@ extern unsigned long memory_end; #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) -#define virt_to_page(addr) (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)) -#define page_to_virt(page) ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) +#define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) +#define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) #ifndef page_to_phys #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) -- 2.20.1