From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 2D1166B016A for ; Tue, 23 Aug 2011 03:04:53 -0400 (EDT) From: Sonic Zhang Subject: [PATCH] mm:page.h: Calculate virt_to_page and page_to_virt via predefined macro. Date: Tue, 23 Aug 2011 14:58:26 +0800 Message-ID: <1314082706-11352-1-git-send-email-sonic.adi@gmail.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, LKML Cc: uclinux-dist-devel@blackfin.uclinux.org, Sonic Zhang From: Sonic Zhang In NOMMU architecture, 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 --- include/asm-generic/page.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h index 75fec18..96a1dc3 100644 --- a/include/asm-generic/page.h +++ b/include/asm-generic/page.h @@ -79,8 +79,13 @@ extern unsigned long memory_end; #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) +#if 0 #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) +#endif +#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) -- 1.7.0.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org