From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by e6.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id l4OCD5uj016882 for ; Thu, 24 May 2007 08:13:05 -0400 Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v8.3) with ESMTP id l4OCC3kQ523042 for ; Thu, 24 May 2007 08:12:03 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l4OCC3jp028720 for ; Thu, 24 May 2007 08:12:03 -0400 Date: Thu, 24 May 2007 08:12:03 -0400 From: Dave Kleikamp Message-Id: <20070524121203.13533.30015.sendpatchset@kleikamp.austin.ibm.com> In-Reply-To: <20070524121130.13533.32563.sendpatchset@kleikamp.austin.ibm.com> References: <20070524121130.13533.32563.sendpatchset@kleikamp.austin.ibm.com> Subject: [RFC:PATCH 006/012] Modify lowmem_page_address() & page_to_phys() to special case tail page Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm List-ID: Modify lowmem_page_address() & page_to_phys() to special case tail page Signed-off-by: Dave Kleikamp --- include/asm-powerpc/io.h | 8 +++++++- include/linux/mm.h | 2 ++ 2 files changed, 9 insertions(+), 1 deletion(-) diff -Nurp linux005/include/asm-powerpc/io.h linux006/include/asm-powerpc/io.h --- linux005/include/asm-powerpc/io.h 2007-05-21 15:15:41.000000000 -0500 +++ linux006/include/asm-powerpc/io.h 2007-05-23 22:53:11.000000000 -0500 @@ -19,6 +19,7 @@ extern int check_legacy_ioport(unsigned #define PNPBIOS_BASE 0xf000 #include +#include #include #include #include @@ -702,7 +703,12 @@ static inline void * phys_to_virt(unsign /* * Change "struct page" to physical address. */ -#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) +static inline unsigned long page_to_phys(struct page *page) +{ + if (unlikely(PageFileTail(page))) + return __pa(page->mapping->tail); + return page_to_pfn(page) << PAGE_SHIFT; +} /* We do NOT want virtual merging, it would put too much pressure on * our iommu allocator. Instead, we want drivers to be smart enough diff -Nurp linux005/include/linux/mm.h linux006/include/linux/mm.h --- linux005/include/linux/mm.h 2007-05-21 15:15:44.000000000 -0500 +++ linux006/include/linux/mm.h 2007-05-23 22:53:11.000000000 -0500 @@ -557,6 +557,8 @@ static inline void set_page_links(struct static __always_inline void *lowmem_page_address(struct page *page) { + if (unlikely(PageFileTail(page))) + return page->mapping->tail; return __va(page_to_pfn(page) << PAGE_SHIFT); } -- David Kleikamp IBM Linux Technology Center -- 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/ . Don't email: email@kvack.org