[PATCH 02/24] fixed generic page.h for non-zero PAGE_OFFSET
From: Mark Salter <hidden>
Date: 2011-08-31 21:28:00
Also in:
lkml
Subsystem:
generic include/asm header files, the rest · Maintainers:
Arnd Bergmann, Linus Torvalds
asm-generic/page.h had several problems when used with a non-zero PAGE_OFFSET. This patch adds a default ARCH_PFN_OFFSET and fixes the __va, __pa, and pfn_valid macros to work with non-zero PAGE_OFFSETs. Signed-off-by: Mark Salter <redacted> --- include/asm-generic/page.h | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h
index 75fec18..f376db2 100644
--- a/include/asm-generic/page.h
+++ b/include/asm-generic/page.h@@ -71,10 +71,14 @@ extern unsigned long memory_end; #define PAGE_OFFSET (0) #endif +#ifndef ARCH_PFN_OFFSET +#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) +#endif + #ifndef __ASSEMBLY__ -#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET)) -#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET) +#define __va(x) ((void *)((unsigned long) (x))) +#define __pa(x) ((unsigned long) (x)) #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
@@ -86,7 +90,7 @@ extern unsigned long memory_end; #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) #endif -#define pfn_valid(pfn) ((pfn) < max_mapnr) +#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ ((void *)(kaddr) < (void *)memory_end))
--
1.7.6