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| author | Mark Salter <msalter@redhat.com> | 2011-10-04 15:24:15 +0200 |
|---|---|---|
| committer | Mark Salter <msalter@redhat.com> | 2011-10-07 01:47:16 +0200 |
| commit | b7a0556e0f2d6946a57f993c6d1043cf065ccfa8 (patch) | |
| tree | 3aaef3ec59cff7cfb58ef6f9905792c2a5644603 /include/asm-generic/page.h | |
| parent | fix default __strnlen_user macro (diff) | |
| download | linux-b7a0556e0f2d6946a57f993c6d1043cf065ccfa8.tar.xz linux-b7a0556e0f2d6946a57f993c6d1043cf065ccfa8.zip | |
fixed generic page.h for non-zero PAGE_OFFSET
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 <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/page.h')
| -rw-r--r-- | 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 75fec18cdc59..f376db24c4a6 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)) |