diff options
| author | Chen Gang <xili_gchen_5257@hotmail.com> | 2016-01-14 15:18:33 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-21 09:21:22 +0100 |
| commit | a904ebe92a05dd86517b93bad062076e38890788 (patch) | |
| tree | 8bb6690f92e2bfd66055da28c3b95bd7c1648ec7 /include/asm-generic | |
| parent | 7f5eb098ef9590db1998b827a38729daf9d35731 (diff) | |
mm: add PHYS_PFN, use it in __phys_to_pfn()
commit 8f235d1a3eb7198affe7cadf676a10afb8a46a1a upstream.
__phys_to_pfn and __pfn_to_phys are symmetric, PHYS_PFN and PFN_PHYS are
semmetric:
- y = (phys_addr_t)x << PAGE_SHIFT
- y >> PAGE_SHIFT = (phys_add_t)x
- (unsigned long)(y >> PAGE_SHIFT) = x
[akpm@linux-foundation.org: use macro arg name `x']
[arnd@arndb.de: include linux/pfn.h for PHYS_PFN definition]
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marcin Nowakowski <marcin.nowakowski@mips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/memory_model.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h index 4b4b056a6eb0..5148150cc80b 100644 --- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -1,6 +1,8 @@ #ifndef __ASM_MEMORY_MODEL_H #define __ASM_MEMORY_MODEL_H +#include <linux/pfn.h> + #ifndef __ASSEMBLY__ #if defined(CONFIG_FLATMEM) @@ -72,7 +74,7 @@ /* * Convert a physical address to a Page Frame Number and back */ -#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) +#define __phys_to_pfn(paddr) PHYS_PFN(paddr) #define __pfn_to_phys(pfn) PFN_PHYS(pfn) #define page_to_pfn __page_to_pfn |