diff options
| author | Chen Gang <xili_gchen_5257@hotmail.com> | 2016-01-14 15:18:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-14 16:00:49 -0800 |
| commit | 8f235d1a3eb7198affe7cadf676a10afb8a46a1a (patch) | |
| tree | 78f5ec435417423e50a3a3d59a0af8abbf5cd15c /block/noop-iosched.c | |
| parent | 3aa2385111168187f24a6db04697c6fab0fab9b4 (diff) | |
mm: add PHYS_PFN, use it in __phys_to_pfn()
__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>
Diffstat (limited to 'block/noop-iosched.c')
0 files changed, 0 insertions, 0 deletions