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include/linux/mm.h: add PAGE_ALIGNED() helper 

To test whether an address is aligned to PAGE_SIZE.

Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2013-07-03 15:02:11 -07:00 committed by Linus Torvalds
parent d702909f0a
commit 0fa73b86ef
1 changed files with 3 additions and 0 deletions
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include/linux/mm.h
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@ -52,6 +52,9 @@ extern unsigned long sysctl_admin_reserve_kbytes;
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
/* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
#define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
/*
* Linux kernel virtual memory manager primitives.
* The idea being to have a "virtual" mm in the same way