Commit 335e52c2 authored by David Gow's avatar David Gow Committed by Richard Weinberger
Browse files

mm: Add PAGE_ALIGN_DOWN macro 



This is just the same as PAGE_ALIGN(), but rounds the address down, not
up.

Suggested-by: default avatarDmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarDavid Gow <davidgow@google.com>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 9e70cbd1

include/linux/mm.h

+3 −0
Original line number Diff line number Diff line
@@ -221,6 +221,9 @@ int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, 
/* to align the pointer to the (next) page boundary */

#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)



/* to align the pointer to the (prev) page boundary */

#define PAGE_ALIGN_DOWN(addr) ALIGN_DOWN(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)