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mm: Add PAGE_ALIGN_DOWN macro

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

Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
David Gow 2022-07-01 17:16:19 +08:00 committed by Richard Weinberger
parent 9e70cbd11b
commit 335e52c28c
1 changed files with 3 additions and 0 deletions
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include/linux/mm.h
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@ -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)