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Subject[PATCH v2 1/2] mm: Add PAGE_ALIGN_DOWN macro
From
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>
---

Note: there is no v1 of this patch, it's just part of v2 of the
UML/KASAN series.

There are almost certainly lots of places where this macro should be
used: just look for ALIGN_DOWN(..., PAGE_SIZE). I haven't gone through
to try to replace them all.

---
include/linux/mm.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index e34edb775334..e68731f0ef20 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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)

--
2.36.1.124.g0e6072fb45-goog
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