From: Chris Down <chris@chrisdown.name>
Date: Thu, 3 Oct 2019 13:41:06 +0000 (+0100)
Subject: memory-util: Add PAGE_ALIGN_DOWN
X-Git-Tag: v244-rc1~224^2~3
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3a6da69a93f599588b9bfaf3bee2c36ec938c9a8;p=thirdparty%2Fsystemd.git

memory-util: Add PAGE_ALIGN_DOWN

For example, cgroup v2 rounds down to the previous page when returning
memory limits.
---

diff --git a/src/basic/memory-util.h b/src/basic/memory-util.h
index 9cb8ac3c10f..46a6907a0cf 100644
--- a/src/basic/memory-util.h
+++ b/src/basic/memory-util.h
@@ -11,6 +11,7 @@
 
 size_t page_size(void) _pure_;
 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
+#define PAGE_ALIGN_DOWN(l) (l & ~(page_size() - 1))
 
 /* Normal memcpy requires src to be nonnull. We do nothing if n is 0. */
 static inline void memcpy_safe(void *dst, const void *src, size_t n) {