From 257224b0cdbb5ae1ac463a6a6645e033882b967e Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 12 Dec 2014 02:33:48 +0100
Subject: util: document why we have alloca_align()

---
 src/shared/util.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/shared/util.h b/src/shared/util.h
index a15ce95a65..9a878ca1ac 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -883,6 +883,7 @@ int unlink_noerrno(const char *path);
                 (void *) memset(_new_, 0, _len_);       \
         })
 
+/* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
 #define alloca_align(size, align)                                       \
         ({                                                              \
                 void *_ptr_;                                            \
-- 
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