From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 12 Dec 2014 01:33:48 +0000 (+0100)
Subject: util: document why we have alloca_align()
X-Git-Tag: v219~1040
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=257224b0cdbb5ae1ac463a6a6645e033882b967e

util: document why we have alloca_align()
---

diff --git a/src/shared/util.h b/src/shared/util.h
index a15ce95a6..9a878ca1a 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_;                                            \