From 7efe2c6c973ee40e77c07402b6bf28e4d2d11384 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 10 Mar 2020 18:01:01 +0100
Subject: [PATCH] shm: try to mmap with MAP_UNINITIALIZED

This flag is expected to be ignored on most systems, but can't hurt to
try.
---
 shm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/shm.c b/shm.c
index 71f964a8..ba88b361 100644
--- a/shm.c
+++ b/shm.c
@@ -6,6 +6,7 @@
 
 #include <sys/types.h>
 #include <sys/mman.h>
+#include <linux/mman.h>
 #include <linux/memfd.h>
 #include <fcntl.h>
 
@@ -142,7 +143,7 @@ shm_get_buffer(struct wl_shm *shm, int width, int height, unsigned long cookie)
         }
     }
 
-    mmapped = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, pool_fd, 0);
+    mmapped = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_UNINITIALIZED, pool_fd, 0);
     if (mmapped == MAP_FAILED) {
         LOG_ERRNO("failed to mmap SHM backing memory file");
         goto err;