From f424f5b774b7cb0fd7939d28e68db6fa977baea1 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.i.king@gmail.com>
Date: Mon, 21 Nov 2022 12:45:11 +0000
Subject: [PATCH 2/3] stress-shm: skip stressor if /dev/shm is not mounted with
 tmpfs on linux

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 stress-shm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/stress-shm.c b/stress-shm.c
index 91bcd961aeb1..4e6327ac97d4 100644
--- a/stress-shm.c
+++ b/stress-shm.c
@@ -122,6 +122,18 @@ static int stress_shm_posix_child(
 	const size_t page_size = args->page_size;
 	struct sigaction sa;
 
+#if defined(__linux__)
+	/*
+	 *  /dev/shm should be mounted with tmpfs and
+	 *  be writeable, if not shm_open will fail
+	 */
+	if (access("/dev/shm", W_OK) < 0) {
+		pr_inf("%s: cannot access /dev/shm for writes, errno=%d (%s) skipping stressor\n",
+			args->name, errno, strerror(errno));
+		return EXIT_NO_RESOURCE;
+	}
+#endif
+
 	addrs = calloc(shm_posix_objects, sizeof(*addrs));
 	if (!addrs) {
 		pr_fail("%s: calloc on addrs failed, out of memory\n", args->name);
-- 
2.38.1