Re: [PATCH v2 3/5] selftests/arm64: Treat KSM merge_across_nodes as optional

On 21/08/2026 4:43 pm, Mark Brown wrote:

On Fri, Aug 21, 2026 at 03:15:51PM +0100, Muhammad Usama Anjum wrote:

quoted

+static bool merge_across_nodes_available(void)
+{
+	const char *path = PATH_KSM "merge_across_nodes";
+
+	if (!access(path, R_OK | W_OK))
+		return true;
+	if (errno == ENOENT)
+		return false;
+
+	ksft_exit_fail_msg("Unable to read and write %s: %s\n", path,
+			   strerror(errno));
+}

If prerequistites for the test aren't available I'd expect this to be a
skip rather than a fail.

You're right. Access to the attribute is a prerequisite rather than the
behavior under test, so I'll report access failures as KSFT_SKIP.

-- 
Thanks,
Usama

-- 
Thanks,
Usama