linux-kernel - [PATCH v2 6/9] selftests/mm: Print some details when uffd-stress gets bad params

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Message-ID: <20250221-mm-selftests-v2-6-28c4d66383c5@google.com>
Date: Fri, 21 Feb 2025 18:25:45 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Shuah Khan <shuah@...nel.org>
Cc: Dev Jain <dev.jain@....com>, linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Brendan Jackman <jackmanb@...gle.com>
Subject: [PATCH v2 6/9] selftests/mm: Print some details when uffd-stress gets
 bad params

So this can be debugged more easily.

Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
---
 tools/testing/selftests/mm/uffd-stress.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
index ec842bbb9f18e291fa51de0ed8d1fbf9aaf14372..be0c93f24fccd618f52d54ff36d9a5540f420e46 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -456,7 +456,8 @@ int main(int argc, char **argv)
 
 	nr_pages_per_cpu = bytes / page_size / nr_threads;
 	if (!nr_pages_per_cpu) {
-		_err("invalid MiB");
+		_err("pages_per_cpu = 0, cannot test (%lu / %lu / %lu)",
+			nr_pages_per_cpu, bytes, page_size, nr_threads);
 		usage();
 	}
 

-- 
2.48.1.601.g30ceb7b040-goog