[PATCH] selftests: timers: raw_skew: initialize mon

[PATCH] selftests: timers: raw_skew: initialize mon

[Sasha Levin]

gcc 16 doesn't see that get_monotonic_and_raw() always sets *mon, as
the first iteration of its loop takes the diff == 0 branch, and warns
once the function is inlined into main():

  raw_skew.c:46:26: warning: '*(__time_t *)((char *)&mon + offsetof(struct timespec, tv_sec))' may be used uninitialized [-Wmaybe-uninitialized]

Initialize mon to quiet it.

Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Found with gcc 16.2; gcc 14 and 15 and clang 21 don't warn.

 tools/testing/selftests/timers/raw_skew.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index dfca3e2d50d2e..ec9e5b2691c94 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -89,7 +89,7 @@ void get_monotonic_and_raw(struct timespec *mon, struct timespec *raw)
 
 int main(int argc, char **argv)
 {
-	struct timespec mon, raw, start, end;
+	struct timespec mon = {}, raw, start, end;
 	long long delta1, delta2, interval, eppm, ppm;
 	long tick_nom;
 	struct timex tx1, tx2;
-- 
2.53.0

[tip: timers/core] selftests: timers: raw_skew: Initialize mon

[tip-bot2 for Sasha Levin]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     c280328a7b02d751b9686156d80de4d2eea0b0a1
Gitweb:        https://git.kernel.org/tip/c280328a7b02d751b9686156d80de4d2eea0b0a1
Author:        Sasha Levin <sashal@kernel.org>
AuthorDate:    Tue, 03 Nov 2026 18:23:06 -05:00
Committer:     Thomas Gleixner <tglx@kernel.org>
CommitterDate: Mon, 09 Nov 2026 20:21:47 +01:00

selftests: timers: raw_skew: Initialize mon

gcc 16 doesn't see that get_monotonic_and_raw() always sets *mon, as
the first iteration of its loop takes the diff == 0 branch, and warns
once the function is inlined into main():

  raw_skew.c:46:26: warning: '*(__time_t *)((char *)&mon + offsetof(struct timespec, tv_sec))' may be used uninitialized [-Wmaybe-uninitialized]

Initialize mon to quiet it.

Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20261103232307.1924618-2-sashal@kernel.org
---
 tools/testing/selftests/timers/raw_skew.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index a61f6a0..5f43b03 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -91,7 +91,7 @@ void get_monotonic_and_raw(struct timespec *mon, struct timespec *raw)
 
 int main(int argc, char **argv)
 {
-	struct timespec mon, raw, start, end;
+	struct timespec mon = {}, raw, start, end;
 	long long delta1, delta2, interval, eppm, ppm;
 	long tick_nom;
 	struct timex tx1, tx2;