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From: "Paul E. McKenney" <paulmck@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: gwml@vger.gnuweeb.org,
kernel-team@fb.com,
w@lwt.eu,
Willy Tarreau <w@1wt.eu>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH nolibc 08/18] selftests/nolibc: exit with poweroff on success when getpid() == 1
Date: Wed, 31 Aug 2022 11:21:38 -0700
Message-Id: <20220831182148.2698489-10-paulmck@kernel.org>
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From: Willy Tarreau <w@1wt.eu>
The idea is to ease automated testing under qemu. If the test succeeds
while running as PID 1, indicating the system was booted with init=/test,
let's just power off so that qemu can exit with a successful code. In
other situations it will exit and provoke a panic, which may be caught
for example with CONFIG_PVPANIC.
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
tools/testing/selftests/nolibc/nolibc-test.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index b928f099431f7..291d96bfd7c12 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -626,6 +626,20 @@ int main(int argc, char **argv, char **envp)
}
printf("Total number of errors: %d\n", ret);
+
+ if (getpid() == 1) {
+ /* we're running as init, there's no other process on the
+ * system, thus likely started from a VM for a quick check.
+ * Exiting will provoke a kernel panic that may be reported
+ * as an error by Qemu or the hypervisor, while stopping
+ * cleanly will often be reported as a success. This allows
+ * to use the output of this program for bisecting kernels.
+ */
+ printf("Leaving init with final status: %d\n", !!ret);
+ if (ret == 0)
+ reboot(LINUX_REBOOT_CMD_POWER_OFF);
+ }
+
printf("Exiting with status %d\n", !!ret);
return !!ret;
}
--
2.31.1.189.g2e36527f23