From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-6.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gnuweeb.org (Postfix) with ESMTPS id 738ED80BB3 for ; Wed, 31 Aug 2022 18:21:52 +0000 (UTC) Authentication-Results: gnuweeb.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=sKiFWYHW; dkim-atps=neutral Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BC1BA61CEA; Wed, 31 Aug 2022 18:21:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D974C4314B; Wed, 31 Aug 2022 18:21:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1661970110; bh=fmmGXrtft4WY+vYxlsPoch8NfKf9311WO6goU05GNWY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sKiFWYHWw3ttCgjlsyc2E1INvfoTWR9OpKuHkufgBVo5RJr1haye3k19z1zICIyDb Y45L3NkcrTYqzl/LkYwzg5PEUkYcD805Z7uE2apsuloFYftTH4YQzhM7j/d3XNuoeg MfL5xtC8p0wpAAX4Fs3nPbsVNVt7zWosCh7uyJS3Fad2BLZJWZokgEL4qUOSu70PDc 9RUgK9CLEwMyHj5aXhhiZSORjNQ6LdA+Kve3cAd59VQudoFtoQJ0AxO0HHReRvjiHM 2fuvLc4A7HqzuLtjUP63Xr8qhwsDIrDvVXgVDm0GuyUcYzk23lmoSRE2BdoTjM/Pr/ fdcXIe0stWfYA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id E09525C0A6B; Wed, 31 Aug 2022 11:21:49 -0700 (PDT) From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: gwml@vger.gnuweeb.org, kernel-team@fb.com, w@lwt.eu, Willy Tarreau , "Paul E . McKenney" 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> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20220831182113.GA2697286@paulmck-ThinkPad-P17-Gen-1> References: <20220831182113.GA2697286@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-Id: From: Willy Tarreau 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 Signed-off-by: Paul E. McKenney --- 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