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Thu, 16 Jan 2025 01:29:48 -0800 (PST) Date: Thu, 16 Jan 2025 10:29:46 +0100 From: Petr Mladek To: Madhavan Srinivasan Cc: jikos@kernel.org, mbenes@suse.cz, joe.lawrence@redhat.com, shuah@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, naveen@kernel.org, live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH] selftests: livepatch: handle PRINTK_CALLER in check_result() Message-ID: References: <20250114143144.164250-1-maddy@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250114143144.164250-1-maddy@linux.ibm.com> On Tue 2025-01-14 20:01:44, Madhavan Srinivasan wrote: > Some arch configs (like ppc64) enable CONFIG_PRINTK_CALLER, which > adds the caller id as part of the dmesg. Due to this, even though > the expected vs observed are same, end testcase results are failed. CONFIG_PRINTK_CALLER is not the only culprit. We (SUSE) have it enabled as well and the selftests pass without this patch. The difference might be in dmesg. It shows the caller only when the messages are read via the syslog syscall (-S) option. It should not show the caller when the messages are read via /dev/kmsg which should be the default. I wonder if you define an alias to dmesg which adds the "-S" option or if /dev/kmsg is not usable from some reason. That said, I am fine with the patch. But I would like to better understand and document why you need it. Also it would be nice to update the filter format as suggested by Joe. Best Regards, Petr