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Thu, 23 Jan 2020 16:00:43 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id D9995C447A1; Thu, 23 Jan 2020 16:00:42 +0000 (UTC) Received: from blr-ubuntu-253.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 63103C43383; Thu, 23 Jan 2020 16:00:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 63103C43383 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=saiprakash.ranjan@codeaurora.org From: Sai Prakash Ranjan To: Kees Cook , Anton Vorontsov , Colin Cross , Tony Luck , Joel Fernandes Subject: [PATCH] pstore: Fix printing of duplicate boot messages to console Date: Thu, 23 Jan 2020 21:30:31 +0530 Message-Id: <20200123160031.9853-1-saiprakash.ranjan@codeaurora.org> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200123_080051_634509_A093F8FC X-CRM114-Status: GOOD ( 14.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sai Prakash Ranjan , linux-arm-msm@vger.kernel.org, Douglas Anderson , linux-kernel@vger.kernel.org, Matthias Kaehlcke , Stephen Boyd , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Since commit f92b070f2dc8 ("printk: Do not miss new messages when replaying the log"), CON_PRINTBUFFER flag causes the duplicate boot messages to be printed on the console when PSTORE_CONSOLE and earlycon (boot console) is enabled. Pstore console registers to boot console when earlycon is enabled during pstore_register_console as a part of ramoops initialization in postcore_initcall and the printk core checks for CON_PRINTBUFFER flag and replays the log buffer to registered console (in this case pstore console which just registered to boot console) causing duplicate messages to be printed. Remove the CON_PRINTBUFFER flag from pstore console since pstore is not concerned with the printing of buffer to console but with writing of the buffer to the backend. Console log with earlycon and pstore console enabled: [ 0.008342] Console: colour dummy device 80x25 [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x51df805e] ... [ 1.244049] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers. [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x51df805e] Fixes: f92b070f2dc8 ("printk: Do not miss new messages when replaying the log") Reported-by: Douglas Anderson Signed-off-by: Sai Prakash Ranjan --- fs/pstore/platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index d896457e7c11..271b00db0973 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -505,7 +505,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) static struct console pstore_console = { .name = "pstore", .write = pstore_console_write, - .flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME, + .flags = CON_ENABLED | CON_ANYTIME, .index = -1, }; -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel