From nobody Mon Feb 9 17:23:11 2026 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5786427D771 for ; Tue, 22 Apr 2025 11:32:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745321544; cv=none; b=Js/ceUNBUBmO6kXIQACVWk5MhyKes0UHmycY9U5eb+JziTf0mX7xf2MWhLI8pI9k2JoT3rG1XTlLr2Lp5LG6SUzaZ8jd7e98icII0IuNS3FBWO31h7lrmQOirCImtitcqwMQRC74uMKXvSmTaGHfpxDyxG38pC0bXKwpM6O8Qkc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745321544; c=relaxed/simple; bh=ZEfuO89SqASiM7GrCPCbp+s2T96g+unLkUU0ynS0zgo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ghhkVHdTIC6VS6vkVURqaTPrhc8UtREhXF14nXM3GsrOrdg6iqvC4GHnNX6zAQHOr7eYMd35jK/8AytoKFS5+LYN/UFmpryw4VoTxhGPfTMeTXgLvydWBIPxSRGRWiMFQTzab/bv8JjsvIuM8iTB7shKHpLjFl1RZGKeWXZcEm4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=GU7LQMgm; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="GU7LQMgm" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-43cf06eabdaso48339335e9.2 for ; Tue, 22 Apr 2025 04:32:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1745321541; x=1745926341; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=x9mhCj0ekrSAhKxeAdIDKoiXrDacQrSQO5Vuilr0jZM=; b=GU7LQMgmVIJUSoeSNKjC7TGDQUXttCYFRYCb7dKAB517LiucoTqHa1XD52VppNUgiI k9WitxHy7GgbkMEkvLBQ1Pw4hQpkb0LVC6pxCgoD6n7xlSlepDZLunog2+WIH/HGgwFV LwBxkQzSP5SjEz3RaagwxzxlHJh8oXFcvCosbzmTdlLSVMdEQk92aNWK1z7aISTcENYz dqoMlzowXCbN1kcIcYpeythaRyqehNbVDS/8t2wV9A97vfvyc6jGuTph8ygJxdUFMaBx ub+eohfH4xUBSyvOutGu+E3tE2nKEnXywM5bw+50I+8nxd1Zx6Wx61fznsDgen2/BtWI kaDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1745321541; x=1745926341; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=x9mhCj0ekrSAhKxeAdIDKoiXrDacQrSQO5Vuilr0jZM=; b=QNqfhneS70VtmIR43ALX92CmvuOw9LJakpNT+EmiB3X8gVN4D1a+zNDXnDc2g5QA31 vfGddzQa8Is13IOM8SSpkIajH2KeZaDaa0mA69vb3c2AWsVvXp1RMH+Tgadl5gyrsYLp Y3Wa9krsX4P9B+YX8Gt54PWCvf5xPSOkPk4AbmJQtxGSKEl1KOPbECtiliweQmTp5Snz uU9jD2YYfoJWu1mqZsd6K6KLI7NBvDIh4aujSLjKOG7sXQ2vpTdqKAgAC73Xj76vhy0k YDZ6HxQ+4bgcihajUQ2P6qstk+AB7tKiDXW3UdoVoZjEOjCBvlEHEx0TTrkNgkvo/Ndk KHwg== X-Gm-Message-State: AOJu0YwbZSVgHAP+/8zViIKnLXqxmq8srCGnCRBzywCyV9HIHaIQqCA/ 15qtfhsK/0P3y6Me5C5b8k1VyTZjPGOCUe1hRPPjJwHu71wrnsQ1TmAG+AW8BMKlMUoYgZcSaXD I X-Gm-Gg: ASbGncusQHBwvTaZv2buK/EmEh0GO5ws/T2txVed/Ix2agwEaQf95bKrpiCUBaLrzf4 A7jCGq7PnlqpF9mhBRiwnQm57W+9gq2WMMfTlF3niE5X/qrpAjRBfP8rpAWUFelW+mBNdGI1Rkh OXVDHnyQi9jseEQNY6m7fsnF2OLPw+30U3yPw88k9V+GC9brah4bn9vtDmZpDXl7jERtfUIsQAs fbMlz8a9n5jb/+2k94FfDs2ULaY5s/PvRpRGGMx0b4mOOVX37aBZ5csD1dxqeAFLXC6LX6qqqA7 5OrCqeewNb6s528IkdGQbbgSqr4zB5WtScH2VYq9MVYIyN/Vt07t X-Google-Smtp-Source: AGHT+IETnKdGNbtMn7JPOPRBj99xAT5wJXNpOwUNB001P6TYN6eu4ikfra2LHHxXB1sLzvhGYsSz8g== X-Received: by 2002:a05:6000:1ac9:b0:39b:fa24:950a with SMTP id ffacd0b85a97d-39efbadeb66mr12760697f8f.36.1745321540656; Tue, 22 Apr 2025 04:32:20 -0700 (PDT) Received: from eugen-station.. ([2a02:2f0a:131e:0:1820:da87:73b1:d80c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39efa49312fsm14907887f8f.70.2025.04.22.04.32.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Apr 2025 04:32:20 -0700 (PDT) From: Eugen Hristev To: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, andersson@kernel.org Cc: linux-doc@vger.kernel.org, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, rostedt@goodmis.org, john.ogness@linutronix.de, senozhatsky@chromium.org, pmladek@suse.com, peterz@infradead.org, mojha@qti.qualcomm.com, linux-arm-kernel@lists.infradead.org, vincent.guittot@linaro.org, konradybcio@kernel.org, dietmar.eggemann@arm.com, juri.lelli@redhat.com, eugen.hristev@linaro.org Subject: [RFC][PATCH 07/14] printk: add kmsg_kmemdump_register Date: Tue, 22 Apr 2025 14:31:49 +0300 Message-ID: <20250422113156.575971-8-eugen.hristev@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250422113156.575971-1-eugen.hristev@linaro.org> References: <20250422113156.575971-1-eugen.hristev@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add kmsg_kmemdump_register, which registers prb, log_buf and infos/descs to kmemdump. This will allow kmemdump to be able to dump specific log buffer areas on demand. Signed-off-by: Eugen Hristev --- include/linux/kmsg_dump.h | 6 ++++++ kernel/printk/printk.c | 13 +++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/kmsg_dump.h b/include/linux/kmsg_dump.h index 6055fc969877..cbe76c94710b 100644 --- a/include/linux/kmsg_dump.h +++ b/include/linux/kmsg_dump.h @@ -80,6 +80,8 @@ int kmsg_dump_register(struct kmsg_dumper *dumper); =20 int kmsg_dump_unregister(struct kmsg_dumper *dumper); =20 +void kmsg_kmemdump_register(void); + const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason); #else static inline void kmsg_dump_desc(enum kmsg_dump_reason reason, const char= *desc) @@ -112,6 +114,10 @@ static inline int kmsg_dump_unregister(struct kmsg_dum= per *dumper) return -EINVAL; } =20 +static inline void kmsg_kmemdump_register(void) +{ +} + static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reaso= n) { return "Disabled"; diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 057db78876cd..cf4aa86ef7af 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -48,6 +48,7 @@ #include #include #include +#include =20 #include #include @@ -4650,6 +4651,18 @@ int kmsg_dump_register(struct kmsg_dumper *dumper) } EXPORT_SYMBOL_GPL(kmsg_dump_register); =20 +void kmsg_kmemdump_register(void) +{ + kmemdump_register("log_buf", (void *)log_buf_addr_get(), log_buf_len_get(= )); + kmemdump_register("prb", (void *)&prb, sizeof(prb)); + kmemdump_register("prb", (void *)prb, sizeof(*prb)); + kmemdump_register("prb_descs", (void *)_printk_rb_static_descs, + sizeof(_printk_rb_static_descs)); + kmemdump_register("prb_infos", (void *)_printk_rb_static_infos, + sizeof(_printk_rb_static_infos)); +} +EXPORT_SYMBOL_GPL(kmsg_kmemdump_register); + /** * kmsg_dump_unregister - unregister a kmsg dumper. * @dumper: pointer to the kmsg_dumper structure --=20 2.43.0