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([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-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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); int kmsg_dump_unregister(struct kmsg_dumper *dumper); +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_dumper *dumper) return -EINVAL; } +static inline void kmsg_kmemdump_register(void) +{ +} + static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason) { 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 #include #include @@ -4650,6 +4651,18 @@ int kmsg_dump_register(struct kmsg_dumper *dumper) } EXPORT_SYMBOL_GPL(kmsg_dump_register); +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 -- 2.43.0