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([82.76.24.202]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-abb8b1767e8sm308583266b.174.2025.02.17.02.17.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Feb 2025 02:17:57 -0800 (PST) From: Eugen Hristev To: linux-arm-msm@vger.kernel.org, linux-hardening@vger.kernel.org, kees@kernel.org Cc: linux-kernel@vger.kernel.org, johannes@sipsolutions.net, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, andersson@kernel.org, konradybcio@kernel.org, tony.luck@intel.com, gpiccoli@igalia.com, pmladek@suse.com, rostedt@goodmis.org, john.ogness@linutronix.de, senozhatsky@chromium.org, quic_mojha@quicinc.com, linux-arm-kernel@lists.infradead.org, kernel@quicinc.com, Eugen Hristev Subject: [RFC][PATCH 08/10] pstore: register kmsg into directly mapped zones if available Date: Mon, 17 Feb 2025 12:17:04 +0200 Message-ID: <20250217101706.2104498-9-eugen.hristev@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250217101706.2104498-1-eugen.hristev@linaro.org> References: <20250217101706.2104498-1-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: 8bit If dmapped zones are available, register the log buffer into one zone. Signed-off-by: Eugen Hristev --- fs/pstore/platform.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 32448d9dd316..9a5c1d6d5031 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -452,11 +452,22 @@ static void pstore_register_kmsg(void) kmsg_dump_register(&pstore_dumper); } +static int pstore_register_kmsg_dmapped(void) +{ + return pstore_register_core_area("dmesg", log_buf_addr_get(), + log_buf_len_get()); +} + static void pstore_unregister_kmsg(void) { kmsg_dump_unregister(&pstore_dumper); } +static int pstore_unregister_kmsg_dmapped(void) +{ + return pstore_unregister_core_area("dmesg", log_buf_addr_get(), + log_buf_len_get()); +} #ifdef CONFIG_PSTORE_CONSOLE static void pstore_console_write(struct console *con, const char *s, unsigned c) { @@ -582,6 +593,9 @@ int pstore_register(struct pstore_info *psi) pstore_dumper.max_reason = psinfo->max_reason; pstore_register_kmsg(); } + if (psi->flags & PSTORE_FLAGS_DMAPPED) + if (pstore_register_kmsg_dmapped()) + pr_warn("Registering kmsg as dmapped failed.\n"); if (psi->flags & PSTORE_FLAGS_CONSOLE) pstore_register_console(); if (psi->flags & PSTORE_FLAGS_FTRACE) @@ -628,6 +642,8 @@ void pstore_unregister(struct pstore_info *psi) pstore_unregister_console(); if (psi->flags & PSTORE_FLAGS_DMESG) pstore_unregister_kmsg(); + if (psi->flags & PSTORE_FLAGS_DMAPPED) + pstore_unregister_kmsg_dmapped(); /* Stop timer and make sure all work has finished. */ del_timer_sync(&pstore_timer); -- 2.43.0