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[73.69.118.222]) by smtp.gmail.com with ESMTPSA id x7sm2122407qkx.36.2020.05.05.08.45.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2020 08:45:14 -0700 (PDT) From: Pavel Tatashin To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org, linux-kernel@vger.kernel.org, pmladek@suse.com, sergey.senozhatsky@gmail.com, rostedt@goodmis.org, keescook@chromium.org, anton@enomsg.org, ccross@android.com, tony.luck@intel.com, robh+dt@kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 2/5] pstore/platform: pass max_reason to kmesg dump Date: Tue, 5 May 2020 11:45:07 -0400 Message-Id: <20200505154510.93506-3-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200505154510.93506-1-pasha.tatashin@soleen.com> References: <20200505154510.93506-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a new field to pstore_info that passes information about kmesg dump maximum reason. This allows a finer control of what kmesg dumps are stored on pstore device. Those clients that do not explicitly set this field (keep it equal to 0), get the default behavior: dump only Oops and Panics, and dump everything if printk.always_kmsg_dump is provided. Signed-off-by: Pavel Tatashin --- fs/pstore/platform.c | 4 +++- include/linux/pstore.h | 3 +++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 408277ee3cdb..75bf8a43f92a 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -602,8 +602,10 @@ int pstore_register(struct pstore_info *psi) if (pstore_is_mounted()) pstore_get_records(0); - if (psi->flags & PSTORE_FLAGS_DMESG) + if (psi->flags & PSTORE_FLAGS_DMESG) { + pstore_dumper.max_reason = psinfo->max_reason; pstore_register_kmsg(); + } if (psi->flags & PSTORE_FLAGS_CONSOLE) pstore_register_console(); if (psi->flags & PSTORE_FLAGS_FTRACE) diff --git a/include/linux/pstore.h b/include/linux/pstore.h index e779441e6d26..45ae424bfeb5 100644 --- a/include/linux/pstore.h +++ b/include/linux/pstore.h @@ -97,6 +97,8 @@ struct pstore_record { * @read_mutex: serializes @open, @read, @close, and @erase callbacks * @flags: bitfield of frontends the backend can accept writes for * @data: backend-private pointer passed back during callbacks + * @max_reason: Used when PSTORE_FLAGS_DMESG is set. Contains the + * kmsg_dump_reason enum value. * * Callbacks: * @@ -180,6 +182,7 @@ struct pstore_info { int flags; void *data; + int max_reason; int (*open)(struct pstore_info *psi); int (*close)(struct pstore_info *psi); -- 2.25.1