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Piccoli" , Arnd Bergmann , Kefeng Wang , Uros Bizjak Subject: [PATCH printk v2 24/26] panic: Mark emergency section in oops Date: Sun, 18 Feb 2024 20:03:24 +0106 Message-Id: <20240218185726.1994771-25-john.ogness@linutronix.de> In-Reply-To: <20240218185726.1994771-1-john.ogness@linutronix.de> References: <20240218185726.1994771-1-john.ogness@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1791264500768819036 X-GMAIL-MSGID: 1791264500768819036 Mark an emergency section beginning with oops_enter() until the end of oops_exit(). In this section, the CPU will not perform console output for the printk() calls. Instead, a flushing of the console output is triggered when exiting the emergency section. The very end of oops_exit() performs a kmsg_dump(). This is not included in the emergency section because it is another flushing mechanism that should occur after the consoles have been triggered to flush. Signed-off-by: John Ogness --- kernel/panic.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/panic.c b/kernel/panic.c index d30d261f9246..9fa44bc38f46 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -634,6 +634,7 @@ bool oops_may_print(void) */ void oops_enter(void) { + nbcon_cpu_emergency_enter(); tracing_off(); /* can't trust the integrity of the kernel anymore: */ debug_locks_off(); @@ -656,6 +657,7 @@ void oops_exit(void) { do_oops_enter_exit(); print_oops_end_marker(); + nbcon_cpu_emergency_exit(); kmsg_dump(KMSG_DUMP_OOPS); }