From: Xiaoming Ni <nixiaoming@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-leds@vger.kernel.org>,
<pavel@ucw.cz>, <dmurphy@ti.com>, <akpm@linux-foundation.org>,
<keescook@chromium.org>, <gpiccoli@canonical.com>,
<penguin-kernel@i-love.sakura.ne.jp>
Cc: <nixiaoming@huawei.com>, <wangle6@huawei.com>
Subject: [PATCH 1/4] panic: Add new API is_being_panic()
Date: Fri, 18 Dec 2020 19:44:03 +0800 [thread overview]
Message-ID: <20201218114406.61906-2-nixiaoming@huawei.com> (raw)
In-Reply-To: <20201218114406.61906-1-nixiaoming@huawei.com>
Add is_being_panic() to check whether the system is in panic state.
Used to replace the global variable used to determine the panic status
in other features: hung_task ledtrig-activity ledtrig-heartbeat
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
---
include/linux/kernel.h | 1 +
kernel/panic.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f7902d8c1048..3d6f344771c1 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -167,6 +167,7 @@ void __might_fault(const char *file, int line);
static inline void might_fault(void) { }
#endif
+extern bool is_being_panic(void);
extern struct atomic_notifier_head panic_notifier_list;
extern long (*panic_blink)(int state);
__printf(1, 2)
diff --git a/kernel/panic.c b/kernel/panic.c
index 332736a72a58..3b6a487702b0 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -125,6 +125,12 @@ void __weak crash_smp_send_stop(void)
atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
+bool is_being_panic(void)
+{
+ return (atomic_read(&panic_cpu) != PANIC_CPU_INVALID);
+}
+EXPORT_SYMBOL(is_being_panic);
+
/*
* A variant of panic() called from NMI context. We return if we've already
* panicked on this CPU. If another CPU already panicked, loop in
--
2.27.0
next prev parent reply other threads:[~2020-12-18 11:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 11:44 [PATCH 0/4] Add new API is_being_panic() Xiaoming Ni
2020-12-18 11:44 ` Xiaoming Ni [this message]
2020-12-18 11:44 ` [PATCH 2/4] hung_task: Replace "did_panic" with is_be_panic() Xiaoming Ni
2020-12-18 12:59 ` Pavel Machek
2020-12-18 14:36 ` Tetsuo Handa
2020-12-18 17:06 ` Randy Dunlap
2020-12-20 2:58 ` Xiaoming Ni
2020-12-18 11:44 ` [PATCH 3/4] leds:trigger:ledtrig-activity Replace "panic_detected" " Xiaoming Ni
2020-12-18 11:44 ` [PATCH 4/4] leds:trigger:ledtrig-heartbeat: Replace "panic_heartbeats" " Xiaoming Ni
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