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authorJason Baron <jbaron@akamai.com>2013-11-25 23:23:04 +0000
committerIngo Molnar <mingo@kernel.org>2013-11-26 12:12:26 +0100
commit5800dc3cff87c3a1548382298bb16e1fb4ec7e32 (patch)
tree7495d7a91bbac6ab956cb0099ae023deb3a4db76
parentb975dc3689fc6a3718ad288ce080924f9cb7e176 (diff)
panic: Make panic_timeout configurable
The panic_timeout value can be set via the command line option 'panic=x', or via /proc/sys/kernel/panic, however that is not sufficient when the panic occurs before we are able to set up these values. Thus, add a CONFIG_PANIC_TIMEOUT so that we can set the desired value from the .config. The default panic_timeout value continues to be 0 - wait forever. Also adds set_arch_panic_timeout(new_timeout, arch_default_timeout), which is intended to be used by arches in arch_setup(). The idea being that the new_timeout is only set if the user hasn't changed from the arch_default_timeout. Signed-off-by: Jason Baron <jbaron@akamai.com> Cc: benh@kernel.crashing.org Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: mpe@ellerman.id.au Cc: felipe.contreras@gmail.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1a1674daec27c534df409697025ac568ebcee91e.1385418410.git.jbaron@akamai.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--include/linux/kernel.h9
-rw-r--r--kernel/panic.c2
-rw-r--r--lib/Kconfig.debug9
3 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d4e98d13eff..2ac02772a86 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -393,6 +393,15 @@ extern int panic_on_oops;
extern int panic_on_unrecovered_nmi;
extern int panic_on_io_nmi;
extern int sysctl_panic_on_stackoverflow;
+/*
+ * Only to be used by arch init code. If the user over-wrote the default
+ * CONFIG_PANIC_TIMEOUT, honor it.
+ */
+static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
+{
+ if (panic_timeout == arch_default_timeout)
+ panic_timeout = timeout;
+}
extern const char *print_tainted(void);
enum lockdep_ok {
LOCKDEP_STILL_OK,
diff --git a/kernel/panic.c b/kernel/panic.c
index c00b4ceb39e..6d630037509 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -33,7 +33,7 @@ static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
-int panic_timeout;
+int panic_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index db25707aa41..6982094a7e7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -761,6 +761,15 @@ config PANIC_ON_OOPS_VALUE
default 0 if !PANIC_ON_OOPS
default 1 if PANIC_ON_OOPS
+config PANIC_TIMEOUT
+ int "panic timeout"
+ default 0
+ help
+ Set the timeout value (in seconds) until a reboot occurs when the
+ the kernel panics. If n = 0, then we wait forever. A timeout
+ value n > 0 will wait n seconds before rebooting, while a timeout
+ value n < 0 will reboot immediately.
+
config SCHED_DEBUG
bool "Collect scheduler debugging info"
depends on DEBUG_KERNEL && PROC_FS