panic: Make panic_on_oops configurable

Several distros set this by default by patching panic_on_oops.
It seems to fit with the BOOTPARAM_{HARD,SOFT}_PANIC options
though, so let's add a Kconfig entry and reduce some more
upstream delta.

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120411121529.GH26688@redacted.bos.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/panic.c b/kernel/panic.c
index 8ed89a1..b6215b7 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -27,7 +27,7 @@
 #define PANIC_TIMER_STEP 100
 #define PANIC_BLINK_SPD 18
 
-int panic_on_oops;
+int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
 static unsigned long tainted_mask;
 static int pause_on_oops;
 static int pause_on_oops_flag;

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6777153..91858cd 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -228,6 +228,26 @@ config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
        default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
        default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
 
+config PANIC_ON_OOPS
+       bool "Panic on Oops" if EXPERT
+       default n
+       help
+         Say Y here to enable the kernel to panic when it oopses. This
+         has the same effect as setting oops=panic on the kernel command
+         line.
+
+         This feature is useful to ensure that the kernel does not do
+         anything erroneous after an oops which could result in data
+         corruption or other issues.
+
+         Say N if unsure.
+
+config PANIC_ON_OOPS_VALUE
+       int
+       range 0 1
+       default 0 if !PANIC_ON_OOPS
+       default 1 if PANIC_ON_OOPS
+
 config DETECT_HUNG_TASK
        bool "Detect Hung Tasks"
        depends on DEBUG_KERNEL