[PATCH] panic_on_oops: remove ssleep()

This patch is part of an effort to unify the panic_on_oops behaviour across
all architectures that implement it.

It was pointed out to me by Andi Kleen that if an oops has occured in
interrupt context, then calling sleep() in the oops path will only cause a
panic, and that it would be really better for it not to be in the path at
all.

This patch removes the ssleep() call and reworks the console message
accordinly.  I have a slght concern that the resulting console message is
too long, feedback welcome.

For powerpc it also unifies the 32bit and 64bit behaviour.

Fror x86_64, this patch only updates the console message, as ssleep() is
already not present.

Signed-off-by: Horms <horms@verge.net.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6 files changed, 14 insertions, 28 deletions

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 35a052fc177..4e29dd03e58 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -232,11 +232,8 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
 	bust_spinlocks(0);
 	spin_unlock_irq(&die_lock);
 
-	if (panic_on_oops) {
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-		panic("Fatal exception");
-	}
+	if (panic_on_oops)
+		panic("Fatal exception: panic_on_oops");
 
 	do_exit(SIGSEGV);
 }
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 021f8fdc751..0d4005dc06c 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -453,11 +453,9 @@ void die(const char * str, struct pt_regs * regs, long err)
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
 
-	if (panic_on_oops) {
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-		panic("Fatal exception");
-	}
+	if (panic_on_oops)
+		panic("Fatal exception: panic_on_oops");
+
 	oops_exit();
 	do_exit(SIGSEGV);
 }
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index e7bbb0f40aa..5a0420464c6 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -117,11 +117,8 @@ die (const char *str, struct pt_regs *regs, long err)
 	die.lock_owner = -1;
 	spin_unlock_irq(&die.lock);
 
-	if (panic_on_oops) {
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-		panic("Fatal exception");
-	}
+	if (panic_on_oops)
+		panic("Fatal exception: panic_on_oops");
 
   	do_exit(SIGSEGV);
 }
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 3c668078e52..2105767fcc5 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -150,13 +150,9 @@ int die(const char *str, struct pt_regs *regs, long err)
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
 
-	if (panic_on_oops) {
-#ifdef CONFIG_PPC64
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-#endif
-		panic("Fatal exception");
-	}
+	if (panic_on_oops)
+		panic("Fatal exception: panic_on_oops");
+
 	do_exit(err);
 
 	return 0;
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index f7a9d142107..4e9938dee06 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -529,7 +529,7 @@ void __kprobes oops_end(unsigned long flags)
 		/* Nest count reaches zero, release the lock. */
 		spin_unlock_irqrestore(&die_lock, flags);
 	if (panic_on_oops)
-		panic("Oops");
+		panic("Fatal exception: panic_on_oops");
 }
 
 void __kprobes __die(const char * str, struct pt_regs * regs, long err)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 27e409089a7..9734960a245 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -487,11 +487,9 @@ void die(const char * str, struct pt_regs * regs, long err)
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");
 
-	if (panic_on_oops) {
-		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		ssleep(5);
-		panic("Fatal exception");
-	}
+	if (panic_on_oops)
+		panic("Fatal exception: panic_on_oops");
+
 	do_exit(err);
 }