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debug lockups: Improve lockup detection, fix generic arch fallback

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As Andrew noted, my previous patch ("debug lockups: Improve lockup
detection") broke/removed SysRq-L support from architecture that do
not provide a __trigger_all_cpu_backtrace implementation.

Restore a fallback path and clean up the SysRq-L machinery a bit:

 - Rename the arch method to arch_trigger_all_cpu_backtrace()

 - Simplify the define

 - Document the method a bit - in the hope of more architectures
   adding support for it.

[ The patch touches Sparc code for the rename. ]

Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S. Miller" <davem@davemloft.net>
LKML-Reference: <20090802140809.7ec4bb6b.akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-08-03 09:31:54 +02:00
parent c1dc0b9c0c
commit 47cab6a722
6 changed files with 38 additions and 10 deletions
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2
arch/x86/kernel/apic/nmi.c
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@ -554,7 +554,7 @@ int do_nmi_callback(struct pt_regs *regs, int cpu)
return 0;
}
void __trigger_all_cpu_backtrace(void)
void arch_trigger_all_cpu_backtrace(void)
{
int i;