Messages in this thread Patch in this message |  | | Date | Fri, 24 Oct 2014 00:48:33 +0000 (GMT) | From | Eunbong Song <> | Subject | [PATCH resend] mips: add arch_trigger_all_cpu_backtrace() function |
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Currently, arch_trigger_all_cpu_backtrace() is defined in only x86 and sparc which has nmi interrupt. But in case of softlockup not a hadrlockup, it could be possible to dump backtrace of all cpus. And this could be helpful for debugging.
for example, if system has 2 cpus.
CPU 0 CPU 1 acquire read_lock()
try to do write_lock()
,,, missing read_unlock()
In this case, dump_stack() print only backtrace for "CPU 0". If CPU1's calltrace is printed it's very helpful.
This patch adds arch_trigger_all_cpu_backtrace() for mips architecture. And this enables when softlockup_all_cpu_backtrace is equalt to 1 and softlock is occurred to dump all cpu's backtrace.
Signed-off-by: Eunbong Song <eunb.song@samsung.com> --- arch/mips/include/asm/irq.h | 3 +++ arch/mips/kernel/process.c | 18 ++++++++++++++++++ 2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h index 39f07ae..5a4e1bb 100644 --- a/arch/mips/include/asm/irq.h +++ b/arch/mips/include/asm/irq.h @@ -48,4 +48,7 @@ extern int cp0_compare_irq; extern int cp0_compare_irq_shift; extern int cp0_perfcount_irq; +void arch_trigger_all_cpu_backtrace(bool); +#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace + #endif /* _ASM_IRQ_H */ diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 636b074..5801f21 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -42,6 +42,7 @@ #include <asm/isadep.h> #include <asm/inst.h> #include <asm/stacktrace.h> +#include <asm/irq_regs.h> #ifdef CONFIG_HOTPLUG_CPU void arch_cpu_idle_dead(void) @@ -532,3 +533,20 @@ unsigned long arch_align_stack(unsigned long sp) return sp & ALMASK; } + +static void arch_dump_stack(void *info) +{ + struct pt_regs *regs; + + regs = get_irq_regs(); + + if (regs) + show_regs(regs); + + dump_stack(); +} + +void arch_trigger_all_cpu_backtrace(bool include_self) +{ + smp_call_function(arch_dump_stack, NULL, 1); +} -- 1.7.0.1
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