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64 lines
1.2 KiB
64 lines
1.2 KiB
/* |
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* Provide a default dump_stack() function for architectures |
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* which don't implement their own. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/smp.h> |
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#include <linux/atomic.h> |
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static void __dump_stack(void) |
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{ |
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dump_stack_print_info(KERN_DEFAULT); |
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show_stack(NULL, NULL); |
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} |
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/** |
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* dump_stack - dump the current task information and its stack trace |
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* |
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* Architectures can override this implementation by implementing its own. |
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*/ |
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#ifdef CONFIG_SMP |
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static atomic_t dump_lock = ATOMIC_INIT(-1); |
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asmlinkage __visible void dump_stack(void) |
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{ |
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unsigned long flags; |
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int was_locked; |
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int old; |
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int cpu; |
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/* |
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* Permit this cpu to perform nested stack dumps while serialising |
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* against other CPUs |
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*/ |
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retry: |
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local_irq_save(flags); |
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cpu = smp_processor_id(); |
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old = atomic_cmpxchg(&dump_lock, -1, cpu); |
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if (old == -1) { |
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was_locked = 0; |
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} else if (old == cpu) { |
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was_locked = 1; |
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} else { |
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local_irq_restore(flags); |
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cpu_relax(); |
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goto retry; |
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} |
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__dump_stack(); |
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if (!was_locked) |
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atomic_set(&dump_lock, -1); |
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local_irq_restore(flags); |
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} |
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#else |
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asmlinkage __visible void dump_stack(void) |
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{ |
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__dump_stack(); |
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} |
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#endif |
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EXPORT_SYMBOL(dump_stack);
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