b58d977432
Add functionality to serialize the output from dump_stack() to avoid mangling of the output when dump_stack is called simultaneously from multiple cpus. [akpm@linux-foundation.org: fix comment indenting, avoid inclusion of <asm/> files - use <linux/> where possiblem fix uniprocessor build (__dump_stack undefined), remove unneeded ifdef around smp.h inclusion] Signed-off-by: Alex Thorlton <athorlton@sgi.com> Reported-by: Russ Anderson <rja@sgi.com> Reviewed-by: Robin Holt <holt@sgi.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: David S. Miller <davem@davemloft.net> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
/*
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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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void dump_stack(void)
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{
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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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preempt_disable();
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retry:
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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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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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preempt_enable();
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}
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#else
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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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