forked from mirrors/linux
b17b01533b
We are going to split <linux/sched/debug.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/debug.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
65 lines
1.2 KiB
C
65 lines
1.2 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/sched/debug.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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