/*
 * Provide a default dump_stack() function for architectures
 * which don't implement their own.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/atomic.h>

static void __dump_stack(void)
{
	dump_stack_print_info(KERN_DEFAULT);
	show_stack(NULL, NULL);
}

/**
 * dump_stack - dump the current task information and its stack trace
 *
 * Architectures can override this implementation by implementing its own.
 */
#ifdef CONFIG_SMP
static atomic_t dump_lock = ATOMIC_INIT(-1);

asmlinkage __visible void dump_stack(void)
{
	unsigned long flags;
	int was_locked;
	int old;
	int cpu;

	/*
	 * Permit this cpu to perform nested stack dumps while serialising
	 * against other CPUs
	 */
retry:
	local_irq_save(flags);
	cpu = smp_processor_id();
	old = atomic_cmpxchg(&dump_lock, -1, cpu);
	if (old == -1) {
		was_locked = 0;
	} else if (old == cpu) {
		was_locked = 1;
	} else {
		local_irq_restore(flags);
		cpu_relax();
		goto retry;
	}

	__dump_stack();

	if (!was_locked)
		atomic_set(&dump_lock, -1);

	local_irq_restore(flags);
}
#else
asmlinkage __visible void dump_stack(void)
{
	__dump_stack();
}
#endif
EXPORT_SYMBOL(dump_stack);
alue='packet-loop-back'>packet-loop-back</option>
<option value='packet-rx-pump-back'>packet-rx-pump-back</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/net/bluetooth/cmtp/Makefile?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/net/bluetooth/cmtp/Makefile?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/cmtp/Makefile?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>commit</a><a class='active' href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/cmtp/Makefile?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/bluetooth/cmtp/Makefile'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>root</a>/<a href='/cgit.cgi/linux/net-next.git/diff/net?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>net</a>/<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>bluetooth</a>/<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/cmtp?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>cmtp</a>/<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/cmtp/Makefile?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>Makefile</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='206c4720092d2a24bfefc041b377e889a220ffbf'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=206c4720092d2a24bfefc041b377e889a220ffbf'>Diffstat</a> (limited to 'net/bluetooth/cmtp/Makefile')</div><table summary='diffstat' class='diffstat'>