/*
 * 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);
oop-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/'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/display/tda998x.h'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/display/tda998x.h?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/display/tda998x.h?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/display/tda998x.h?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/display/tda998x.h'>
<input type='hidden' name='id' value='f94484b7584765eebded5d7bfdeb0b2c7b1caf51'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/display?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>display</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/display/tda998x.h?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51'>tda998x.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/display/tda998x.h?id=f94484b7584765eebded5d7bfdeb0b2c7b1caf51&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>