Revision c42978f7ecaa5c29bdd5fea507e09e6eff9d9f27 authored by Linus Torvalds on 24 November 2010, 21:57:11 UTC, committed by Linus Torvalds on 24 November 2010, 21:57:11 UTC
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: virtio: fix format of sysfs driver/vendor files Char: virtio_console, fix memory leak virtio: return correct capacity to users module: Update prototype for ref_module (formerly use_module)
smp_processor_id.c
/*
* lib/smp_processor_id.c
*
* DEBUG_PREEMPT variant of smp_processor_id().
*/
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/sched.h>
notrace unsigned int debug_smp_processor_id(void)
{
unsigned long preempt_count = preempt_count();
int this_cpu = raw_smp_processor_id();
if (likely(preempt_count))
goto out;
if (irqs_disabled())
goto out;
/*
* Kernel threads bound to a single CPU can safely use
* smp_processor_id():
*/
if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu)))
goto out;
/*
* It is valid to assume CPU-locality during early bootup:
*/
if (system_state != SYSTEM_RUNNING)
goto out;
/*
* Avoid recursion:
*/
preempt_disable_notrace();
if (!printk_ratelimit())
goto out_enable;
printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] "
"code: %s/%d\n",
preempt_count() - 1, current->comm, current->pid);
print_symbol("caller is %s\n", (long)__builtin_return_address(0));
dump_stack();
out_enable:
preempt_enable_no_resched_notrace();
out:
return this_cpu;
}
EXPORT_SYMBOL(debug_smp_processor_id);
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