0c98d344fe
So the original intention of tsk_cpus_allowed() was to 'future-proof' the field - but it's pretty ineffectual at that, because half of the code uses ->cpus_allowed directly ... Also, the wrapper makes the code longer than the original expression! So just get rid of it. This also shrinks <linux/sched.h> a bit. 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>
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
|
|
* lib/smp_processor_id.c
|
|
*
|
|
* DEBUG_PREEMPT variant of smp_processor_id().
|
|
*/
|
|
#include <linux/export.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/sched.h>
|
|
|
|
notrace static unsigned int check_preemption_disabled(const char *what1,
|
|
const char *what2)
|
|
{
|
|
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 %s%s() in preemptible [%08x] code: %s/%d\n",
|
|
what1, what2, 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;
|
|
}
|
|
|
|
notrace unsigned int debug_smp_processor_id(void)
|
|
{
|
|
return check_preemption_disabled("smp_processor_id", "");
|
|
}
|
|
EXPORT_SYMBOL(debug_smp_processor_id);
|
|
|
|
notrace void __this_cpu_preempt_check(const char *op)
|
|
{
|
|
check_preemption_disabled("__this_cpu_", op);
|
|
}
|
|
EXPORT_SYMBOL(__this_cpu_preempt_check);
|