cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c

  * Optimize various places where a pointer to the cpumask_of_cpu value
    will result in reducing stack pressure.

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 3b4dc09..9fb2df0 100644 (file)
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -11,7 +11,7 @@ notrace unsigned int debug_smp_processor_id(void)
 {
        unsigned long preempt_count = preempt_count();
        int this_cpu = raw_smp_processor_id();
-       cpumask_t this_mask;
+       cpumask_of_cpu_ptr_declare(this_mask);
 
        if (likely(preempt_count))
                goto out;
@@ -23,9 +23,9 @@ notrace unsigned int debug_smp_processor_id(void)
         * Kernel threads bound to a single CPU can safely use
         * smp_processor_id():
         */
-       this_mask = cpumask_of_cpu(this_cpu);
+       cpumask_of_cpu_ptr_next(this_mask, cpu);
 
-       if (cpus_equal(current->cpus_allowed, this_mask))
+       if (cpus_equal(current->cpus_allowed, *this_mask))
                goto out;
 
        /*