korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 04:18:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

cpumask: Optimize cpumask_of_cpu in lib/smp_processor_id.c

Browse Source 
* 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>
This commit is contained in:
Mike Travis 2008-07-15 14:14:35 -07:00 committed by Ingo Molnar
parent c18a41fbbc
commit 4755b92912
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/smp_processor_id.c
View File

@ -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;
/*