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[PATCH] cpuset: remove unnecessary NULL check 

Remove a no longer needed test for NULL cpuset pointer, with a little
comment explaining why the test isn't needed.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Jackson 2006-03-24 03:16:10 -08:00 committed by Linus Torvalds
parent b0196009d8
commit 8488bc359d
1 changed files with 6 additions and 12 deletions
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18
kernel/cpuset.c
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@ -2023,7 +2023,7 @@ void cpuset_fork(struct task_struct *child)
* because tsk is already marked PF_EXITING, so attach_task() won't
* mess with it, or task is a failed fork, never visible to attach_task.
*
* Hack:
* the_top_cpuset_hack:
*
* Set the exiting tasks cpuset to the root cpuset (top_cpuset).
*
@ -2062,7 +2062,7 @@ void cpuset_exit(struct task_struct *tsk)
struct cpuset *cs;
cs = tsk->cpuset;
tsk->cpuset = &top_cpuset; /* Hack - see comment above */
tsk->cpuset = &top_cpuset; /* the_top_cpuset_hack - see above */
if (notify_on_release(cs)) {
char *pathbuf = NULL;
@ -2373,12 +2373,12 @@ void __cpuset_memory_pressure_bump(void)
* - No need to task_lock(tsk) on this tsk->cpuset reference, as it
* doesn't really matter if tsk->cpuset changes after we read it,
* and we take manage_mutex, keeping attach_task() from changing it
* anyway.
* anyway. No need to check that tsk->cpuset != NULL, thanks to
* the_top_cpuset_hack in cpuset_exit(), which sets an exiting tasks
* cpuset to top_cpuset.
*/
static int proc_cpuset_show(struct seq_file *m, void *v)
{
struct cpuset *cs;
struct task_struct *tsk;
char *buf;
int retval = 0;
@ -2389,13 +2389,7 @@ static int proc_cpuset_show(struct seq_file *m, void *v)
tsk = m->private;
mutex_lock(&manage_mutex);
cs = tsk->cpuset;
if (!cs) {
retval = -EINVAL;
goto out;
}
retval = cpuset_path(cs, buf, PAGE_SIZE);
retval = cpuset_path(tsk->cpuset, buf, PAGE_SIZE);
if (retval < 0)
goto out;
seq_puts(m, buf);