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sched: Clean up parameter passing of proc_sched_autogroup_set_nice()

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Pass nice as a value to proc_sched_autogroup_set_nice().

No side effect is expected, and the variable err will be overwritten with
the return value.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4F45FBB7.5090607@ct.jp.nec.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hiroshi Shimamoto 2012-02-23 17:41:27 +09:00 committed by Ingo Molnar
parent 367456c756
commit 2e5b5b3a1b
3 changed files with 8 additions and 9 deletions
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3
fs/proc/base.c
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@ -1310,8 +1310,7 @@ sched_autogroup_write(struct file *file, const char __user *buf,
if (!p)
return -ESRCH;
err = nice;
err = proc_sched_autogroup_set_nice(p, &err);
err = proc_sched_autogroup_set_nice(p, nice);
if (err)
count = err;

2
include/linux/sched.h
View File

@ -2065,7 +2065,7 @@ extern void sched_autogroup_fork(struct signal_struct *sig);
extern void sched_autogroup_exit(struct signal_struct *sig);
#ifdef CONFIG_PROC_FS
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
#endif
#else
static inline void sched_autogroup_create_attach(struct task_struct *p) { }

12
kernel/sched/auto_group.c
View File

@ -195,20 +195,20 @@ __setup("noautogroup", setup_autogroup);
#ifdef CONFIG_PROC_FS
int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice)
int proc_sched_autogroup_set_nice(struct task_struct *p, int nice)
{
static unsigned long next = INITIAL_JIFFIES;
struct autogroup *ag;
int err;
if (*nice < -20 || *nice > 19)
if (nice < -20 || nice > 19)
return -EINVAL;
err = security_task_setnice(current, *nice);
err = security_task_setnice(current, nice);
if (err)
return err;
if (*nice < 0 && !can_nice(current, *nice))
if (nice < 0 && !can_nice(current, nice))
return -EPERM;
/* this is a heavy operation taking global locks.. */
@ -219,9 +219,9 @@ int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice)
ag = autogroup_task_get(p);
down_write(&ag->lock);
err = sched_group_set_shares(ag->tg, prio_to_weight[*nice + 20]);
err = sched_group_set_shares(ag->tg, prio_to_weight[nice + 20]);
if (!err)
ag->nice = *nice;
ag->nice = nice;
up_write(&ag->lock);
autogroup_kref_put(ag);