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sched: switch sched_features to seqfile

Browse source 
Impact: cleanup

So handling of sched_features read is simplified.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2008-10-30 15:23:32 +08:00 committed by Ingo Molnar
parent eab172294d
commit 34f3a814ee
1 changed files with 16 additions and 36 deletions
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52
kernel/sched.c
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@ -703,45 +703,18 @@ static __read_mostly char *sched_feat_names[] = {
#undef SCHED_FEAT #undef SCHED_FEAT
static int sched_feat_open(struct inode *inode, struct file *filp) static int sched_feat_show(struct seq_file *m, void *v)
{ {
filp->private_data = inode->i_private;
return 0;
}
static ssize_t
sched_feat_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char *buf;
int r = 0;
int len = 0;
int i; int i;
for (i = 0; sched_feat_names[i]; i++) { for (i = 0; sched_feat_names[i]; i++) {
len += strlen(sched_feat_names[i]); if (!(sysctl_sched_features & (1UL << i)))
len += 4; seq_puts(m, "NO_");
seq_printf(m, "%s ", sched_feat_names[i]);
} }
seq_puts(m, "\n");
buf = kmalloc(len + 2, GFP_KERNEL); return 0;
if (!buf)
return -ENOMEM;
for (i = 0; sched_feat_names[i]; i++) {
if (sysctl_sched_features & (1UL << i))
r += sprintf(buf + r, "%s ", sched_feat_names[i]);
else
r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
}
r += sprintf(buf + r, "\n");
WARN_ON(r >= len + 2);
r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
kfree(buf);
return r;
} }
static ssize_t static ssize_t
@ -786,10 +759,17 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
return cnt; return cnt;
} }
static int sched_feat_open(struct inode *inode, struct file *filp)
{
return single_open(filp, sched_feat_show, NULL);
}
static struct file_operations sched_feat_fops = { static struct file_operations sched_feat_fops = {
.open = sched_feat_open, .open = sched_feat_open,
.read = sched_feat_read, .write = sched_feat_write,
.write = sched_feat_write, .read = seq_read,
.llseek = seq_lseek,
.release = single_release,
}; };
static __init int sched_init_debug(void) static __init int sched_init_debug(void)