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sched: switch sched_features to seqfile
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>
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1 changed files with 16 additions and 36 deletions
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@ -703,45 +703,18 @@ static __read_mostly char *sched_feat_names[] = {
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#undef SCHED_FEAT
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static int sched_feat_open(struct inode *inode, struct file *filp)
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static int sched_feat_show(struct seq_file *m, void *v)
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{
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filp->private_data = inode->i_private;
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return 0;
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}
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static ssize_t
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sched_feat_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char *buf;
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int r = 0;
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int len = 0;
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int i;
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for (i = 0; sched_feat_names[i]; i++) {
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len += strlen(sched_feat_names[i]);
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len += 4;
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if (!(sysctl_sched_features & (1UL << i)))
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seq_puts(m, "NO_");
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seq_printf(m, "%s ", sched_feat_names[i]);
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}
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seq_puts(m, "\n");
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buf = kmalloc(len + 2, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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for (i = 0; sched_feat_names[i]; i++) {
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if (sysctl_sched_features & (1UL << i))
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r += sprintf(buf + r, "%s ", sched_feat_names[i]);
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else
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r += sprintf(buf + r, "NO_%s ", sched_feat_names[i]);
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}
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r += sprintf(buf + r, "\n");
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WARN_ON(r >= len + 2);
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r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
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kfree(buf);
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return r;
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return 0;
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}
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static ssize_t
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@ -786,10 +759,17 @@ sched_feat_write(struct file *filp, const char __user *ubuf,
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return cnt;
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}
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static int sched_feat_open(struct inode *inode, struct file *filp)
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{
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return single_open(filp, sched_feat_show, NULL);
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}
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static struct file_operations sched_feat_fops = {
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.open = sched_feat_open,
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.read = sched_feat_read,
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.write = sched_feat_write,
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.open = sched_feat_open,
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.write = sched_feat_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static __init int sched_init_debug(void)
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