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proc: skip branch in /proc/*/* lookup 

Code is structured like this:

	for ( ... p < last; p++) {
		if (memcmp == 0)
			break;
	}
	if (p >= last)
		ERROR
	OK

gcc doesn't see that if if lookup succeeds than post loop branch will
never be taken and skip it.

[akpm@linux-foundation.org: proc_pident_instantiate() no longer takes an inode*]
Link: http://lkml.kernel.org/r/20180423213954.GD9043@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-06-14 15:27:17 -07:00 committed by Linus Torvalds
parent 37a4094e82
commit 26b95137d6
1 changed files with 3 additions and 6 deletions
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9
fs/proc/base.c
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@ -2439,14 +2439,11 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
for (p = ents; p < last; p++) {
if (p->len != dentry->d_name.len)
continue;
if (!memcmp(dentry->d_name.name, p->name, p->len))
if (!memcmp(dentry->d_name.name, p->name, p->len)) {
res = proc_pident_instantiate(dentry, task, p);
break;
}
}
if (p >= last)
goto out;
res = proc_pident_instantiate(dentry, task, p);
out:
put_task_struct(task);
out_no_task:
return res;