diff options
| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2018-06-14 15:27:17 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-15 07:55:24 +0900 |
| commit | 26b95137d673d8d6a9a124d433d968e18298f4ed (patch) | |
| tree | 1f31d199ff9290dbd082a2559731fb6fce193edc /fs | |
| parent | mremap: remove LATENCY_LIMIT from mremap to reduce the number of TLB shootdowns (diff) | |
| download | linux-dev-26b95137d673d8d6a9a124d433d968e18298f4ed.tar.xz linux-dev-26b95137d673d8d6a9a124d433d968e18298f4ed.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/base.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 80aa42506b8b..b6572944efc3 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -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; |