From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Fri, 8 Jun 2018 00:10:07 +0000 (-0700)
Subject: proc: smaller RCU section in ->getattr()
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=941169298a3e60db694373acbb49cd6569c8398b;p=openwrt%2Fstaging%2Fblogic.git

proc: smaller RCU section in ->getattr()

struct kstat is thread local.

Link: http://lkml.kernel.org/r/20180423213626.GB9043@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>
---

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3954f50805b8..97af285c63e1 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1755,9 +1755,9 @@ int pid_getattr(const struct path *path, struct kstat *stat,
 
 	generic_fillattr(inode, stat);
 
-	rcu_read_lock();
 	stat->uid = GLOBAL_ROOT_UID;
 	stat->gid = GLOBAL_ROOT_GID;
+	rcu_read_lock();
 	task = pid_task(proc_pid(inode), PIDTYPE_PID);
 	if (task) {
 		if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) {