linux-kernel - [PATCH] proc: smaller RCU section in ->getattr()

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Message-ID: <20180423213626.GB9043@avx2>
Date:   Tue, 24 Apr 2018 00:36:26 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] proc: smaller RCU section in ->getattr()

struct kstat is thread local.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 fs/proc/base.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1787,9 +1787,9 @@ 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)) {