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 <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3954f50805b8ae2b6e0254615d24344cf6d27dc8..97af285c63e152b13334e9fb40ad4966e6ec08c7 100644 (file)
--- 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)) {