proc: don't use READ_ONCE/WRITE_ONCE for /proc/*/fail-nth
READ_ONCE and WRITE_ONCE are useless when there is only one read/write
is being made.
Link: http://lkml.kernel.org/r/20171120204033.GA9446@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
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 fe56f3c..3730912 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1370,7 +1370,7 @@ static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf,
task = get_proc_task(file_inode(file));
if (!task)
return -ESRCH;
- WRITE_ONCE(task->fail_nth, n);
+ task->fail_nth = n;
put_task_struct(task);
return count;
@@ -1386,8 +1386,7 @@ static ssize_t proc_fail_nth_read(struct file *file, char __user *buf,
task = get_proc_task(file_inode(file));
if (!task)
return -ESRCH;
- len = snprintf(numbuf, sizeof(numbuf), "%u\n",
- READ_ONCE(task->fail_nth));
+ len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth);
len = simple_read_from_buffer(buf, count, ppos, numbuf, len);
put_task_struct(task);
