[PATCH -next] misc: watch_queue: Fix build error

[YueHaibing]

drivers/misc/watch_queue.c: In function watch_queue_account_mem:
drivers/misc/watch_queue.c:309:38: error: struct user_struct has no member 
named locked_vm; did you mean locked_shm?
  cur_pages = atomic_long_read(&user->locked_vm);
                                      ^~~~~~~~~
                                      locked_shm

struct user_struct {
...
   #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
       defined(CONFIG_NET) || defined(CONFIG_IO_URING)
           atomic_long_t locked_vm;
   #endif
...
}

If none of the CONFIGS is defined, locked_vm will be unavailable.

Reported-by: Hulk Robot <hul...@huawei.com>
Fixes: 064756fb355a ("General notification queue with user mmap()'able ring 
buffer")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 include/linux/sched/user.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched/user.h b/include/linux/sched/user.h
index 917d88e..126494d 100644
--- a/include/linux/sched/user.h
+++ b/include/linux/sched/user.h
@@ -33,7 +33,8 @@ struct user_struct {
        kuid_t uid;
 
 #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) || \
-    defined(CONFIG_NET) || defined(CONFIG_IO_URING)
+       defined(CONFIG_NET) || defined(CONFIG_IO_URING) || \
+       defined(CONFIG_WATCH_QUEUE)
        atomic_long_t locked_vm;
 #endif
 
-- 
2.7.4