[PATCH] vfs: use RCU_INIT_POINTER when NULLing

From: Muhammad Falak R Wani
Date: Sat Apr 30 2016 - 16:09:32 EST


It is always safe to use RCU_INIT_POINTER to NULL a pointer. This
results in slightly smaller/faster code.

The following semantic patch used:
<smpl>
@@
@@
- rcu_assign_pointer
+ RCU_INIT_POINTER
(..., NULL)

</smpl>

Signed-off-by: Muhammad Falak R Wani <falakreyaz@xxxxxxxxx>
---
fs/file.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 1fbc5c0..e027b33 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -543,7 +543,7 @@ repeat:
/* Sanity check */
if (rcu_access_pointer(fdt->fd[fd]) != NULL) {
printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd);
- rcu_assign_pointer(fdt->fd[fd], NULL);
+ RCU_INIT_POINTER(fdt->fd[fd], NULL);
}
#endif

@@ -644,7 +644,7 @@ int __close_fd(struct files_struct *files, unsigned fd)
file = fdt->fd[fd];
if (!file)
goto out_unlock;
- rcu_assign_pointer(fdt->fd[fd], NULL);
+ RCU_INIT_POINTER(fdt->fd[fd], NULL);
__clear_close_on_exec(fd, fdt);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
@@ -679,7 +679,7 @@ void do_close_on_exec(struct files_struct *files)
file = fdt->fd[fd];
if (!file)
continue;
- rcu_assign_pointer(fdt->fd[fd], NULL);
+ RCU_INIT_POINTER(fdt->fd[fd], NULL);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
filp_close(file, files);
--
1.9.1