linux-kernel - [PATCH] fs: Use RCU_INIT_POINTER(x, NULL) in file.c

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Date:	Mon, 24 Mar 2014 00:13:31 +0530
From:	Monam Agarwal <monamagarwal123@...il.com>
To:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fs: Use RCU_INIT_POINTER(x, NULL) in file.c

This patch replaces rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a structure       
is carried out before storing a pointer to that structure. 
And in the case of the NULL pointer, there is no structure to initialize. 
So, rcu_assign_pointer(p, NULL) can be safely converted to RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@...il.com>
---
 fs/file.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 60a45e9..f87f265 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -499,7 +499,7 @@ repeat:
 	/* Sanity check */
 	if (rcu_dereference_raw(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
 
@@ -590,7 +590,7 @@ 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);
@@ -625,7 +625,7 @@ 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);
-- 
1.7.9.5

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