linux-kernel - [RFC PATCH 3/9] debugfs: debugfs_real_fops(): drop __must

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Message-Id: <20170416095137.2784-4-nicstange@gmail.com>
Date:   Sun, 16 Apr 2017 11:51:31 +0200
From:   Nicolai Stange <nicstange@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Johannes Berg <johannes@...solutions.net>,
        "Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>,
        Nicolai Stange <nicstange@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/9] debugfs: debugfs_real_fops(): drop __must_hold sparse annotation

Currently, debugfs_real_fops() is annotated with a
__must_hold(&debugfs_srcu) sparse annotation.

With the conversion of the SRCU based protection of users against
concurrent file removals to a per-file refcount based scheme, this becomes
wrong.

Drop this annotation.

Signed-off-by: Nicolai Stange <nicstange@...il.com>
---
 fs/debugfs/file.c       | 6 +-----
 include/linux/debugfs.h | 3 +--
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 081d74d390a6..3bc3e2e69f80 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -98,13 +98,9 @@ EXPORT_SYMBOL_GPL(debugfs_use_file_finish);
 #define F_DENTRY(filp) ((filp)->f_path.dentry)
 
 const struct file_operations *debugfs_real_fops(const struct file *filp)
-	__must_hold(&debugfs_srcu)
 {
 	struct debugfs_fsdata *fsd = F_DENTRY(filp)->d_fsdata;
-	/*
-	 * Neither the pointer to the struct file_operations, nor its
-	 * contents ever change -- srcu_dereference() is not needed here.
-	 */
+
 	return fsd->real_fops;
 }
 EXPORT_SYMBOL_GPL(debugfs_real_fops);
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index d1f1104c41ee..c65ff61b498c 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -95,8 +95,7 @@ int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
 
 void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu);
 
-const struct file_operations *debugfs_real_fops(const struct file *filp)
-	__must_hold(&debugfs_srcu);
+const struct file_operations *debugfs_real_fops(const struct file *filp);
 
 int debugfs_file_get(struct dentry *dentry);
 void debugfs_file_put(struct dentry *dentry);
-- 
2.12.2