linux-kernel - [PATCH 2/3] fput: move ->f_next_put into a union with ->f

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Message-ID: <20150908171449.GA14596@redhat.com>
Date:	Tue, 8 Sep 2015 19:14:49 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Al Viro <viro@...iv.linux.org.uk>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Maciej Żenczykowski <maze@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] fput: move ->f_next_put into a union with ->f_version

file->f_next_put can share the memory with file->f_version (I hope).

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 include/linux/fs.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3941b86..58faad6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -860,8 +860,10 @@ struct file {
 	const struct cred	*f_cred;
 	struct file_ra_state	f_ra;
 
-	u64			f_version;
-	struct file		*f_next_put;
+	union {
+		u64		f_version;
+		struct file	*f_next_put;
+	};
 #ifdef CONFIG_SECURITY
 	void			*f_security;
 #endif
-- 
2.4.3

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