linux-kernel - [PATCH 2/4] sysfs: Reduce s_flags to an unsinged short so it packs well with s

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Message-ID: <m1zkepjjb8.fsf_-_@fess.ebiederm.org>
Date:	Sun, 18 Dec 2011 20:07:23 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	<linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: [PATCH 2/4] sysfs: Reduce s_flags to an unsinged short so it packs well with s_mode


On 32bit this reduces sizeof(struct sysfs_dirent) by 2 bytes.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 fs/sysfs/sysfs.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 545a8d4..e10ff98 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -77,7 +77,7 @@ struct sysfs_dirent {
 		struct sysfs_elem_bin_attr	s_bin_attr;
 	};
 
-	unsigned int		s_flags;
+	unsigned short		s_flags;
 	unsigned short		s_mode;
 	ino_t			s_ino;
 	struct sysfs_inode_attrs *s_iattr;
@@ -94,11 +94,11 @@ struct sysfs_dirent {
 #define SYSFS_ACTIVE_REF		(SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
 
 /* identify any namespace tag on sysfs_dirents */
-#define SYSFS_NS_TYPE_MASK		0xff00
+#define SYSFS_NS_TYPE_MASK		0xf00
 #define SYSFS_NS_TYPE_SHIFT		8
 
 #define SYSFS_FLAG_MASK			~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)
-#define SYSFS_FLAG_REMOVED		0x020000
+#define SYSFS_FLAG_REMOVED		0x02000
 
 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
 {
-- 
1.7.2.5

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