linux-kernel - [PATCH] Define the shmem_inode

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Date:	Wed, 07 Feb 2007 12:40:30 -0800
From:	Adam Litke <agl@...ibm.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, agl@...ibm.com
Subject: [PATCH] Define the shmem_inode_info flags directly


Andrew: This is a pretty basic and obvious cleanup IMO.  How about a ride in
-mm?

Defining flags in terms of other flags is always confusing.  Give them literal
values instead of defining them in terms of VM_flags.  While we're at it, move
them to a header file in preparation for the introduction of a
SHMEM_HUGETLB flag.

Signed-off-by: Adam Litke <agl@...ibm.com>
---

 include/linux/shmem_fs.h |    4 ++++
 mm/shmem.c               |    4 ----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index f3c5189..3ea0b6e 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -8,6 +8,10 @@
 
 #define SHMEM_NR_DIRECT 16
 
+/* These info->flags are used to handle pagein/truncate races efficiently */
+#define SHMEM_PAGEIN	0x00000001
+#define SHMEM_TRUNCATE	0x00000002
+
 struct shmem_inode_info {
 	spinlock_t		lock;
 	unsigned long		flags;
diff --git a/mm/shmem.c b/mm/shmem.c
index 70da7a0..a9bdb0d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -66,10 +66,6 @@
 
 #define VM_ACCT(size)    (PAGE_CACHE_ALIGN(size) >> PAGE_SHIFT)
 
-/* info->flags needs VM_flags to handle pagein/truncate races efficiently */
-#define SHMEM_PAGEIN	 VM_READ
-#define SHMEM_TRUNCATE	 VM_WRITE
-
 /* Definition to limit shmem_truncate's steps between cond_rescheds */
 #define LATENCY_LIMIT	 64
 
-
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