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Subject[PATCH] Define the shmem_inode_info flags directly
Date

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@us.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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