On Wed, 7 Feb 2007, Adam Litke wrote:
>
> 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.
NAK. Look further and you'll find at least VM_LOCKED and VM_ACCOUNT
also used straight in shmem info->flags: it's trying to ensure there
won't be a clash when applying VM_flags there. So you've a choice of
three ways forward, I don't mind which: (a) leave it alone, (b) add
comments, (c) define a separate set of flags for SHMEM and convert
where necessary. But NAK to this patch.
(Sorry, I'm way behind and haven't checked your earlier mails yet.)
Hugh
>
> Signed-off-by: Adam Litke <[EMAIL PROTECTED]>
> ---
>
> 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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