Subject: Re: [PATCH 6/6] Add support for __read_mostly to linux/cache.h

From: Sam Ravnborg <[email-masked]>
Date: Fri, 1 May 2009 11:44:07 +0200

On Thu, Apr 30, 2009 at 03:32:36PM -0400, Tim Abbott wrote:
> Signed-off-by: Tim Abbott <[email-masked]>
> ---
>  include/linux/cache.h |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/cache.h b/include/linux/cache.h
> index 97e2488..99d8a6f 100644
> --- a/include/linux/cache.h
> +++ b/include/linux/cache.h
> @@ -13,7 +13,13 @@
>  #endif
>  
>  #ifndef __read_mostly
> +#ifdef CONFIG_HAVE_READ_MOSTLY_DATA
> +#define __read_mostly __attribute__((__section__(".data.read_mostly")))
> +#define __READ_MOSTLY .section ".data.read_mostly", "aw"
> +#else
>  #define __read_mostly
> +#define __READ_MOSTLY
> +#endif /* CONFIG_HAVE_READ_MOSTLY_DATA */
>  #endif

Are there any specific reason why we do not support read_mostly on all
architectures?

read_mostly is about grouping rarely written data together
so what is needed is to introduce this section in the remaining
archtectures.

Christoph - git log says you did the inital implmentation.
Do you agree?

	Sam