Re: [PATCH] bio: use a static inline function for bio_integrity_clone

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 26 Aug 2011 12:09:00 +1000
Stephen Rothwell <sfr@canb.auug.org.au> wrote:

> When CONFIG_BLK_DEV_INTEGRITY is not set, we get these warnings:
> 
> drivers/md/dm.c: In function 'split_bvec':
> drivers/md/dm.c:1061:3: warning: statement with no effect
> drivers/md/dm.c: In function 'clone_bio':
> drivers/md/dm.c:1088:3: warning: statement with no effect
> 
> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
> ---
>  include/linux/bio.h |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index ce33e68..c98ecc8 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -527,7 +527,11 @@ extern void bio_integrity_init(void);
>  #define bioset_integrity_create(a, b)	(0)
>  #define bio_integrity_prep(a)		(0)
>  #define bio_integrity_enabled(a)	(0)
> -#define bio_integrity_clone(a, b, c, d)	(0)
> +static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
> +				      gfp_t gfp_mask, struct bio_set *bs)
> +{
> +	return 0;
> +}
>  #define bioset_integrity_free(a)	do { } while (0)
>  #define bio_integrity_free(a, b)	do { } while (0)
>  #define bio_integrity_endio(a, b)	do { } while (0)

grumble@lazybones.  All those other vile macros should be similarly
converted, for this reason and for all the others.

Am too lazy to do it myself, so let's at least fix this warning until
some others turn up.