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[PATCH] mm: fix up sparse warning in gfpflags_allow_blocking

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  [PATCH] mm: fix up sparse warning in gfpflags_allow_blocking Jeff Layton <jlayton@poochiereds.net> - 2015-11-20 15:50 +0100
    Re: [PATCH] mm: fix up sparse warning in gfpflags_allow_blocking Michal Hocko <mhocko@kernel.org> - 2015-11-23 11:00 +0100
      Re: [PATCH] mm: fix up sparse warning in gfpflags_allow_blocking Jeff Layton <jlayton@poochiereds.net> - 2015-11-23 13:00 +0100

#1274128 — [PATCH] mm: fix up sparse warning in gfpflags_allow_blocking

sparse says:

    include/linux/gfp.h:274:26: warning: incorrect type in return expression (different base types)
    include/linux/gfp.h:274:26:    expected bool
    include/linux/gfp.h:274:26:    got restricted gfp_t

...add a forced cast to silence the warning.

Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
---
 include/linux/gfp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 6523109e136d..8942af0813e3 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -271,7 +271,7 @@ static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
 
 static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
 {
-	return gfp_flags & __GFP_DIRECT_RECLAIM;
+	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);
 }
 
 #ifdef CONFIG_HIGHMEM
-- 
2.4.3

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#1275196

On Fri 20-11-15 09:40:59, Jeff Layton wrote:
> sparse says:
> 
>     include/linux/gfp.h:274:26: warning: incorrect type in return expression (different base types)
>     include/linux/gfp.h:274:26:    expected bool
>     include/linux/gfp.h:274:26:    got restricted gfp_t
> 
> ...add a forced cast to silence the warning.
> 
> Cc: Mel Gorman <mgorman@techsingularity.net>
> Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
> ---
>  include/linux/gfp.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index 6523109e136d..8942af0813e3 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -271,7 +271,7 @@ static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
>  
>  static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
>  {
> -	return gfp_flags & __GFP_DIRECT_RECLAIM;
> +	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);

Wouldn't (gfp_flags & __GFP_DIRECT_RECLAIM) != 0 be easier/better to read?

-- 
Michal Hocko
SUSE Labs
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#1275264

On Mon, 23 Nov 2015 10:50:49 +0100
Michal Hocko <mhocko@kernel.org> wrote:

> On Fri 20-11-15 09:40:59, Jeff Layton wrote:
> > sparse says:
> > 
> >     include/linux/gfp.h:274:26: warning: incorrect type in return expression (different base types)
> >     include/linux/gfp.h:274:26:    expected bool
> >     include/linux/gfp.h:274:26:    got restricted gfp_t
> > 
> > ...add a forced cast to silence the warning.
> > 
> > Cc: Mel Gorman <mgorman@techsingularity.net>
> > Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
> > ---
> >  include/linux/gfp.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> > index 6523109e136d..8942af0813e3 100644
> > --- a/include/linux/gfp.h
> > +++ b/include/linux/gfp.h
> > @@ -271,7 +271,7 @@ static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
> >  
> >  static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
> >  {
> > -	return gfp_flags & __GFP_DIRECT_RECLAIM;
> > +	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);
> 
> Wouldn't (gfp_flags & __GFP_DIRECT_RECLAIM) != 0 be easier/better to read?
> 

Yeah, good point. Andrew, do you want me to respin that?

-- 
Jeff Layton <jlayton@poochiereds.net>
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