linux-kernel - [PATCH v2] mm: fix noisy sparse warning in LIBCFS_ALLOC

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Date:	Sat, 26 Dec 2015 22:39:31 -0800
From:	Joshua Clayton <stillcompiling@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org
Subject: [PATCH v2] mm: fix noisy sparse warning in LIBCFS_ALLOC_PRE()

running sparse on drivers/staging/lustre results in dozens of warnings:
include/linux/gfp.h:281:41: warning:
odd constant _Bool cast (400000 becomes 1)

Use "!!" to explicitly convert to bool and get rid of the warning.

Signed-off-by: Joshua Clayton <stillcompiling@...il.com>
---

On Sunday, December 27, 2015 05:41:17 AM Al Viro wrote:
> On Sat, Dec 26, 2015 at 09:12:42PM -0800, Joshua Clayton wrote:
> > running sparse on drivers/staging/lustre results in dozens of warnings:
> > include/linux/gfp.h:281:41: warning:
> > odd constant _Bool cast (400000 becomes 1)
> > 
> > Use "!!" to explicitly convert the result to bool range.
> 
> ... and the cast to bool is left in order to...?
> 
> > -	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);
> > +	return (bool __force)!!(gfp_flags & __GFP_DIRECT_RECLAIM);
to embarrass me, I suppose. :(
I didn't think about the redundancy of the cast.
Lets try that again.

 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 91f74e7..28ad5f6 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -278,7 +278,7 @@ static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
 
 static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
 {
-	return (bool __force)(gfp_flags & __GFP_DIRECT_RECLAIM);
+	return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
 }
 
 #ifdef CONFIG_HIGHMEM
-- 
2.6.4



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