linux-kernel - Re: false positives with checkpatch

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Date:	Fri, 7 Aug 2015 17:12:15 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"sparse@...isli.org" <sparse@...isli.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: false positives with checkpatch

On Fri, Aug 07, 2015 at 08:37:47AM -0700, Joe Perches wrote:
> On Fri, 2015-08-07 at 09:01 -0600, Ross Zwisler wrote:
> > When running checkpatch.pl against my latest patch set, I hit what I think are
> > two false positives.  Here are the related lines:
> > 
> > 	+static inline void flush_cache_pmem(void __pmem *addr, size_t size)
> > 	+{
> > 	+       if (arch_has_pmem_api())
> > 	+               arch_flush_cache_pmem(addr, size);
> > 	+}
> > 
> > The error was:
> > 
> > 	ERROR: need consistent spacing around '*' (ctx:WxV)
> > 	#88: FILE: include/linux/pmem.h:167:
> > 	+static inline void flush_cache_pmem(void __pmem *addr, size_t size)
> > 							 ^
> > The (void __annotation *variable) syntax is correct, I believe, and is used
> > consistently for both __iomem and __pmem annotations.
> 
> checkpatch doesn't know what a __pmem is.
> Neither did I until a second ago.
> 
> Are there any other sparse annotations that were
> added by this subsystem? (I don't notice any)
> 
> They need to be added to checkpatch's $Sparse use
> so there's a patch proposal below this.
> 
> It looks like compiler.h's #define __safe is unused
> in the linux kernel and it could be deleted as it's
> not a gcc attribute.
> 
> Does anyone know?
> 
> Linus' commit is unrevealing.
> 
> commit e6b8f25bd950947d06c59432cbafd320dda66abf
> Author: Linus Torvalds <torvalds@....osdl.org>
> Date:   Fri Apr 16 03:49:32 2004 -0700
> 
>     Add sparse __safe annotation
> 
> ---
>  scripts/checkpatch.pl | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index fd8e502..6362ec3 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -264,6 +264,7 @@ our $Sparse	= qr{
>  			__kernel|
>  			__force|
>  			__iomem|
> +			__pmem|
>  			__must_check|
>  			__init_refok|
>  			__kprobes|

Looks good to me.

-apw
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