linux-kernel - Re: false positives with checkpatch

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Date:	Fri, 07 Aug 2015 08:37:47 -0700
From:	Joe Perches <joe@...ches.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	Andy Whitcroft <apw@...onical.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, 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|


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