linux-kernel - Re: [next:akpm 798/1000] drivers/rtc/rtc-ds1286.c:343:24: sparse: incorrect type in argument 1 (different address spaces)

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Date:	Mon, 22 Apr 2013 19:56:19 -0700
From:	Christopher Li <sparse@...isli.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	kbuild test robot <fengguang.wu@...el.com>,
	Jingoo Han <jg1.han@...sung.com>, kbuild-all@...org,
	Linux-Sparse <linux-sparse@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [next:akpm 798/1000] drivers/rtc/rtc-ds1286.c:343:24: sparse:
 incorrect type in argument 1 (different address spaces)

On Mon, Apr 22, 2013 at 4:56 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> I think doing IS_ERR() and PTR_ERR() on __iomem pointers is a natural
> thing, and we should be able to do this without adding call-site
> trickery to make sparse happy.
>
> Is there some sort of annotation which we can add to the
> IS_ERR()/PTR_ERR() definitions so that sparse will stop warning about
> this usage?

Yes, the force attribute should silent the address check on conversion.

Can some one try this patch (totally untested).

Chris


diff --git a/include/linux/err.h b/include/linux/err.h
index f2edce2..d226a3c 100644
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -26,17 +26,17 @@ static inline void * __must_check ERR_PTR(long error)

 static inline long __must_check PTR_ERR(const void *ptr)
 {
-       return (long) ptr;
+       return (__force long) ptr;
 }

 static inline long __must_check IS_ERR(const void *ptr)
 {
-       return IS_ERR_VALUE((unsigned long)ptr);
+       return IS_ERR_VALUE((__force unsigned long)ptr);
 }

 static inline long __must_check IS_ERR_OR_NULL(const void *ptr)
 {
-       return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+       return !ptr || IS_ERR_VALUE((__force unsigned long)ptr);
 }

 /**
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