linux-kernel - Re: [PATCH] blackfin: include: asm: pgtable: Define dummy pgprot

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Message-ID: <CAFLxGvwSky9feTHdciR2mjWnrDKqVNjPRD=cQ=YTCgBngKPPvw@mail.gmail.com>
Date:	Sat, 4 Apr 2015 00:50:42 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Chen Gang <xili_gchen_5257@...mail.com>
Cc:	realmz6@...il.com,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blackfin: include: asm: pgtable: Define dummy pgprot_writecombine

On Fri, Apr 3, 2015 at 10:36 PM, Chen Gang <xili_gchen_5257@...mail.com> wrote:
> It is copied from asm-generic, the related error with allmodconfig:
>
>     CC [M]  sound/core/pcm_native.o
>   sound/core/pcm_native.c: In function 'snd_pcm_lib_default_mmap':
>   sound/core/pcm_native.c:3387:24: error: implicit declaration of function 'pgprot_writecombine' [-Werror=implicit-function-declaration]
>      area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
>                           ^
>   sound/core/pcm_native.c:3387:22: error: incompatible types when assigning to type 'pgprot_t {aka struct <anonymous>}' from type 'int'
>      area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
>                         ^
>
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  arch/blackfin/include/asm/pgtable.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/blackfin/include/asm/pgtable.h b/arch/blackfin/include/asm/pgtable.h
> index b88a155..3e730d9 100644
> --- a/arch/blackfin/include/asm/pgtable.h
> +++ b/arch/blackfin/include/asm/pgtable.h
> @@ -36,6 +36,7 @@ typedef pte_t *pte_addr_t;
>  #define PAGE_READONLY          __pgprot(0)     /* these mean nothing to NO_MM */
>  #define PAGE_KERNEL            __pgprot(0)     /* these mean nothing to NO_MM */
>  #define pgprot_noncached(prot) (prot)
> +#define pgprot_writecombine    pgprot_noncached

This looks fishy as blackfin's pgtable.h already includes asm-generic/pgtable.h.
So, copy&pasting pgprot_writecombine shouldn't be needed.

-- 
Thanks,
//richard
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