linux-kernel - Re: [PATCH] sh: add copy_user_page() alias for __copy

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Date:	Thu, 8 Oct 2015 17:07:34 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] sh: add copy_user_page() alias for __copy_user()

On Tue, Sep 22, 2015 at 03:46:51PM -0600, Ross Zwisler wrote:
> copy_user_page() is needed by DAX.  Without this we get a compile error
> for DAX on SH:
> 
> fs/dax.c:280:2: error: implicit declaration of function ‘copy_user_page’
> [-Werror=implicit-function-declaration]
>   copy_user_page(vto, (void __force *)vfrom, vaddr, to);
>     ^
> 
> This was done with a random config that happened to include DAX support.
> 
> This patch has only been compile tested.
> 
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> Apologies for the resend, I wanted to add some more recipients.
> ---
>  arch/sh/include/asm/page.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h
> index fe20d14..ceb5201 100644
> --- a/arch/sh/include/asm/page.h
> +++ b/arch/sh/include/asm/page.h
> @@ -59,6 +59,7 @@ pages_do_alias(unsigned long addr1, unsigned long addr2)
>  
>  #define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
>  extern void copy_page(void *to, void *from);
> +#define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
>  
>  struct page;
>  struct vm_area_struct;

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