linux-kernel - Re: [PATCH v3] arch/arc: add copy_user_page() to <asm/page.h> to fix build error on ARC

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Date:   Tue, 5 Jan 2021 05:07:05 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     kernel test robot <lkp@...el.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH v3] arch/arc: add copy_user_page() to <asm/page.h> to fix
 build error on ARC

On 1/4/21 7:44 PM, Randy Dunlap wrote:
> fs/dax.c uses copy_user_page() but ARC does not provide that interface,
> resulting in a build error.
> 
> Provide copy_user_page() in <asm/page.h>.
> 
> ../fs/dax.c: In function 'copy_cow_page_dax':
> ../fs/dax.c:702:2: error: implicit declaration of function 'copy_user_page'; did you mean 'copy_to_user_page'? [-Werror=implicit-function-declaration]
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Vineet Gupta <vgupta@...opsys.com>
> Cc: linux-snps-arc@...ts.infradead.org
> Cc: Dan Williams <dan.j.williams@...el.com>
> #Acked-by: Vineet Gupta <vgupta@...opsys.com> # v1
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Jan Kara <jack@...e.cz>
> Cc: linux-fsdevel@...r.kernel.org
> Cc: linux-nvdimm@...ts.01.org
> #Reviewed-by: Ira Weiny <ira.weiny@...el.com> # v2

Added to arc #for-curr.

Thx,
-Vineet

> ---
> v2: rebase, add more Cc:
> v3: add copy_user_page() to arch/arc/include/asm/page.h
> 
>   arch/arc/include/asm/page.h |    1 +
> 
> --- lnx-511-rc1.orig/arch/arc/include/asm/page.h
> +++ lnx-511-rc1/arch/arc/include/asm/page.h
> @@ -10,6 +10,7 @@
>   #ifndef __ASSEMBLY__
>   
>   #define clear_page(paddr)		memset((paddr), 0, PAGE_SIZE)
> +#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
>   #define copy_page(to, from)		memcpy((to), (from), PAGE_SIZE)
>   
>   struct vm_area_struct;
>