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

[Vineet Gupta <Vineet.Gupta1@synopsys.com>]

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@intel.com>
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: linux-snps-arc@lists.infradead.org
> Cc: Dan Williams <dan.j.williams@intel.com>
> #Acked-by: Vineet Gupta <vgupta@synopsys.com> # v1
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Jan Kara <jack@suse.cz>
> Cc: linux-fsdevel@vger.kernel.org
> Cc: linux-nvdimm@lists.01.org
> #Reviewed-by: Ira Weiny <ira.weiny@intel.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;
>