[PATCH v2] fs/dax: include <asm/page.h> to fix build error on ARC

[Ira Weiny]

On Thu, Dec 31, 2020 at 08:29:14PM -0800, 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> (beside copy_page()) and
> add <asm/page.h> to fs/dax.c to fix the build error.
> 
> ../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]
> 
> Fixes: cccbce671582 ("filesystem-dax: convert to dax_direct_access()")
> Reported-by: kernel test robot <lkp at intel.com>
> Signed-off-by: Randy Dunlap <rdunlap at infradead.org>

Looks reasonable
Reviewed-by: Ira Weiny <ira.weiny at intel.com>

> Cc: Vineet Gupta <vgupta at synopsys.com>
> Cc: linux-snps-arc at lists.infradead.org
> Cc: Dan Williams <dan.j.williams at intel.com>
> Acked-by: Vineet Gupta <vgupts at synopsys.com>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: Matthew Wilcox <willy at infradead.org>
> Cc: Jan Kara <jack at suse.cz>
> Cc: linux-fsdevel at vger.kernel.org
> Cc: linux-nvdimm at lists.01.org
> ---
> v2: rebase, add more Cc:
> 
>  arch/arc/include/asm/page.h |    1 +
>  fs/dax.c                    |    1 +
>  2 files changed, 2 insertions(+)
> 
> --- lnx-511-rc1.orig/fs/dax.c
> +++ lnx-511-rc1/fs/dax.c
> @@ -25,6 +25,7 @@
>  #include <linux/sizes.h>
>  #include <linux/mmu_notifier.h>
>  #include <linux/iomap.h>
> +#include <asm/page.h>
>  #include <asm/pgalloc.h>
>  
>  #define CREATE_TRACE_POINTS
> --- 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;
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