From: Randy Dunlap <redacted>

[ Upstream commit 8a48c0a3360bf2bf4f40c980d0ec216e770e58ee ]

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 <redacted>
Signed-off-by: Randy Dunlap <redacted>
Cc: Vineet Gupta <redacted>
Cc: linux-snps-arc@lists.infradead.org
Cc: Dan Williams <redacted>
#Acked-by: Vineet Gupta [off-list ref] # 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 [off-list ref] # v2
Signed-off-by: Vineet Gupta <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arc/include/asm/page.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arc/include/asm/page.h b/arch/arc/include/asm/page.h
index 0a32e8cfd074d..bcd1920ae75a3 100644
--- a/arch/arc/include/asm/page.h
+++ b/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;

-- 
2.27.0