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Date:   Tue, 12 Jan 2021 07:57:20 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        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-nvdimm@...ts.01.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 11/16] arch/arc: add copy_user_page() to <asm/page.h> to fix build error on ARC

From: Randy Dunlap <rdunlap@...radead.org>

[ 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 <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
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 09ddddf71cc50..a70fef79c4055 100644
--- a/arch/arc/include/asm/page.h
+++ b/arch/arc/include/asm/page.h
@@ -13,6 +13,7 @@
 #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

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