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Date:   Thu, 31 Dec 2020 20:29:14 -0800
From:   Randy Dunlap <>
Cc:     Randy Dunlap <>,
        kernel test robot <>,
        Vineet Gupta <>,,
        Dan Williams <>,
        Vineet Gupta <>,
        Andrew Morton <>,
        Matthew Wilcox <>, Jan Kara <>,,
Subject: [PATCH v2] fs/dax: include <asm/page.h> to fix build error on ARC

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 <>
Signed-off-by: Randy Dunlap <>
Cc: Vineet Gupta <>
Cc: Dan Williams <>
Acked-by: Vineet Gupta <>
Cc: Andrew Morton <>
Cc: Matthew Wilcox <>
Cc: Jan Kara <>
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>
--- 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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