This is a note to let you know that I've just added the patch titled ARC: export clear_user_page() for modules to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arc-export-clear_user_page-for-modules.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit b4d3a2a4e54db75141e1c28b8df0090d3302aec6 Author: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Date: Mon Aug 16 14:05:33 2021 -0700 ARC: export clear_user_page() for modules [ Upstream commit 6b5ff0405e4190f23780362ea324b250bc495683 ] 0day bot reports a build error: ERROR: modpost: "clear_user_page" [drivers/media/v4l2-core/videobuf-dma-sg.ko] undefined! so export it in arch/arc/ to fix the build error. In most ARCHes, clear_user_page() is a macro. OTOH, in a few ARCHes it is a function and needs to be exported. PowerPC exported it in 2004. It looks like nds32 and nios2 still need to have it exported. Fixes: 4102b53392d63 ("ARC: [mm] Aliasing VIPT dcache support 2/4") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: kernel test robot <lkp@xxxxxxxxx> Cc: Guenter Roeck <linux@xxxxxxxxxxxx> Cc: linux-snps-arc@xxxxxxxxxxxxxxxxxxx Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c index 017fb440bba4..f425405a8a76 100644 --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -904,7 +904,7 @@ void clear_user_page(void *to, unsigned long u_vaddr, struct page *page) clear_page(to); clear_bit(PG_dc_clean, &page->flags); } - +EXPORT_SYMBOL(clear_user_page); /********************************************************************** * Explicit Cache flush request from user space via syscall