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ESMTP; 16 Apr 2023 12:40:14 -0700 Received: from kbuild by b613635ddfff with local (Exim 4.96) (envelope-from ) id 1po8EP-000bot-38; Sun, 16 Apr 2023 19:40:13 +0000 Date: Mon, 17 Apr 2023 03:39:44 +0800 From: kernel test robot To: Arnd Bergmann Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org Subject: arch/arm/mm/copypage-v4wb.c:47:6: warning: no previous prototype for function 'v4wb_copy_user_highpage' Message-ID: <202304170326.6P0CVjp4-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arnd, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 3e7bb4f2461710b70887704af7f175383251088e commit: 250c1a694ff304e5d69e74ab32755eddcc2b8f65 ARM: pxa: convert to multiplatform date: 11 months ago config: arm-randconfig-r025-20230416 (https://download.01.org/0day-ci/archive/20230417/202304170326.6P0CVjp4-lkp@intel.com/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 9638da200e00bd069e6dd63604e14cbafede9324) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=250c1a694ff304e5d69e74ab32755eddcc2b8f65 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 250c1a694ff304e5d69e74ab32755eddcc2b8f65 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mach-versatile/ arch/arm/mm/ drivers/clk/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Link: https://lore.kernel.org/oe-kbuild-all/202304170326.6P0CVjp4-lkp@intel.com/ All warnings (new ones prefixed by >>): >> arch/arm/mm/copypage-v4wb.c:47:6: warning: no previous prototype for function 'v4wb_copy_user_highpage' [-Wmissing-prototypes] void v4wb_copy_user_highpage(struct page *to, struct page *from, ^ arch/arm/mm/copypage-v4wb.c:47:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void v4wb_copy_user_highpage(struct page *to, struct page *from, ^ static >> arch/arm/mm/copypage-v4wb.c:65:6: warning: no previous prototype for function 'v4wb_clear_user_highpage' [-Wmissing-prototypes] void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr) ^ arch/arm/mm/copypage-v4wb.c:65:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr) ^ static 2 warnings generated. -- >> arch/arm/mm/copypage-feroceon.c:65:6: warning: no previous prototype for function 'feroceon_copy_user_highpage' [-Wmissing-prototypes] void feroceon_copy_user_highpage(struct page *to, struct page *from, ^ arch/arm/mm/copypage-feroceon.c:65:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void feroceon_copy_user_highpage(struct page *to, struct page *from, ^ static >> arch/arm/mm/copypage-feroceon.c:78:6: warning: no previous prototype for function 'feroceon_clear_user_highpage' [-Wmissing-prototypes] void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) ^ arch/arm/mm/copypage-feroceon.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) ^ static 2 warnings generated. -- >> arch/arm/mm/copypage-xscale.c:84:6: warning: no previous prototype for function 'xscale_mc_copy_user_highpage' [-Wmissing-prototypes] void xscale_mc_copy_user_highpage(struct page *to, struct page *from, ^ arch/arm/mm/copypage-xscale.c:84:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void xscale_mc_copy_user_highpage(struct page *to, struct page *from, ^ static >> arch/arm/mm/copypage-xscale.c:107:1: warning: no previous prototype for function 'xscale_mc_clear_user_highpage' [-Wmissing-prototypes] xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr) ^ arch/arm/mm/copypage-xscale.c:106:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void ^ static 2 warnings generated. vim +/v4wb_copy_user_highpage +47 arch/arm/mm/copypage-v4wb.c d73e60b7144a86b Russell King 2008-10-31 46 063b0a4207e43ac Russell King 2008-10-31 @47 void v4wb_copy_user_highpage(struct page *to, struct page *from, f00a75c094c340c Russell King 2009-10-05 48 unsigned long vaddr, struct vm_area_struct *vma) 063b0a4207e43ac Russell King 2008-10-31 49 { 063b0a4207e43ac Russell King 2008-10-31 50 void *kto, *kfrom; 063b0a4207e43ac Russell King 2008-10-31 51 5472e862de2bc4a Cong Wang 2011-11-25 52 kto = kmap_atomic(to); 5472e862de2bc4a Cong Wang 2011-11-25 53 kfrom = kmap_atomic(from); 2725898fc9bb212 Russell King 2009-10-05 54 flush_cache_page(vma, vaddr, page_to_pfn(from)); 063b0a4207e43ac Russell King 2008-10-31 55 v4wb_copy_user_page(kto, kfrom); 5472e862de2bc4a Cong Wang 2011-11-25 56 kunmap_atomic(kfrom); 5472e862de2bc4a Cong Wang 2011-11-25 57 kunmap_atomic(kto); 063b0a4207e43ac Russell King 2008-10-31 58 } 063b0a4207e43ac Russell King 2008-10-31 59 d73e60b7144a86b Russell King 2008-10-31 60 /* d73e60b7144a86b Russell King 2008-10-31 61 * ARMv4 optimised clear_user_page d73e60b7144a86b Russell King 2008-10-31 62 * d73e60b7144a86b Russell King 2008-10-31 63 * Same story as above. d73e60b7144a86b Russell King 2008-10-31 64 */ 303c6443659bc1d Russell King 2008-10-31 @65 void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr) d73e60b7144a86b Russell King 2008-10-31 66 { 5472e862de2bc4a Cong Wang 2011-11-25 67 void *ptr, *kaddr = kmap_atomic(page); 43ae286b7d4d8c4 Nicolas Pitre 2008-11-04 68 asm volatile("\ 43ae286b7d4d8c4 Nicolas Pitre 2008-11-04 69 mov r1, %2 @ 1\n\ d73e60b7144a86b Russell King 2008-10-31 70 mov r2, #0 @ 1\n\ d73e60b7144a86b Russell King 2008-10-31 71 mov r3, #0 @ 1\n\ d73e60b7144a86b Russell King 2008-10-31 72 mov ip, #0 @ 1\n\ d73e60b7144a86b Russell King 2008-10-31 73 mov lr, #0 @ 1\n\ 303c6443659bc1d Russell King 2008-10-31 74 1: mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\ 303c6443659bc1d Russell King 2008-10-31 75 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 303c6443659bc1d Russell King 2008-10-31 76 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 303c6443659bc1d Russell King 2008-10-31 77 mcr p15, 0, %0, c7, c6, 1 @ 1 invalidate D line\n\ 303c6443659bc1d Russell King 2008-10-31 78 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 303c6443659bc1d Russell King 2008-10-31 79 stmia %0!, {r2, r3, ip, lr} @ 4\n\ d73e60b7144a86b Russell King 2008-10-31 80 subs r1, r1, #1 @ 1\n\ d73e60b7144a86b Russell King 2008-10-31 81 bne 1b @ 1\n\ 303c6443659bc1d Russell King 2008-10-31 82 mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" 43ae286b7d4d8c4 Nicolas Pitre 2008-11-04 83 : "=r" (ptr) 43ae286b7d4d8c4 Nicolas Pitre 2008-11-04 84 : "0" (kaddr), "I" (PAGE_SIZE / 64) 303c6443659bc1d Russell King 2008-10-31 85 : "r1", "r2", "r3", "ip", "lr"); 5472e862de2bc4a Cong Wang 2011-11-25 86 kunmap_atomic(kaddr); d73e60b7144a86b Russell King 2008-10-31 87 } d73e60b7144a86b Russell King 2008-10-31 88 :::::: The code at line 47 was first introduced by commit :::::: 063b0a4207e43acbeff3d4b09f43e750e0212b48 [ARM] copypage: provide our own copy_user_highpage() :::::: TO: Russell King :::::: CC: Russell King -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests