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Sun, 22 Jan 2023 19:28:36 +0000 Date: Mon, 23 Jan 2023 03:27:42 +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-xscale.c:84:6: warning: no previous prototype for function 'xscale_mc_copy_user_highpage' Message-ID: <202301230336.JTD7TDdA-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: 2241ab53cbb5cdb08a6b2d4688feb13971058f65 commit: 7036440eab3e2d47a775d4616909f8235488d714 ARM: omap1: enable multiplatform date: 8 months ago config: arm-randconfig-r046-20230122 (https://download.01.org/0day-ci/archive/20230123/202301230336.JTD7TDdA-lkp@intel.com/config) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a) 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=7036440eab3e2d47a775d4616909f8235488d714 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7036440eab3e2d47a775d4616909f8235488d714 # 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/mm/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> 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 +/xscale_mc_copy_user_highpage +84 arch/arm/mm/copypage-xscale.c f8f98a9335db4a Russell King 2005-06-08 83 063b0a4207e43a Russell King 2008-10-31 @84 void xscale_mc_copy_user_highpage(struct page *to, struct page *from, f00a75c094c340 Russell King 2009-10-05 85 unsigned long vaddr, struct vm_area_struct *vma) f8f98a9335db4a Russell King 2005-06-08 86 { 5472e862de2bc4 Cong Wang 2011-11-25 87 void *kto = kmap_atomic(to); 1c9d3df5e88ad7 Richard Purdie 2006-12-30 88 c01778001a4f5a Catalin Marinas 2010-09-13 89 if (!test_and_set_bit(PG_dcache_clean, &from->flags)) cb9f753a3731f7 Huang Ying 2018-04-05 90 __flush_dcache_page(page_mapping_file(from), from); 1c9d3df5e88ad7 Richard Purdie 2006-12-30 91 bd31b85960a7fc Thomas Gleixner 2009-07-03 92 raw_spin_lock(&minicache_lock); f8f98a9335db4a Russell King 2005-06-08 93 67ece1443174d8 Russell King 2011-07-02 94 set_top_pte(COPYPAGE_MINICACHE, mk_pte(from, minicache_pgprot)); f8f98a9335db4a Russell King 2005-06-08 95 f8f98a9335db4a Russell King 2005-06-08 96 mc_copy_user_page((void *)COPYPAGE_MINICACHE, kto); f8f98a9335db4a Russell King 2005-06-08 97 bd31b85960a7fc Thomas Gleixner 2009-07-03 98 raw_spin_unlock(&minicache_lock); 063b0a4207e43a Russell King 2008-10-31 99 5472e862de2bc4 Cong Wang 2011-11-25 100 kunmap_atomic(kto); f8f98a9335db4a Russell King 2005-06-08 101 } f8f98a9335db4a Russell King 2005-06-08 102 f8f98a9335db4a Russell King 2005-06-08 103 /* f8f98a9335db4a Russell King 2005-06-08 104 * XScale optimised clear_user_page f8f98a9335db4a Russell King 2005-06-08 105 */ 303c6443659bc1 Russell King 2008-10-31 106 void 303c6443659bc1 Russell King 2008-10-31 @107 xscale_mc_clear_user_highpage(struct page *page, unsigned long vaddr) f8f98a9335db4a Russell King 2005-06-08 108 { 5472e862de2bc4 Cong Wang 2011-11-25 109 void *ptr, *kaddr = kmap_atomic(page); c7b68049943079 Arnd Bergmann 2019-08-09 110 asm volatile("\ c7b68049943079 Arnd Bergmann 2019-08-09 111 .arch xscale \n\ c7b68049943079 Arnd Bergmann 2019-08-09 112 mov r1, %2 \n\ f8f98a9335db4a Russell King 2005-06-08 113 mov r2, #0 \n\ f8f98a9335db4a Russell King 2005-06-08 114 mov r3, #0 \n\ 303c6443659bc1 Russell King 2008-10-31 115 1: mov ip, %0 \n\ bc2eca9a682881 Nicolas Pitre 2018-11-09 116 strd r2, r3, [%0], #8 \n\ bc2eca9a682881 Nicolas Pitre 2018-11-09 117 strd r2, r3, [%0], #8 \n\ bc2eca9a682881 Nicolas Pitre 2018-11-09 118 strd r2, r3, [%0], #8 \n\ bc2eca9a682881 Nicolas Pitre 2018-11-09 119 strd r2, r3, [%0], #8 \n\ f8f98a9335db4a Russell King 2005-06-08 120 mcr p15, 0, ip, c7, c10, 1 @ clean D line\n\ f8f98a9335db4a Russell King 2005-06-08 121 subs r1, r1, #1 \n\ f8f98a9335db4a Russell King 2005-06-08 122 mcr p15, 0, ip, c7, c6, 1 @ invalidate D line\n\ 303c6443659bc1 Russell King 2008-10-31 123 bne 1b" 43ae286b7d4d8c Nicolas Pitre 2008-11-04 124 : "=r" (ptr) 43ae286b7d4d8c Nicolas Pitre 2008-11-04 125 : "0" (kaddr), "I" (PAGE_SIZE / 32) 303c6443659bc1 Russell King 2008-10-31 126 : "r1", "r2", "r3", "ip"); 5472e862de2bc4 Cong Wang 2011-11-25 127 kunmap_atomic(kaddr); f8f98a9335db4a Russell King 2005-06-08 128 } f8f98a9335db4a Russell King 2005-06-08 129 :::::: The code at line 84 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