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Date: Mon, 17 Apr 2023 03:39:44 +0800
From: kernel test robot <lkp@...el.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: arch/arm/mm/copypage-v4wb.c:47:6: warning: no previous prototype for
function 'v4wb_copy_user_highpage'
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 <lkp@...el.com>
| 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 <rmk@...-67.arm.linux.org.uk>
:::::: CC: Russell King <rmk+kernel@....linux.org.uk>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
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