arch/arm/mm/copypage-feroceon.c:65:6: warning: no previous prototype for 'feroceon_copy_user_highpage'

From: kernel test robot
Date: Wed Apr 26 2023 - 15:06:21 EST

Next message: Marijn Suijten: "Re: [PATCH v3 06/21] drm/msm/dpu: Use V2 DITHER PINGPONG sub-block in SM8[34]50/SC8280XP"
Previous message: kernel test robot: "drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const void *'"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hi Arnd,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 5c7ecada25d2086aee607ff7deb69e77faa4aa92
commit: 8c1fb11b8a77dc489a8ef6d96c38c1297b629d06 ARM: s3c: enable s3c24xx multiplatform support
date: 1 year, 1 month ago
config: arm-randconfig-r031-20230426 (https://download.01.org/0day-ci/archive/20230427/202304270251.EhO6uTLH-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c1fb11b8a77dc489a8ef6d96c38c1297b629d06
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 8c1fb11b8a77dc489a8ef6d96c38c1297b629d06
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 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 <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304270251.EhO6uTLH-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from include/linux/gfp.h:6,
from include/linux/xarray.h:15,
from include/linux/list_lru.h:14,
from include/linux/fs.h:13,
from include/linux/highmem.h:5,
from arch/arm/mm/copypage-feroceon.c:11:
include/linux/mmzone.h: In function '__nr_to_section':
include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
1404 | if (!mem_section[SECTION_NR_TO_ROOT(nr)])
| ^
include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
| ^~~~~~~~~~~
arch/arm/mm/copypage-feroceon.c: At top level:
>> arch/arm/mm/copypage-feroceon.c:65:6: warning: no previous prototype for 'feroceon_copy_user_highpage' [-Wmissing-prototypes]
65 | void feroceon_copy_user_highpage(struct page *to, struct page *from,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm/mm/copypage-feroceon.c:78:6: warning: no previous prototype for 'feroceon_clear_user_highpage' [-Wmissing-prototypes]
78 | void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/feroceon_copy_user_highpage +65 arch/arm/mm/copypage-feroceon.c

063b0a4207e43a Russell King 2008-10-31 @11 #include <linux/highmem.h>
d73e60b7144a86 Russell King 2008-10-31 12
b99afae1390140 Nicolas Pitre 2018-11-07 13 static void feroceon_copy_user_page(void *kto, const void *kfrom)
d73e60b7144a86 Russell King 2008-10-31 14 {
b99afae1390140 Nicolas Pitre 2018-11-07 15 int tmp;
b99afae1390140 Nicolas Pitre 2018-11-07 16
b99afae1390140 Nicolas Pitre 2018-11-07 17 asm volatile ("\
b99afae1390140 Nicolas Pitre 2018-11-07 18 1: ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 19 pld [%1, #0] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 20 pld [%1, #32] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 21 pld [%1, #64] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 22 pld [%1, #96] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 23 pld [%1, #128] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 24 pld [%1, #160] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 25 pld [%1, #192] \n\
b99afae1390140 Nicolas Pitre 2018-11-07 26 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 27 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 28 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 29 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 30 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 31 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 32 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 33 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 34 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 35 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 36 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 37 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 38 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 39 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 40 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 41 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 42 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 43 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 44 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 45 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 46 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 47 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 48 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 49 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 50 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 51 ldmia %1!, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 52 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 53 add %0, %0, #32 \n\
b99afae1390140 Nicolas Pitre 2018-11-07 54 stmia %0, {r2 - r7, ip, lr} \n\
b99afae1390140 Nicolas Pitre 2018-11-07 55 subs %2, %2, #(32 * 8) \n\
b99afae1390140 Nicolas Pitre 2018-11-07 56 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
b99afae1390140 Nicolas Pitre 2018-11-07 57 add %0, %0, #32 \n\
d73e60b7144a86 Russell King 2008-10-31 58 bne 1b \n\
b99afae1390140 Nicolas Pitre 2018-11-07 59 mcr p15, 0, %2, c7, c10, 4 @ drain WB"
b99afae1390140 Nicolas Pitre 2018-11-07 60 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
b99afae1390140 Nicolas Pitre 2018-11-07 61 : "2" (PAGE_SIZE)
b99afae1390140 Nicolas Pitre 2018-11-07 62 : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
d73e60b7144a86 Russell King 2008-10-31 63 }
d73e60b7144a86 Russell King 2008-10-31 64
063b0a4207e43a Russell King 2008-10-31 @65 void feroceon_copy_user_highpage(struct page *to, struct page *from,
f00a75c094c340 Russell King 2009-10-05 66 unsigned long vaddr, struct vm_area_struct *vma)
063b0a4207e43a Russell King 2008-10-31 67 {
063b0a4207e43a Russell King 2008-10-31 68 void *kto, *kfrom;
063b0a4207e43a Russell King 2008-10-31 69
5472e862de2bc4 Cong Wang 2011-11-25 70 kto = kmap_atomic(to);
5472e862de2bc4 Cong Wang 2011-11-25 71 kfrom = kmap_atomic(from);
2725898fc9bb21 Russell King 2009-10-05 72 flush_cache_page(vma, vaddr, page_to_pfn(from));
063b0a4207e43a Russell King 2008-10-31 73 feroceon_copy_user_page(kto, kfrom);
5472e862de2bc4 Cong Wang 2011-11-25 74 kunmap_atomic(kfrom);
5472e862de2bc4 Cong Wang 2011-11-25 75 kunmap_atomic(kto);
063b0a4207e43a Russell King 2008-10-31 76 }
063b0a4207e43a Russell King 2008-10-31 77
303c6443659bc1 Russell King 2008-10-31 @78 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
d73e60b7144a86 Russell King 2008-10-31 79 {
5472e862de2bc4 Cong Wang 2011-11-25 80 void *ptr, *kaddr = kmap_atomic(page);
43ae286b7d4d8c Nicolas Pitre 2008-11-04 81 asm volatile ("\
43ae286b7d4d8c Nicolas Pitre 2008-11-04 82 mov r1, %2 \n\
d73e60b7144a86 Russell King 2008-10-31 83 mov r2, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 84 mov r3, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 85 mov r4, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 86 mov r5, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 87 mov r6, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 88 mov r7, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 89 mov ip, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 90 mov lr, #0 \n\
303c6443659bc1 Russell King 2008-10-31 91 1: stmia %0, {r2-r7, ip, lr} \n\
d73e60b7144a86 Russell King 2008-10-31 92 subs r1, r1, #1 \n\
303c6443659bc1 Russell King 2008-10-31 93 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
43ae286b7d4d8c Nicolas Pitre 2008-11-04 94 add %0, %0, #32 \n\
d73e60b7144a86 Russell King 2008-10-31 95 bne 1b \n\
303c6443659bc1 Russell King 2008-10-31 96 mcr p15, 0, r1, c7, c10, 4 @ drain WB"
43ae286b7d4d8c Nicolas Pitre 2008-11-04 97 : "=r" (ptr)
43ae286b7d4d8c Nicolas Pitre 2008-11-04 98 : "0" (kaddr), "I" (PAGE_SIZE / 32)
303c6443659bc1 Russell King 2008-10-31 99 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
5472e862de2bc4 Cong Wang 2011-11-25 100 kunmap_atomic(kaddr);
d73e60b7144a86 Russell King 2008-10-31 101 }
d73e60b7144a86 Russell King 2008-10-31 102

:::::: The code at line 65 was first introduced by commit
:::::: 063b0a4207e43acbeff3d4b09f43e750e0212b48 [ARM] copypage: provide our own copy_user_highpage()

:::::: TO: Russell King <rmk@xxxxxxxxxxxxxxxxxxxxxxx>
:::::: CC: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

Next message: Marijn Suijten: "Re: [PATCH v3 06/21] drm/msm/dpu: Use V2 DITHER PINGPONG sub-block in SM8[34]50/SC8280XP"
Previous message: kernel test robot: "drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const void *'"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]