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Subjectarch/arm/mach-ixp4xx/common-pci.c:143:5: warning: no previous prototype for function 'ixp4xx_pci_write'
Hi Linus,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: daadb3bd0e8d3e317e36bc2c1542e86c528665e5
commit: d5d9f7ac58ea1041375a028f143ca5784693ea86 ARM/ixp4xx: Make NEED_MACH_IO_H optional
date: 7 months ago
config: arm-ixp4xx_defconfig (https://download.01.org/0day-ci/archive/20220113/202201130136.7675O5xx-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 244dd2913a43a200f5a6544d424cdc37b771028b)
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=d5d9f7ac58ea1041375a028f143ca5784693ea86
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d5d9f7ac58ea1041375a028f143ca5784693ea86
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

arch/arm/mach-ixp4xx/common-pci.c:94:5: warning: no previous prototype for function 'ixp4xx_pci_read_errata' [-Wmissing-prototypes]
int ixp4xx_pci_read_errata(u32 addr, u32 cmd, u32* data)
^
arch/arm/mach-ixp4xx/common-pci.c:94:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int ixp4xx_pci_read_errata(u32 addr, u32 cmd, u32* data)
^
static
arch/arm/mach-ixp4xx/common-pci.c:121:5: warning: no previous prototype for function 'ixp4xx_pci_read_no_errata' [-Wmissing-prototypes]
int ixp4xx_pci_read_no_errata(u32 addr, u32 cmd, u32* data)
^
arch/arm/mach-ixp4xx/common-pci.c:121:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int ixp4xx_pci_read_no_errata(u32 addr, u32 cmd, u32* data)
^
static
>> arch/arm/mach-ixp4xx/common-pci.c:143:5: warning: no previous prototype for function 'ixp4xx_pci_write' [-Wmissing-prototypes]
int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
^
arch/arm/mach-ixp4xx/common-pci.c:143:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
^
static
3 warnings generated.


vim +/ixp4xx_pci_write +143 arch/arm/mach-ixp4xx/common-pci.c

^1da177e4c3f41 Linus Torvalds 2005-04-16 142
^1da177e4c3f41 Linus Torvalds 2005-04-16 @143 int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
^1da177e4c3f41 Linus Torvalds 2005-04-16 144 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 145 unsigned long flags;
^1da177e4c3f41 Linus Torvalds 2005-04-16 146 int retval = 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 147
bd31b85960a7fc Thomas Gleixner 2009-07-03 148 raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
^1da177e4c3f41 Linus Torvalds 2005-04-16 149
^1da177e4c3f41 Linus Torvalds 2005-04-16 150 *PCI_NP_AD = addr;
^1da177e4c3f41 Linus Torvalds 2005-04-16 151
^1da177e4c3f41 Linus Torvalds 2005-04-16 152 /* set up the write */
^1da177e4c3f41 Linus Torvalds 2005-04-16 153 *PCI_NP_CBE = cmd;
^1da177e4c3f41 Linus Torvalds 2005-04-16 154
^1da177e4c3f41 Linus Torvalds 2005-04-16 155 /* execute the write by writing to NP_WDATA */
^1da177e4c3f41 Linus Torvalds 2005-04-16 156 *PCI_NP_WDATA = data;
^1da177e4c3f41 Linus Torvalds 2005-04-16 157
^1da177e4c3f41 Linus Torvalds 2005-04-16 158 if(check_master_abort())
^1da177e4c3f41 Linus Torvalds 2005-04-16 159 retval = 1;
^1da177e4c3f41 Linus Torvalds 2005-04-16 160
bd31b85960a7fc Thomas Gleixner 2009-07-03 161 raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
^1da177e4c3f41 Linus Torvalds 2005-04-16 162 return retval;
^1da177e4c3f41 Linus Torvalds 2005-04-16 163 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 164

:::::: The code at line 143 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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