Hi Jindong,

FYI, the error/warning still remains.

tree:   https://github.com/Freescale/linux-fslc pr/616
head:   6c043104035260bc3128a7b8480559bc86f834f0
commit: e1ab8f0dce3e08b5ec37419160bfc04ef4f438e1 [9878/18686] MA-19046 clk: imx8mm: Support building clk-imx8mm driver as module
config: powerpc-randconfig-r033-20221207
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/Freescale/linux-fslc/commit/e1ab8f0dce3e08b5ec37419160bfc04ef4f438e1
        git remote add freescale-fslc https://github.com/Freescale/linux-fslc
        git fetch --no-tags freescale-fslc pr/616
        git checkout e1ab8f0dce3e08b5ec37419160bfc04ef4f438e1
        # 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=powerpc SHELL=/bin/bash drivers/clk/imx/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:43:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:35:1: note: expanded from here
   __do_insb
   ^
   arch/powerpc/include/asm/io.h:556:56: note: expanded from macro '__do_insb'
   #define __do_insb(p, b, n)      readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
                                          ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:37:1: note: expanded from here
   __do_insw
   ^
   arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw'
   #define __do_insw(p, b, n)      readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
                                          ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:39:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl'
   #define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
                                          ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:41:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb'
   #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:43:1: note: expanded from here
   __do_outsw
   ^
   arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw'
   #define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/clk/imx/clk-imx8mm.c:11:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:45:1: note: expanded from here
   __do_outsl
   ^
   arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
   #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
>> drivers/clk/imx/clk-imx8mm.c:710:26: warning: unused variable 'delta_k_fops' [-Wunused-const-variable]
   DEFINE_DEBUGFS_ATTRIBUTE(delta_k_fops, NULL, pll_delta_k_set, "%lld\n");
                            ^
>> drivers/clk/imx/clk-imx8mm.c:731:1: warning: unused variable 'pll_setting_fops' [-Wunused-const-variable]
   DEFINE_SHOW_ATTRIBUTE(pll_setting);
   ^
   include/linux/seq_file.h:186:37: note: expanded from macro 'DEFINE_SHOW_ATTRIBUTE'
   static const struct file_operations __name ## _fops = {                 \
                                       ^
   <scratch space>:416:1: note: expanded from here
   pll_setting_fops
   ^
   8 warnings generated.


vim +/delta_k_fops +710 drivers/clk/imx/clk-imx8mm.c

85a61310c03536 Jacky Bai 2020-04-07  696  
85a61310c03536 Jacky Bai 2020-04-07  697  static int pll_delta_k_set(void *data, u64 val)
85a61310c03536 Jacky Bai 2020-04-07  698  {
85a61310c03536 Jacky Bai 2020-04-07  699  	struct clk_hw *hw;
85a61310c03536 Jacky Bai 2020-04-07  700  	short int delta_k;
85a61310c03536 Jacky Bai 2020-04-07  701  
85a61310c03536 Jacky Bai 2020-04-07  702  	hw = data;
85a61310c03536 Jacky Bai 2020-04-07  703  	delta_k = (short int) (val & KDIV_MASK);
85a61310c03536 Jacky Bai 2020-04-07  704  
85a61310c03536 Jacky Bai 2020-04-07  705  	clk_set_delta_k(hw, val);
85a61310c03536 Jacky Bai 2020-04-07  706  
85a61310c03536 Jacky Bai 2020-04-07  707  	pr_debug("the delta k is %d\n", delta_k);
85a61310c03536 Jacky Bai 2020-04-07  708  	return 0;
85a61310c03536 Jacky Bai 2020-04-07  709  }
85a61310c03536 Jacky Bai 2020-04-07 @710  DEFINE_DEBUGFS_ATTRIBUTE(delta_k_fops, NULL, pll_delta_k_set, "%lld\n");
85a61310c03536 Jacky Bai 2020-04-07  711  
85a61310c03536 Jacky Bai 2020-04-07  712  static int pll_setting_show(struct seq_file *s, void *data)
85a61310c03536 Jacky Bai 2020-04-07  713  {
85a61310c03536 Jacky Bai 2020-04-07  714  	struct clk_hw *hw;
85a61310c03536 Jacky Bai 2020-04-07  715  	u32 pll_div_ctrl0, pll_div_ctrl1;
85a61310c03536 Jacky Bai 2020-04-07  716  	u32 mdiv, pdiv, sdiv, kdiv;
85a61310c03536 Jacky Bai 2020-04-07  717  
85a61310c03536 Jacky Bai 2020-04-07  718  	hw = s->private;;
85a61310c03536 Jacky Bai 2020-04-07  719  
85a61310c03536 Jacky Bai 2020-04-07  720  	clk_get_pll_setting(hw, &pll_div_ctrl0, &pll_div_ctrl1);
85a61310c03536 Jacky Bai 2020-04-07  721  	mdiv = (pll_div_ctrl0 & MDIV_MASK) >> MDIV_SHIFT;
85a61310c03536 Jacky Bai 2020-04-07  722  	pdiv = (pll_div_ctrl0 & PDIV_MASK) >> PDIV_SHIFT;
85a61310c03536 Jacky Bai 2020-04-07  723  	sdiv = (pll_div_ctrl0 & SDIV_MASK) >> SDIV_SHIFT;
85a61310c03536 Jacky Bai 2020-04-07  724  	kdiv = (pll_div_ctrl1 & KDIV_MASK);
85a61310c03536 Jacky Bai 2020-04-07  725  
85a61310c03536 Jacky Bai 2020-04-07  726  	seq_printf(s, "Mdiv: 0x%x; Pdiv: 0x%x; Sdiv: 0x%x; Kdiv: 0x%x\n",
85a61310c03536 Jacky Bai 2020-04-07  727  		mdiv, pdiv, sdiv, kdiv);
85a61310c03536 Jacky Bai 2020-04-07  728  
85a61310c03536 Jacky Bai 2020-04-07  729  	return 0;
85a61310c03536 Jacky Bai 2020-04-07  730  }
85a61310c03536 Jacky Bai 2020-04-07 @731  DEFINE_SHOW_ATTRIBUTE(pll_setting);
85a61310c03536 Jacky Bai 2020-04-07  732  

:::::: The code at line 710 was first introduced by commit
:::::: 85a61310c03536f1da881cc423ae83dce540ddad MLK-23751 clk: imx: Add audio PLL debug fs for K-divider monitor control

:::::: TO: Jacky Bai <ping.bai@nxp.com>
:::::: CC: Dong Aisheng <aisheng.dong@nxp.com>

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