Re: [PATCH 2/2] PCI: rcar: Return all Fs from read which triggered an exception

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Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on helgaas-pci/next]
[also build test WARNING on next-20220116]
[cannot apply to v5.16]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/marek-vasut-gmail-com/PCI-rcar-Finish-transition-to-L1-state-in-rcar_pcie_config_access/20220116-102631
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: arm-randconfig-c002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201170230.U9LeY58M-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54)
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://github.com/0day-ci/linux/commit/f784bebf4a058d633fc77579892309b12dd33edb
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review marek-vasut-gmail-com/PCI-rcar-Finish-transition-to-L1-state-in-rcar_pcie_config_access/20220116-102631
        git checkout f784bebf4a058d633fc77579892309b12dd33edb
        # 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 drivers/pci/controller/

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

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/pcie-rcar-host.c:109:6: warning: no previous prototype for function 'rcar_pci_write_reg_workaround' [-Wmissing-prototypes]
   void rcar_pci_write_reg_workaround(struct rcar_pcie *pcie, u32 val, unsigned int reg)
        ^
   drivers/pci/controller/pcie-rcar-host.c:109:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void rcar_pci_write_reg_workaround(struct rcar_pcie *pcie, u32 val, unsigned int reg)
   ^
   static 
>> drivers/pci/controller/pcie-rcar-host.c:121:5: warning: no previous prototype for function 'rcar_pci_read_reg_workaround' [-Wmissing-prototypes]
   u32 rcar_pci_read_reg_workaround(struct rcar_pcie *pcie, unsigned int reg)
       ^
   drivers/pci/controller/pcie-rcar-host.c:121:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u32 rcar_pci_read_reg_workaround(struct rcar_pcie *pcie, unsigned int reg)
   ^
   static 
   drivers/pci/controller/pcie-rcar-host.c:114:4: error: instruction requires: data-barriers
                   "       isb\n"
                    ^
   <inline asm>:2:2: note: instantiated into assembly here
           isb
           ^
   drivers/pci/controller/pcie-rcar-host.c:129:4: error: instruction requires: data-barriers
                   "       isb\n"
                    ^
   <inline asm>:3:2: note: instantiated into assembly here
           isb
           ^
   drivers/pci/controller/pcie-rcar-host.c:114:4: error: instruction requires: data-barriers
                   "       isb\n"
                    ^
   <inline asm>:2:2: note: instantiated into assembly here
           isb
           ^
   drivers/pci/controller/pcie-rcar-host.c:127:3: error: symbol 'rcar_pci_read_reg_workaround_start' is already defined
                   "rcar_pci_read_reg_workaround_start:\n"
                   ^
   <inline asm>:1:2: note: instantiated into assembly here
           rcar_pci_read_reg_workaround_start:
           ^
   drivers/pci/controller/pcie-rcar-host.c:129:4: error: instruction requires: data-barriers
                   "       isb\n"
                    ^
   <inline asm>:3:2: note: instantiated into assembly here
           isb
           ^
   2 warnings and 5 errors generated.


vim +/rcar_pci_write_reg_workaround +109 drivers/pci/controller/pcie-rcar-host.c

   108	
 > 109	void rcar_pci_write_reg_workaround(struct rcar_pcie *pcie, u32 val, unsigned int reg)
   110	{
   111	#ifdef CONFIG_ARM
   112		asm volatile(
   113			"	str %0, [%1]\n"
   114			"	isb\n"
   115		::"r"(val), "r"(pcie->base + reg):"memory");
   116	#else
   117		rcar_pci_write_reg(pcie, val, reg);
   118	#endif
   119	}
   120	
 > 121	u32 rcar_pci_read_reg_workaround(struct rcar_pcie *pcie, unsigned int reg)
   122	{
   123	#ifdef CONFIG_ARM
   124		u32 val;
   125	
   126		asm volatile(
   127			"rcar_pci_read_reg_workaround_start:\n"
   128			"1:	ldr %0, [%1]\n"
   129			"	isb\n"
   130		: "=r"(val):"r"(pcie->base + reg):"memory");
   131	
   132		return val;
   133	#else
   134		return rcar_pci_read_reg(pcie, reg);
   135	#endif
   136	}
   137	

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



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