linux-kernel - arch/arm/mm/proc-v7-bugs.c:111:15: warning: more '%' conversions than data arguments

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Date:   Thu, 10 Mar 2022 16:34:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: arch/arm/mm/proc-v7-bugs.c:111:15: warning: more '%' conversions
 than data arguments

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3bf7edc84a9eb4007dd9a0cb8878a7e1d5ec6a3b
commit: 9dd78194a3722fa6712192cdd4f7032d45112a9a ARM: report Spectre v2 status through sysfs
date:   5 days ago
config: arm-randconfig-r035-20220310 (https://download.01.org/0day-ci/archive/20220310/202203101629.dia0kbU5-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 276ca87382b8f16a65bddac700202924228982f6)
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=9dd78194a3722fa6712192cdd4f7032d45112a9a
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 9dd78194a3722fa6712192cdd4f7032d45112a9a
        # 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 arch/arm/mm/

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

All warnings (new ones prefixed by >>):

>> arch/arm/mm/proc-v7-bugs.c:111:15: warning: more '%' conversions than data arguments [-Wformat-insufficient-args]
           pr_info("CPU%u: Spectre V2: workarounds disabled by configuration\n");
                       ~^
   include/linux/printk.h:523:26: note: expanded from macro 'pr_info'
           printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
                                   ^~~
   include/linux/printk.h:340:21: note: expanded from macro 'pr_fmt'
   #define pr_fmt(fmt) fmt
                       ^~~
   include/linux/printk.h:450:53: note: expanded from macro 'printk'
   #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
                                                       ^~~
   include/linux/printk.h:422:11: note: expanded from macro 'printk_index_wrap'
                   _p_func(_fmt, ##__VA_ARGS__);                           \
                           ^~~~
   arch/arm/mm/proc-v7-bugs.c:205:6: warning: no previous prototype for function 'cpu_v7_ca8_ibe' [-Wmissing-prototypes]
   void cpu_v7_ca8_ibe(void)
        ^
   arch/arm/mm/proc-v7-bugs.c:205:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cpu_v7_ca8_ibe(void)
   ^
   static 
   arch/arm/mm/proc-v7-bugs.c:211:6: warning: no previous prototype for function 'cpu_v7_ca15_ibe' [-Wmissing-prototypes]
   void cpu_v7_ca15_ibe(void)
        ^
   arch/arm/mm/proc-v7-bugs.c:211:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cpu_v7_ca15_ibe(void)
   ^
   static 
   arch/arm/mm/proc-v7-bugs.c:217:6: warning: no previous prototype for function 'cpu_v7_bugs_init' [-Wmissing-prototypes]
   void cpu_v7_bugs_init(void)
        ^
   arch/arm/mm/proc-v7-bugs.c:217:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cpu_v7_bugs_init(void)
   ^
   static 
   4 warnings generated.


vim +111 arch/arm/mm/proc-v7-bugs.c

    65	
    66	static unsigned int spectre_v2_install_workaround(unsigned int method)
    67	{
    68		const char *spectre_v2_method = NULL;
    69		int cpu = smp_processor_id();
    70	
    71		if (per_cpu(harden_branch_predictor_fn, cpu))
    72			return SPECTRE_MITIGATED;
    73	
    74		switch (method) {
    75		case SPECTRE_V2_METHOD_BPIALL:
    76			per_cpu(harden_branch_predictor_fn, cpu) =
    77				harden_branch_predictor_bpiall;
    78			spectre_v2_method = "BPIALL";
    79			break;
    80	
    81		case SPECTRE_V2_METHOD_ICIALLU:
    82			per_cpu(harden_branch_predictor_fn, cpu) =
    83				harden_branch_predictor_iciallu;
    84			spectre_v2_method = "ICIALLU";
    85			break;
    86	
    87		case SPECTRE_V2_METHOD_HVC:
    88			per_cpu(harden_branch_predictor_fn, cpu) =
    89				call_hvc_arch_workaround_1;
    90			cpu_do_switch_mm = cpu_v7_hvc_switch_mm;
    91			spectre_v2_method = "hypervisor";
    92			break;
    93	
    94		case SPECTRE_V2_METHOD_SMC:
    95			per_cpu(harden_branch_predictor_fn, cpu) =
    96				call_smc_arch_workaround_1;
    97			cpu_do_switch_mm = cpu_v7_smc_switch_mm;
    98			spectre_v2_method = "firmware";
    99			break;
   100		}
   101	
   102		if (spectre_v2_method)
   103			pr_info("CPU%u: Spectre v2: using %s workaround\n",
   104				smp_processor_id(), spectre_v2_method);
   105	
   106		return SPECTRE_MITIGATED;
   107	}
   108	#else
   109	static unsigned int spectre_v2_install_workaround(unsigned int method)
   110	{
 > 111		pr_info("CPU%u: Spectre V2: workarounds disabled by configuration\n");
   112	
   113		return SPECTRE_VULNERABLE;
   114	}
   115	#endif
   116	

---
0-DAY CI Kernel Test Service, Intel Corporation
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