tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y head: bb07acdd9271518022b632253e857f43c09fb147 commit: b60b53d4980f879884740e672d83155980d74445 [9981/9999] printk: help pr_debug and pr_devel to optimize out arguments config: i386-randconfig-s001-20200605 (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # apt-get install sparse # sparse version: v0.6.1-246-g41f651b4-dirty git checkout b60b53d4980f879884740e672d83155980d74445 # save the attached .config to linux build tree make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/ioport.h:12:0, from include/linux/device.h:16, from include/linux/platform_device.h:14, from arch/x86/kernel/cpu/microcode/core.c:24: arch/x86/kernel/cpu/microcode/core.c: In function 'mc_cpu_callback': include/linux/compiler.h:163:5: warning: this statement may fall through [-Wimplicit-fallthrough=] if (__builtin_constant_p(!!(cond)) ? !!(cond) : ^ include/linux/compiler.h:161:23: note: in expansion of macro '__trace_if' #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) ) ^~~~~~~~~~ >> include/linux/printk.h:113:2: note: in expansion of macro 'if' if (0) ^~ include/linux/printk.h:289:2: note: in expansion of macro 'no_printk' no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~ arch/x86/kernel/cpu/microcode/core.c:599:3: note: in expansion of macro 'pr_debug' pr_debug("CPU%d addedn", cpu); ^~~~~~~~ arch/x86/kernel/cpu/microcode/core.c:605:2: note: here case CPU_DOWN_FAILED: ^~~~ vim +/if +113 include/linux/printk.h 106 107 /* 108 * Dummy printk for disabled debugging statements to use whilst maintaining 109 * gcc's format checking. 110 */ 111 #define no_printk(fmt, ...) \ 112 do { \ > 113 if (0) \ 114 printk(fmt, ##__VA_ARGS__); \ 115 } while (0) 116 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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