kernel test robot <lkp@xxxxxxxxx> writes: > 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: > ^~~~ I guess there's a missing /* fallthrough */ tag for this case - not sure why it flagged on this particular commit. Doesn't look related. > 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
