[linux-stable-rc:linux-4.4.y 9981/9999] include/linux/printk.h:113:2: note: in expansion of macro 'if'

[kernel test robot <lkp@intel.com>]

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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@intel.com>

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@lists.01.org

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