tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: c11d28ab4a691736e30b49813fb801847bd44e83 commit: f87dc808009ac86c790031627698ef1a34c31e25 [4045/12102] rcuperf: Add ability to increase object allocation size config: i386-debian-10.3 (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce (this is a W=1 build): git checkout f87dc808009ac86c790031627698ef1a34c31e25 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/printk.h:7:0, from include/linux/kernel.h:15, from kernel/rcu/rcuperf.c:13: kernel/rcu/rcuperf.c: In function 'kfree_perf_init': include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'unsigned int' [-Wformat=] #define KERN_SOH "001" /* ASCII Start Of Header */ ^ include/linux/kern_levels.h:9:20: note: in expansion of macro 'KERN_SOH' #define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */ ^~~~~~~~ printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~~ kernel/rcu/rcuperf.c:726:2: note: in expansion of macro 'pr_alert' pr_alert("kfree object size=%lun", kfree_mult * sizeof(struct kfree_obj)); ^~~~~~~~ kernel/rcu/rcuperf.c:726:32: note: format string is defined here pr_alert("kfree object size=%lun", kfree_mult * sizeof(struct kfree_obj)); ~~^ %u vim +/KERN_ALERT +295 include/linux/printk.h 968ab1838a5d48 Linus Torvalds 2010-11-15 285 6e099f557d9c67 Dan Streetman 2014-06-04 286 /* 6e099f557d9c67 Dan Streetman 2014-06-04 287 * These can be used to print at the various log levels. 6e099f557d9c67 Dan Streetman 2014-06-04 288 * All of these will print unconditionally, although note that pr_debug() 6e099f557d9c67 Dan Streetman 2014-06-04 289 * and other debug macros are compiled out unless either DEBUG is defined 6e099f557d9c67 Dan Streetman 2014-06-04 290 * or CONFIG_DYNAMIC_DEBUG is set. 6e099f557d9c67 Dan Streetman 2014-06-04 291 */ a0cba2179ea4c1 Linus Torvalds 2016-08-09 292 #define pr_emerg(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 293 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__) a0cba2179ea4c1 Linus Torvalds 2016-08-09 294 #define pr_alert(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 @295 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__) a0cba2179ea4c1 Linus Torvalds 2016-08-09 296 #define pr_crit(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 297 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) a0cba2179ea4c1 Linus Torvalds 2016-08-09 298 #define pr_err(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 299 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) 61ff72f4016804 Kefeng Wang 2019-11-28 300 #define pr_warn(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 301 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) a0cba2179ea4c1 Linus Torvalds 2016-08-09 302 #define pr_notice(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 303 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__) a0cba2179ea4c1 Linus Torvalds 2016-08-09 304 #define pr_info(fmt, ...) \ a0cba2179ea4c1 Linus Torvalds 2016-08-09 305 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 7b1460eccad062 Steven Rostedt 2015-04-15 306 /* 7b1460eccad062 Steven Rostedt 2015-04-15 307 * Like KERN_CONT, pr_cont() should only be used when continuing 7b1460eccad062 Steven Rostedt 2015-04-15 308 * a line with no newline ('\n') enclosed. Otherwise it defaults 7b1460eccad062 Steven Rostedt 2015-04-15 309 * back to KERN_DEFAULT. 7b1460eccad062 Steven Rostedt 2015-04-15 310 */ 968ab1838a5d48 Linus Torvalds 2010-11-15 311 #define pr_cont(fmt, ...) \ 968ab1838a5d48 Linus Torvalds 2010-11-15 312 printk(KERN_CONT fmt, ##__VA_ARGS__) 968ab1838a5d48 Linus Torvalds 2010-11-15 313 :::::: The code at line 295 was first introduced by commit :::::: a0cba2179ea4c1820fce2ee046b6ed90ecc56196 Revert "printk: create pr_<level> functions" :::::: TO: Linus Torvalds <torvalds(a)linux-foundation.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org