[rcu:dev.2020.06.02a 67/90] kernel/rcu/rcuperf.c:727:38: warning: format specifies type 'size_t' (aka 'unsigned int') but the argument has type 'unsigned long'

From: kernel test robot
Date: Fri Jun 05 2020 - 19:21:36 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.06.02a
head: 5216948905dd07a84cef8a7dc72c2ec076802efd
commit: 7d16add62717136b1839f0b3d7ea4cbb98f38c2a [67/90] rcuperf: Fix kfree_mult to match printk() format
config: arm-randconfig-r004-20200605 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 6dd738e2f0609f7d3313b574a1d471263d2d3ba1)
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
git checkout 7d16add62717136b1839f0b3d7ea4cbb98f38c2a
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm

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 <<):

>> kernel/rcu/rcuperf.c:727:38: warning: format specifies type 'size_t' (aka 'unsigned int') but the argument has type 'unsigned long' [-Wformat]
pr_alert("kfree object size=%zun", kfree_mult * sizeof(struct kfree_obj));
~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
%lu
include/linux/printk.h:295:35: note: expanded from macro 'pr_alert'
printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
~~~ ^~~~~~~~~~~
1 warning generated.

vim +727 kernel/rcu/rcuperf.c

e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 709)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 710) static int __init
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 711) kfree_perf_init(void)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 712) {
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 713) long i;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 714) int firsterr = 0;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 715)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 716) kfree_nrealthreads = compute_real(kfree_nthreads);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 717) /* Start up the kthreads. */
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 718) if (shutdown) {
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 719) init_waitqueue_head(&shutdown_wq);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 720) firsterr = torture_create_kthread(kfree_perf_shutdown, NULL,
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 721) shutdown_task);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 722) if (firsterr)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 723) goto unwind;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 724) schedule_timeout_uninterruptible(1);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 725) }
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 726)
b3e2d20973db3e Kefeng Wang 2020-04-17 @727 pr_alert("kfree object size=%zu\n", kfree_mult * sizeof(struct kfree_obj));
f87dc808009ac8 Joel Fernandes (Google 2020-03-16 728)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 729) kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 730) GFP_KERNEL);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 731) if (kfree_reader_tasks == NULL) {
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 732) firsterr = -ENOMEM;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 733) goto unwind;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 734) }
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 735)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 736) for (i = 0; i < kfree_nrealthreads; i++) {
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 737) firsterr = torture_create_kthread(kfree_perf_thread, (void *)i,
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 738) kfree_reader_tasks[i]);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 739) if (firsterr)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 740) goto unwind;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 741) }
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 742)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 743) while (atomic_read(&n_kfree_perf_thread_started) < kfree_nrealthreads)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 744) schedule_timeout_uninterruptible(1);
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 745)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 746) torture_init_end();
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 747) return 0;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 748)
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 749) unwind:
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 750) torture_init_end();
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 751) kfree_perf_cleanup();
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 752) return firsterr;
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 753) }
e6e78b004fa7e0 Joel Fernandes (Google 2019-08-30 754)

:::::: The code at line 727 was first introduced by commit
:::::: b3e2d20973db3ec87a6dd2fee0c88d3c2e7c2f61 rcuperf: Fix printk format warning

:::::: TO: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
:::::: CC: Paul E. McKenney <paulmck@xxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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