Re: [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: Paul E. McKenney
Date: Fri Jun 05 2020 - 20:24:11 EST
On Sat, Jun 06, 2020 at 07:07:10AM +0800, kernel test robot wrote:
> 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>
Adding Kefeng on CC. Kefeng, thoughts?
Thanx, Paul
> 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