linux-kernel - Re: [PATCH v4 1/1] xen/time: do not decrease steal time after live migration on xen

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Message-ID: <201711020750.4wfLfqpv%fengguang.wu@intel.com>
Date:   Thu, 2 Nov 2017 07:35:18 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dongli Zhang <dongli.zhang@...cle.com>
Cc:     kbuild-all@...org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, joao.m.martins@...cle.com
Subject: Re: [PATCH v4 1/1] xen/time: do not decrease steal time after live
 migration on xen

Hi Dongli,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.14-rc7 next-20171018]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dongli-Zhang/xen-time-do-not-decrease-steal-time-after-live-migration-on-xen/20171102-025719
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: arm64-allmodconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm64 

All errors (new ones prefixed by >>):

   drivers/xen/time.c: In function 'xen_accumulate_runstate_time':
   drivers/xen/time.c:92:25: error: implicit declaration of function 'kcalloc' [-Werror=implicit-function-declaration]
      runstate_time_delta = kcalloc(num_possible_cpus(),
                            ^~~~~~~
   drivers/xen/time.c:92:23: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      runstate_time_delta = kcalloc(num_possible_cpus(),
                          ^
>> drivers/xen/time.c:102:31: error: implicit declaration of function 'kmalloc_array' [-Werror=implicit-function-declaration]
       runstate_time_delta[cpu] = kmalloc_array(RUNSTATE_max,
                                  ^~~~~~~~~~~~~
   drivers/xen/time.c:102:29: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
       runstate_time_delta[cpu] = kmalloc_array(RUNSTATE_max,
                                ^
   drivers/xen/time.c:141:5: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration]
        kfree(runstate_time_delta[cpu]);
        ^~~~~
   cc1: some warnings being treated as errors

vim +/kmalloc_array +102 drivers/xen/time.c

    82	
    83	void xen_accumulate_runstate_time(int action)
    84	{
    85		struct vcpu_runstate_info state;
    86		int cpu, i;
    87	
    88		switch (action) {
    89		case -1: /* backup runstate time before suspend */
    90			WARN_ON_ONCE(unlikely(runstate_time_delta));
    91	
  > 92			runstate_time_delta = kcalloc(num_possible_cpus(),
    93							  sizeof(*runstate_time_delta),
    94							  GFP_KERNEL);
    95			if (unlikely(!runstate_time_delta)) {
    96				pr_alert("%s: failed to allocate runstate_time_delta\n",
    97						__func__);
    98				return;
    99			}
   100	
   101			for_each_possible_cpu(cpu) {
 > 102				runstate_time_delta[cpu] = kmalloc_array(RUNSTATE_max,
   103							  sizeof(**runstate_time_delta),
   104							  GFP_KERNEL);
   105				if (unlikely(!runstate_time_delta[cpu])) {
   106					pr_alert("%s: failed to allocate runstate_time_delta[%d]\n",
   107							__func__, cpu);
   108					action = 0;
   109					goto reclaim_mem;
   110				}
   111	
   112				xen_get_runstate_snapshot_cpu_delta(&state, cpu);
   113				memcpy(runstate_time_delta[cpu],
   114					state.time,
   115					RUNSTATE_max * sizeof(**runstate_time_delta));
   116			}
   117			break;
   118	
   119		case 0: /* backup runstate time after resume */
   120			if (unlikely(!runstate_time_delta)) {
   121				pr_alert("%s: cannot accumulate runstate time as runstate_time_delta is NULL\n",
   122						__func__);
   123				return;
   124			}
   125	
   126			for_each_possible_cpu(cpu) {
   127				for (i = 0; i < RUNSTATE_max; i++)
   128					per_cpu(old_runstate_time, cpu)[i] +=
   129							runstate_time_delta[cpu][i];
   130			}
   131			break;
   132	
   133		default: /* do not accumulate runstate time for checkpointing */
   134			break;
   135		}
   136	
   137	reclaim_mem:
   138		if (action != -1 && runstate_time_delta) {
   139			for_each_possible_cpu(cpu) {
   140				if (likely(runstate_time_delta[cpu]))
   141					kfree(runstate_time_delta[cpu]);
   142			}
   143			kfree(runstate_time_delta);
   144			runstate_time_delta = NULL;
   145		}
   146	}
   147	

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