linux-kernel - Re: [PATCH 1/2] tracing: Fix cpu buffers unavailable due to 'record

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Date:   Sat, 5 Aug 2023 09:56:28 +0800
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     kernel test robot <lkp@...el.com>, <rostedt@...dmis.org>,
        <mhiramat@...nel.org>, <vnagarnaik@...gle.com>, <shuah@...nel.org>
CC:     <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 1/2] tracing: Fix cpu buffers unavailable due to
 'record_disabled' messed

On 2023/8/5 09:15, kernel test robot wrote:
> Hi Zheng,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on linus/master]
> [also build test ERROR on rostedt-trace/for-next v6.5-rc4 next-20230804]
> [cannot apply to rostedt-trace/for-next-urgent]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Zheng-Yejian/tracing-Fix-cpu-buffers-unavailable-due-to-record_disabled-messed/20230804-204751
> base:   linus/master
> patch link:    https://lore.kernel.org/r/20230804124549.2562977-2-zhengyejian1%40huawei.com
> patch subject: [PATCH 1/2] tracing: Fix cpu buffers unavailable due to 'record_disabled' messed
> config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20230805/202308050731.PQutr3r0-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce: (https://download.01.org/0day-ci/archive/20230805/202308050731.PQutr3r0-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308050731.PQutr3r0-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>     kernel/trace/trace.c: In function 'tracing_set_cpumask':
>>> kernel/trace/trace.c:5280:60: error: 'struct trace_array' has no member named 'max_buffer'; did you mean 'array_buffer'?
>      5280 |                         ring_buffer_record_disable_cpu(tr->max_buffer.buffer, cpu);
>           |                                                            ^~~~~~~~~~
>           |                                                            array_buffer
>     kernel/trace/trace.c:5286:59: error: 'struct trace_array' has no member named 'max_buffer'; did you mean 'array_buffer'?
>      5286 |                         ring_buffer_record_enable_cpu(tr->max_buffer.buffer, cpu);
>           |                                                           ^~~~~~~~~~
>           |                                                           array_buffer
> 

Thank you, robot!
I'll fix it in v2 soon.

> 
> vim +5280 kernel/trace/trace.c
> 
>    5260	
>    5261	int tracing_set_cpumask(struct trace_array *tr,
>    5262				cpumask_var_t tracing_cpumask_new)
>    5263	{
>    5264		int cpu;
>    5265	
>    5266		if (!tr)
>    5267			return -EINVAL;
>    5268	
>    5269		local_irq_disable();
>    5270		arch_spin_lock(&tr->max_lock);
>    5271		for_each_tracing_cpu(cpu) {
>    5272			/*
>    5273			 * Increase/decrease the disabled counter if we are
>    5274			 * about to flip a bit in the cpumask:
>    5275			 */
>    5276			if (cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
>    5277					!cpumask_test_cpu(cpu, tracing_cpumask_new)) {
>    5278				atomic_inc(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled);
>    5279				ring_buffer_record_disable_cpu(tr->array_buffer.buffer, cpu);
>> 5280				ring_buffer_record_disable_cpu(tr->max_buffer.buffer, cpu);
>    5281			}
>    5282			if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) &&
>    5283					cpumask_test_cpu(cpu, tracing_cpumask_new)) {
>    5284				atomic_dec(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled);
>    5285				ring_buffer_record_enable_cpu(tr->array_buffer.buffer, cpu);
>    5286				ring_buffer_record_enable_cpu(tr->max_buffer.buffer, cpu);
>    5287			}
>    5288		}
>    5289		arch_spin_unlock(&tr->max_lock);
>    5290		local_irq_enable();
>    5291	
>    5292		cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new);
>    5293	
>    5294		return 0;
>    5295	}
>    5296	
>