linux-kernel - Re: [PATCH v3 2/3] selftests/resctrl: Simplify cleanup in ctrl-c handler

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Message-ID: <qxn5tpm3gkv7l32rbcjapik6mn7uzmv24zw7hyrvp55mngyufb@3fgphjebxkvb>
Date: Mon, 26 Feb 2024 10:43:35 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: Reinette Chatre <reinette.chatre@...el.com>
CC: Fenghua Yu <fenghua.yu@...el.com>, Shuah Khan <shuah@...nel.org>,
	<ilpo.jarvinen@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] selftests/resctrl: Simplify cleanup in ctrl-c
 handler

On 2024-02-23 at 13:18:22 -0800, Reinette Chatre wrote:
>Hi Maciej,
>
>On 2/22/2024 4:07 AM, Maciej Wieczor-Retman wrote:
>  	}
>> diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
>> index 5a49f07a6c85..0134aa2f896a 100644
>> --- a/tools/testing/selftests/resctrl/resctrl_val.c
>> +++ b/tools/testing/selftests/resctrl/resctrl_val.c
>> @@ -62,6 +62,7 @@ struct imc_counter_config {
>>  static char mbm_total_path[1024];
>>  static int imcs;
>>  static struct imc_counter_config imc_counters_config[MAX_IMCS][2];
>> +static const struct resctrl_test *current_test;
>>  
>>  void membw_initialize_perf_event_attr(int i, int j)
>>  {
>> @@ -472,7 +473,8 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
>>  	if (bm_pid)
>>  		kill(bm_pid, SIGKILL);
>>  	umount_resctrlfs();
>> -	tests_cleanup();
>> +	if (current_test->cleanup)
>> +		current_test->cleanup();
>
>Could you please make this more robust with a:
>
>	if (current_test && current_test->cleanup)

Okay, will do.

>
>>  	ksft_print_msg("Ending\n\n");
>>  
>>  	exit(EXIT_SUCCESS);
>> @@ -482,13 +484,14 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr)
>>   * Register CTRL-C handler for parent, as it has to kill
>>   * child process before exiting.
>>   */
>> -int signal_handler_register(void)
>> +int signal_handler_register(const struct resctrl_test *test)
>>  {
>>  	struct sigaction sigact = {};
>>  	int ret = 0;
>>  
>>  	bm_pid = 0;
>>  
>> +	current_test = test;
>>  	sigact.sa_sigaction = ctrlc_handler;
>>  	sigemptyset(&sigact.sa_mask);
>>  	sigact.sa_flags = SA_SIGINFO;
>
>Could you please reset the pointer in signal_handler_unregister()?

Okay, I'll set it to NULL here.

>
>Reinette

-- 
Kind regards
Maciej Wieczór-Retman