linux-kernel - Re: [PATCH 1/2] selftests/watchdog: limit ping loop and allow configuring the number of pings

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Date: Thu, 27 Jun 2024 12:48:28 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Laura Nao <laura.nao@...labora.com>, shuah@...nel.org
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH 1/2] selftests/watchdog: limit ping loop and allow
 configuring the number of pings

On 5/6/24 05:13, Laura Nao wrote:
> In order to run the watchdog selftest with the kselftest runner, the
> loop responsible for pinging the watchdog should be finite. This
> change limits the loop to 5 iterations by default and introduces a new
> '-c' option to adjust the number of pings as needed.

This patch makes the test run finite in all cases changing the bevavior
to run it forever?
> 
> Signed-off-by: Laura Nao <laura.nao@...labora.com>
> ---
>   tools/testing/selftests/watchdog/watchdog-test.c | 16 ++++++++++++++--
>   1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
> index bc71cbca0dde..786cc5a26206 100644
> --- a/tools/testing/selftests/watchdog/watchdog-test.c
> +++ b/tools/testing/selftests/watchdog/watchdog-test.c
> @@ -24,16 +24,18 @@
>   #include <linux/watchdog.h>
>   
>   #define DEFAULT_PING_RATE	1
> +#define DEFAULT_PING_COUNT	5
>   
>   int fd;
>   const char v = 'V';
> -static const char sopts[] = "bdehp:st:Tn:NLf:i";
> +static const char sopts[] = "bdehp:c:st:Tn:NLf:i";
>   static const struct option lopts[] = {
>   	{"bootstatus",          no_argument, NULL, 'b'},
>   	{"disable",             no_argument, NULL, 'd'},
>   	{"enable",              no_argument, NULL, 'e'},
>   	{"help",                no_argument, NULL, 'h'},
>   	{"pingrate",      required_argument, NULL, 'p'},
> +	{"pingcount",     required_argument, NULL, 'c'},
>   	{"status",              no_argument, NULL, 's'},
>   	{"timeout",       required_argument, NULL, 't'},
>   	{"gettimeout",          no_argument, NULL, 'T'},
> @@ -90,6 +92,8 @@ static void usage(char *progname)
>   	printf(" -h, --help\t\tPrint the help message\n");
>   	printf(" -p, --pingrate=P\tSet ping rate to P seconds (default %d)\n",
>   	       DEFAULT_PING_RATE);
> +	printf(" -c, --pingcount=C\tSet number of pings to C (default %d)\n",
> +	       DEFAULT_PING_COUNT);
>   	printf(" -t, --timeout=T\tSet timeout to T seconds\n");
>   	printf(" -T, --gettimeout\tGet the timeout\n");
>   	printf(" -n, --pretimeout=T\tSet the pretimeout to T seconds\n");
> @@ -172,6 +176,7 @@ int main(int argc, char *argv[])
>   {
>   	int flags;
>   	unsigned int ping_rate = DEFAULT_PING_RATE;
> +	unsigned int ping_count = DEFAULT_PING_COUNT;
>   	int ret;
>   	int c;
>   	int oneshot = 0;
> @@ -248,6 +253,12 @@ int main(int argc, char *argv[])
>   				ping_rate = DEFAULT_PING_RATE;
>   			printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
>   			break;
> +		case 'c':
> +			ping_count = strtoul(optarg, NULL, 0);
> +			if (!ping_count)
> +				ping_count = DEFAULT_PING_COUNT;
> +			printf("Number of pings set to %u.\n", ping_count);
> +			break;
>   		case 's':
>   			flags = 0;
>   			oneshot = 1;
> @@ -336,9 +347,10 @@ int main(int argc, char *argv[])
>   
>   	signal(SIGINT, term);
>   
> -	while (1) {
> +	while (ping_count > 0) {
>   		keep_alive();
>   		sleep(ping_rate);
> +		ping_count--;

So this test no longer runs forever?

thanks,
-- Shuah