linux-kernel - Re: [PATCH 2/2] selftests: watchdog: Add command line option to show watchdog

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Message-ID: <2b08fa83-185b-4eb7-1217-37ed31d810b5@kernel.org>
Date:   Mon, 16 Sep 2019 07:26:41 -0600
From:   shuah <shuah@...nel.org>
To:     Eugeniu Rosca <roscaeugeniu@...il.com>,
        "George G. Davis" <george_davis@...tor.com>,
        Jerry Hoemann <jerry.hoemann@....com>,
        Colin Ian King <colin.king@...onical.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Eugeniu Rosca <erosca@...adit-jv.com>, shuah <shuah@...nel.org>
Subject: Re: [PATCH 2/2] selftests: watchdog: Add command line option to show
 watchdog_info

On 9/7/19 2:58 AM, Eugeniu Rosca wrote:
> From: "George G. Davis" <george_davis@...tor.com>
> 
> A side of affect of commit "selftests: watchdog: Add optional file
> argument" is that arbitrary files may be opened for watchdog testing, e.g.
> /dev/null. To prevent watchdog-test from operating on non-watchdog device
> files, commit "selftests: watchdog: Validate optional file argument" was
> added to validate that a file is indeed a watchdog device via an
> ioctl(WDIOC_GETSUPPORT) call. Since the watchdog_info is available as a
> result of the ioctl(WDIOC_GETSUPPORT) call, add a command line option to
> show the watchdog_info.
> 
> Suggested-by: Eugeniu Rosca <erosca@...adit-jv.com>
> Signed-off-by: George G. Davis <george_davis@...tor.com>
> Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>
> ---
> v1: Applied/tested on commit ce54eab71e210f ("kunit: fix failure to build without printk") of
>      https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next
> 
>   tools/testing/selftests/watchdog/watchdog-test.c | 16 +++++++++++++++-
>   1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
> index 6ed822dc2222..f45e510500c0 100644
> --- a/tools/testing/selftests/watchdog/watchdog-test.c
> +++ b/tools/testing/selftests/watchdog/watchdog-test.c
> @@ -19,7 +19,7 @@
>   
>   int fd;
>   const char v = 'V';
> -static const char sopts[] = "bdehp:t:Tn:NLf:";
> +static const char sopts[] = "bdehp:t:Tn:NLf:i";
>   static const struct option lopts[] = {
>   	{"bootstatus",          no_argument, NULL, 'b'},
>   	{"disable",             no_argument, NULL, 'd'},
> @@ -32,6 +32,7 @@ static const struct option lopts[] = {
>   	{"getpretimeout",       no_argument, NULL, 'N'},
>   	{"gettimeleft",		no_argument, NULL, 'L'},
>   	{"file",          required_argument, NULL, 'f'},
> +	{"info",		no_argument, NULL, 'i'},
>   	{NULL,                  no_argument, NULL, 0x0}
>   };
>   
> @@ -72,6 +73,7 @@ static void usage(char *progname)
>   	printf("Usage: %s [options]\n", progname);
>   	printf(" -f, --file\t\tOpen watchdog device file\n");
>   	printf("\t\t\tDefault is /dev/watchdog\n");
> +	printf(" -i, --info\t\tShow watchdog_info\n");
>   	printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n");
>   	printf(" -d, --disable\t\tTurn off the watchdog timer\n");
>   	printf(" -e, --enable\t\tTurn on the watchdog timer\n");
> @@ -216,6 +218,18 @@ int main(int argc, char *argv[])
>   		case 'f':
>   			/* Handled above */
>   			break;
> +		case 'i':
> +			/*
> +			 * watchdog_info was obtained as part of file open
> +			 * validation. So we just show it here.
> +			 */
> +			oneshot = 1;
> +			printf("watchdog_info:\n");
> +			printf(" identity:\t\t%s\n", info.identity);
> +			printf(" firmware_version:\t%u\n",
> +			       info.firmware_version);
> +			printf(" options:\t\t%08x\n", info.options);
> +			break;
>   
>   		default:
>   			usage(argv[0]);
> 

I would like to see these combined. Please don't add another argument.
Combine patch and 1&2.

thanks,
-- Shuah