Re: [PATCH v2 6/7] kunit: Add 'kunit_shutdown' option

From: Frank Rowand <frowand.list@gmail.com>
To: Brendan Higgins <brendanhiggins@google.com>,
	jdike@addtoit.com, richard@nod.at,
	anton.ivanov@cambridgegreys.com, arnd@arndb.de,
	keescook@chromium.org, skhan@linuxfoundation.org,
	alan.maguire@oracle.com, yzaikin@google.com, davidgow@google.com,
	akpm@linux-foundation.org, rppt@linux.ibm.com
Cc: gregkh@linuxfoundation.org, sboyd@kernel.org,
	logang@deltatee.com, mcgrof@kernel.org, knut.omang@oracle.com,
	linux-um@lists.infradead.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [PATCH v2 6/7] kunit: Add 'kunit_shutdown' option
Date: Tue, 4 Feb 2020 17:05:05 -0600	[thread overview]
Message-ID: <143dcdac-b19a-8eff-b441-ba79f1873801@gmail.com> (raw)
In-Reply-To: <20200130230812.142642-7-brendanhiggins@google.com>

On 1/30/20 5:08 PM, Brendan Higgins wrote:
> From: David Gow <davidgow@google.com>
> 
> Add a new kernel command-line option, 'kunit_shutdown', which allows the
> user to specify that the kernel poweroff, halt, or reboot after
> completing all KUnit tests; this is very handy for running KUnit tests
> on UML or a VM so that the UML/VM process exits cleanly immediately
> after running all tests without needing a special initramfs.

kunit_shutdown needs to be added to Documentation/admin-guide/kernel-parameters.txt

-Frank

> 
> Signed-off-by: David Gow <davidgow@google.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Stephen Boyd <sboyd@kernel.org>
> ---
>  lib/kunit/executor.c                | 20 ++++++++++++++++++++
>  tools/testing/kunit/kunit_kernel.py |  2 +-
>  tools/testing/kunit/kunit_parser.py |  2 +-
>  3 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> index 7fd16feff157e..a93821116ccec 100644
> --- a/lib/kunit/executor.c
> +++ b/lib/kunit/executor.c
> @@ -1,5 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  
> +#include <linux/reboot.h>
>  #include <kunit/test.h>
>  
>  /*
> @@ -11,6 +12,23 @@ extern struct kunit_suite * const * const __kunit_suites_end[];
>  
>  #if IS_BUILTIN(CONFIG_KUNIT)
>  
> +static char *kunit_shutdown;
> +core_param(kunit_shutdown, kunit_shutdown, charp, 0644);
> +
> +static void kunit_handle_shutdown(void)
> +{
> +	if (!kunit_shutdown)
> +		return;
> +
> +	if (!strcmp(kunit_shutdown, "poweroff"))
> +		kernel_power_off();
> +	else if (!strcmp(kunit_shutdown, "halt"))
> +		kernel_halt();
> +	else if (!strcmp(kunit_shutdown, "reboot"))
> +		kernel_restart(NULL);
> +
> +}
> +
>  static void kunit_print_tap_header(void)
>  {
>  	struct kunit_suite * const * const *suites, * const *subsuite;
> @@ -42,6 +60,8 @@ int kunit_run_all_tests(void)
>  		}
>  	}
>  
> +	kunit_handle_shutdown();
> +
>  	if (has_test_failed)
>  		return -EFAULT;
>  
> diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
> index cc5d844ecca13..43314aa537d30 100644
> --- a/tools/testing/kunit/kunit_kernel.py
> +++ b/tools/testing/kunit/kunit_kernel.py
> @@ -141,7 +141,7 @@ class LinuxSourceTree(object):
>  		return True
>  
>  	def run_kernel(self, args=[], timeout=None, build_dir=''):
> -		args.extend(['mem=256M'])
> +		args.extend(['mem=256M', 'kunit_shutdown=halt'])
>  		process = self._ops.linux_bin(args, timeout, build_dir)
>  		with open(os.path.join(build_dir, 'test.log'), 'w') as f:
>  			for line in process.stdout:
> diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
> index 78b3bdd03b1e4..633811dd9bce8 100644
> --- a/tools/testing/kunit/kunit_parser.py
> +++ b/tools/testing/kunit/kunit_parser.py
> @@ -48,7 +48,7 @@ class TestStatus(Enum):
>  	FAILURE_TO_PARSE_TESTS = auto()
>  
>  kunit_start_re = re.compile(r'^TAP version [0-9]+$')
> -kunit_end_re = re.compile('List of all partitions:')
> +kunit_end_re = re.compile(r'reboot: System halted')
>  
>  def isolate_kunit_output(kernel_output):
>  	started = False
>