linux-kernel - [PATCH] kunit: tool: cosmetic: don't specify duplicate kunit

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Date:   Thu,  7 Apr 2022 12:39:02 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com, davidgow@...gle.com
Cc:     linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Daniel Latypov <dlatypov@...gle.com>
Subject: [PATCH] kunit: tool: cosmetic: don't specify duplicate kunit_shutdown's

Context:
When using a non-UML arch, kunit.py will boot the test kernel with these
options by default:
> mem=1G console=tty kunit_shutdown=halt console=ttyS0 kunit_shutdown=reboot

For QEMU, we need to use 'reboot', and for UML we need to use 'halt'.
If you switch them, kunit.py will hang until the --timeout expires.

So the code currently unconditionally adds 'kunit_shutdown=halt' but
then appends 'reboot' when using QEMU (which overwrites it).

This patch:
Having these duplicate options is a bit noisy.
Switch so we only add 'halt' for UML.

I.e. we now get
UML: 'mem=1G console=tty console=ttyS0 kunit_shutdown=halt'
QEMU: 'mem=1G console=tty console=ttyS0 kunit_shutdown=reboot'

Side effect: you can't overwrite kunit_shutdown on UML w/ --kernel_arg.
But you already couldn't for QEMU, and why would you want to?

Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
---
 tools/testing/kunit/kunit_kernel.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index 483f78e15ce9..9731ceb7ad92 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -158,7 +158,7 @@ class LinuxSourceTreeOperationsUml(LinuxSourceTreeOperations):
 	def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
 		"""Runs the Linux UML binary. Must be named 'linux'."""
 		linux_bin = os.path.join(build_dir, 'linux')
-		return subprocess.Popen([linux_bin] + params,
+		return subprocess.Popen([linux_bin] + params + ['kunit_shutdown=halt'],
 					   stdin=subprocess.PIPE,
 					   stdout=subprocess.PIPE,
 					   stderr=subprocess.STDOUT,
@@ -332,7 +332,7 @@ class LinuxSourceTree(object):
 	def run_kernel(self, args=None, build_dir='', filter_glob='', timeout=None) -> Iterator[str]:
 		if not args:
 			args = []
-		args.extend(['mem=1G', 'console=tty', 'kunit_shutdown=halt'])
+		args.extend(['mem=1G', 'console=tty'])
 		if filter_glob:
 			args.append('kunit.filter_glob='+filter_glob)
 

base-commit: b04d1a8dc7e7ff7ca91a20bef053bcc04265d83a
-- 
2.35.1.1178.g4f1659d476-goog