linux-kernel - [PATCH] kunit: fixes Compilation error on s390

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Message-Id: <20250329150320.331018-1-acarmina@redhat.com>
Date: Sat, 29 Mar 2025 15:03:20 +0000
From: Alessandro Carminati <acarmina@...hat.com>
To: linux-kselftest@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Daniel Diaz <daniel.diaz@...aro.org>,
	David Gow <davidgow@...gle.com>,
	Arthur Grillo <arthurgrillo@...eup.net>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	Naresh Kamboju <naresh.kamboju@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxime Ripard <mripard@...nel.org>,
	Ville Syrjala <ville.syrjala@...ux.intel.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Guenter Roeck <linux@...ck-us.net>,
	Alessandro Carminati <alessandro.carminati@...il.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Mickael Salaun <mic@...ikod.net>,
	Kees Cook <kees@...nel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	dri-devel@...ts.freedesktop.org,
	kunit-dev@...glegroups.com,
	linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org,
	linux-next@...r.kernel.org,
	Alessandro Carminati <acarmina@...hat.com>
Subject: [PATCH] kunit: fixes Compilation error on s390

The current implementation of suppressing warning backtraces uses __func__,
which is a compile-time constant only for non -fPIC compilation.
GCC's support for this situation in position-independent code varies across
versions and architectures.

On the s390 architecture, -fPIC is required for compilation, and support
for this scenario is available in GCC 11 and later.

Fixes:  d8b14a2 ("bug/kunit: core support for suppressing warning backtraces")

Signed-off-by: Alessandro Carminati <acarmina@...hat.com>
---
 lib/kunit/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
index 201402f0ab49..6c937144dcea 100644
--- a/lib/kunit/Kconfig
+++ b/lib/kunit/Kconfig
@@ -17,6 +17,7 @@ if KUNIT
 
 config KUNIT_SUPPRESS_BACKTRACE
 	bool "KUnit - Enable backtrace suppression"
+	depends on (!S390 && CC_IS_GCC) || (CC_IS_GCC && GCC_VERSION >= 110000)
 	default y
 	help
 	  Enable backtrace suppression for KUnit. If enabled, backtraces
-- 
2.34.1