[PATCH v3] kunit: fix longest symbol length test

["Sergio González Collado" <sergio.collado@gmail.com>]

The kunit test that checks the longests symbol length [1], has triggered
warnings in some pilelines when symbol prefixes are used [2][3]. The test
will to depend on !PREFIX_SYMBOLS and !CFI_CLANG as sujested in [4] and
on !GCOV_KERNEL.

[1] https://lore.kernel.org/rust-for-linux/CABVgOSm=5Q0fM6neBhxSbOUHBgNzmwf2V22vsYC10YRBT=kN1g@mail.gmail.com/T/#t
[2] https://lore.kernel.org/all/20250328112156.2614513-1-arnd@kernel.org/T/#u
[3] https://lore.kernel.org/rust-for-linux/bbd03b37-c4d9-4a92-9be2-75aaf8c19815@infradead.org/T/#t
[4] https://lore.kernel.org/linux-kselftest/20250427200916.GA1661412@ax162/T/#t

Reviewed-by: Rae Moar <rmoar@google.com>
Signed-off-by: Sergio González Collado <sergio.collado@gmail.com>
---
v2 -> v3: added dependency on !GCOV_KERNEL (to avoid __gcov_ prefix)
---
v1 -> v2: added dependency on !CFI_CLANG as suggested in [3], removed
	CONFIG_ prefix
---
 lib/Kconfig.debug                | 1 +
 lib/tests/longest_symbol_kunit.c | 3 +--
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f9051ab610d5..e55c761eae20 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2886,6 +2886,7 @@ config FORTIFY_KUNIT_TEST
 config LONGEST_SYM_KUNIT_TEST
 	tristate "Test the longest symbol possible" if !KUNIT_ALL_TESTS
 	depends on KUNIT && KPROBES
+	depends on !PREFIX_SYMBOLS && !CFI_CLANG && !GCOV_KERNEL
 	default KUNIT_ALL_TESTS
 	help
 	  Tests the longest symbol possible
diff --git a/lib/tests/longest_symbol_kunit.c b/lib/tests/longest_symbol_kunit.c
index e3c28ff1807f..9b4de3050ba7 100644
--- a/lib/tests/longest_symbol_kunit.c
+++ b/lib/tests/longest_symbol_kunit.c
@@ -3,8 +3,7 @@
  * Test the longest symbol length. Execute with:
  *  ./tools/testing/kunit/kunit.py run longest-symbol
  *  --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y
- *  --kconfig_add CONFIG_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n
- *  --kconfig_add CONFIG_MITIGATION_RETPOLINE=n
+ *  --kconfig_add CONFIG_CPU_MITIGATIONS=n --kconfig_add CONFIG_GCOV_KERNEL=n
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

base-commit: 1a80a098c606b285fb0a13aa992af4f86da1ff06
-- 
2.39.2