linux-hardening - [PATCH] gcc-plugins: Disable GCC_PLUGIN_CYC

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Message-Id: <20210221225650.33134-1-linux@roeck-us.net>
Date:   Sun, 21 Feb 2021 14:56:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...nel.org>
Subject: [PATCH] gcc-plugins: Disable GCC_PLUGIN_CYC_COMPLEXITY for s390

Commit 334ef6ed06fa ("init/Kconfig: make COMPILE_TEST depend on !S390") disabled
COMPILE_TEST for s390. At the same time, "make allmodconfig/allyesconfig" for
s390 is still supported. However, it generates thousands of compiler
messages such as the following, making it highly impractical to run.

Cyclomatic Complexity 1 scripts/mod/devicetable-offsets.c:main
Cyclomatic Complexity 1 scripts/mod/devicetable-offsets.c:_GLOBAL__sub_I_00100_0_main

Since GCC_PLUGIN_CYC_COMPLEXITY is primarily used for testing, disable it
when building s390 images.

Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Fixes: 334ef6ed06fa ("init/Kconfig: make COMPILE_TEST depend on !S390")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 scripts/gcc-plugins/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
index ab9eb4cbe33a..5e9bb500f443 100644
--- a/scripts/gcc-plugins/Kconfig
+++ b/scripts/gcc-plugins/Kconfig
@@ -21,7 +21,7 @@ if GCC_PLUGINS
 
 config GCC_PLUGIN_CYC_COMPLEXITY
 	bool "Compute the cyclomatic complexity of a function" if EXPERT
-	depends on !COMPILE_TEST	# too noisy
+	depends on !COMPILE_TEST && !S390	# too noisy
 	help
 	  The complexity M of a function's control flow graph is defined as:
 	   M = E - N + 2P
-- 
2.17.1