linux-kernel - [PATCH 19/23] kcov: imply GCC_PLUGINS and GCC_PLUGIN

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Date:   Sat, 17 Feb 2018 03:38:47 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 19/23] kcov: imply GCC_PLUGINS and GCC_PLUGIN_SANCOV instead of select'ing them

As Documentation/kbuild/kconfig-language.txt notes, 'select' should be
used with care - it forces a lower limit of another symbol, ignoring
the dependency.  In this case, KCOV can select GCC_PLUGINS even if
'depends on HAVE_GCC_PLUGINS' is unmet.

'imply' is modest enough to observe the dependency, and this makes
sense.  If you enable KCOV, you will probably want to enable
GCC_PLUGIN_SANCOV, but it should not break the dependency.

I also remove unneeded code, I just happened to notice.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 lib/Kconfig.debug | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6088408..1216ce6 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -743,8 +743,8 @@ config KCOV
 	bool "Code coverage for fuzzing"
 	depends on ARCH_HAS_KCOV
 	select DEBUG_FS
-	select GCC_PLUGINS if !COMPILE_TEST
-	select GCC_PLUGIN_SANCOV if !COMPILE_TEST
+	imply GCC_PLUGINS
+	imply GCC_PLUGIN_SANCOV
 	help
 	  KCOV exposes kernel code coverage information in a form suitable
 	  for coverage-guided fuzzing (randomized testing).
@@ -758,7 +758,6 @@ config KCOV
 config KCOV_ENABLE_COMPARISONS
 	bool "Enable comparison operands collection by KCOV"
 	depends on KCOV
-	default n
 	help
 	  KCOV also exposes operands of every comparison in the instrumented
 	  code along with operand sizes and PCs of the comparison instructions.
@@ -768,7 +767,7 @@ config KCOV_ENABLE_COMPARISONS
 config KCOV_INSTRUMENT_ALL
 	bool "Instrument all code by default"
 	depends on KCOV
-	default y if KCOV
+	default y
 	help
 	  If you are doing generic system call fuzzing (like e.g. syzkaller),
 	  then you will want to instrument the whole kernel and you should
-- 
2.7.4