linux-kernel - [PATCH 4.4 20/20] init/Kconfig: make COMPILE_TEST depend on HAS

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Date:   Fri,  9 Apr 2021 11:53:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Johannes Weiner <hannes@...xchg.org>,
        KP Singh <kpsingh@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Terrell <terrelln@...com>,
        Quentin Perret <qperret@...gle.com>,
        Valentin Schneider <valentin.schneider@....com>,
        "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.4 20/20] init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM

From: Masahiro Yamada <masahiroy@...nel.org>

commit ea29b20a828511de3348334e529a3d046a180416 upstream.

I read the commit log of the following two:

- bc083a64b6c0 ("init/Kconfig: make COMPILE_TEST depend on !UML")
- 334ef6ed06fa ("init/Kconfig: make COMPILE_TEST depend on !S390")

Both are talking about HAS_IOMEM dependency missing in many drivers.

So, 'depends on HAS_IOMEM' seems the direct, sensible solution to me.

This does not change the behavior of UML. UML still cannot enable
COMPILE_TEST because it does not provide HAS_IOMEM.

The current dependency for S390 is too strong. Under the condition of
CONFIG_PCI=y, S390 provides HAS_IOMEM, hence can enable COMPILE_TEST.

I also removed the meaningless 'default n'.

Link: https://lkml.kernel.org/r/20210224140809.1067582-1-masahiroy@kernel.org
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: KP Singh <kpsingh@...gle.com>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nick Terrell <terrelln@...com>
Cc: Quentin Perret <qperret@...gle.com>
Cc: Valentin Schneider <valentin.schneider@....com>
Cc: "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 init/Kconfig |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/init/Kconfig
+++ b/init/Kconfig
@@ -65,8 +65,7 @@ config CROSS_COMPILE
 
 config COMPILE_TEST
 	bool "Compile also drivers which will not load"
-	depends on !UML && !S390
-	default n
+	depends on HAS_IOMEM
 	help
 	  Some drivers can be compiled on a different platform than they are
 	  intended to be run on. Despite they cannot be loaded there (or even