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From: Michal Suchanek <msuchanek@suse.de>
To: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v11 6/8] powerpc/64: Make COMPAT user-selectable disabled on
 littleendian by default.
Date: Thu, 19 Mar 2020 13:19:34 +0100
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Cc: Mark Rutland <mark.rutland@arm.com>,
 Gustavo Luiz Duarte <gustavold@linux.ibm.com>,
 Peter Zijlstra <peterz@infradead.org>,
 Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
 linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
 Jiri Olsa <jolsa@redhat.com>, Rob Herring <robh@kernel.org>,
 Michael Neuling <mikey@neuling.org>,
 Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
 Masahiro Yamada <masahiroy@kernel.org>, Nayna Jain <nayna@linux.ibm.com>,
 Alexander Shishkin <alexander.shishkin@linux.intel.com>,
 Ingo Molnar <mingo@redhat.com>, Allison Randal <allison@lohutok.net>,
 Jordan Niethe <jniethe5@gmail.com>, Michal Suchanek <msuchanek@suse.de>,
 Valentin Schneider <valentin.schneider@arm.com>, Arnd Bergmann <arnd@arndb.de>,
 Arnaldo Carvalho de Melo <acme@kernel.org>,
 Alexander Viro <viro@zeniv.linux.org.uk>,
 Jonathan Cameron <Jonathan.Cameron@huawei.com>,
 Namhyung Kim <namhyung@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
 Hari Bathini <hbathini@linux.ibm.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Nicholas Piggin <npiggin@gmail.com>, Claudio Carvalho <cclaudio@linux.ibm.com>,
 Eric Richter <erichte@linux.ibm.com>,
 "Eric W. Biederman" <ebiederm@xmission.com>, linux-fsdevel@vger.kernel.org,
 "David S. Miller" <davem@davemloft.net>,
 Thiago Jung Bauermann <bauerman@linux.ibm.com>
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

On bigendian ppc64 it is common to have 32bit legacy binaries but much
less so on littleendian.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
v3: make configurable
---
 arch/powerpc/Kconfig | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 497b7d0b2d7e..29d00b3959b9 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -264,8 +264,9 @@ config PANIC_TIMEOUT
 	default 180
 
 config COMPAT
-	bool
-	default y if PPC64
+	bool "Enable support for 32bit binaries"
+	depends on PPC64
+	default y if !CPU_LITTLE_ENDIAN
 	select COMPAT_BINFMT_ELF
 	select ARCH_WANT_OLD_COMPAT_IPC
 	select COMPAT_OLD_SIGACTION
-- 
2.23.0