linux-kernel - [PATCH v2 15/16] MIPS: require O32 FP64 support for MIPS64 with O32 compat

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Date:	Mon, 27 Jul 2015 12:58:26 -0700
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	Guenter Roeck <linux@...ck-us.net>,
	Matthew Fortune <matthew.fortune@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	"Markos Chandras" <markos.chandras@...tec.com>,
	<stable@...r.kernel.org>, Ralf Baechle <ralf@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2 15/16] MIPS: require O32 FP64 support for MIPS64 with O32 compat

MIPS32r6 code requires FP64 (ie. FR=1) support. Building a kernel with
support for MIPS32r6 binaries but without support for O32 with FP64 is
therefore a problem which can lead to incorrectly executed userland.

CONFIG_MIPS_O32_FP64_SUPPORT is already selected when the kernel is
configured for MIPS32r6, but not when the kernel is configured for
MIPS64r6 with O32 compat support. Select CONFIG_MIPS_O32_FP64_SUPPORT in
such configurations to prevent building kernels which execute MIPS32r6
userland incorrectly.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
Cc: Markos Chandras <markos.chandras@...tec.com>
Cc: <stable@...r.kernel.org> # v4.0-
---

Changes in v2: None

 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f501665..a3b1ffe 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1417,6 +1417,7 @@ config CPU_MIPS64_R6
 	select CPU_SUPPORTS_HIGHMEM
 	select CPU_SUPPORTS_MSA
 	select GENERIC_CSUM
+	select MIPS_O32_FP64_SUPPORT if MIPS32_O32
 	help
 	  Choose this option to build a kernel for release 6 or later of the
 	  MIPS64 architecture.  New MIPS processors, starting with the Warrior
-- 
2.4.6

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