[PATCH 4.1 014/123] MIPS: Require O32 FP64 support for MIPS64 with O32 compat

From: Greg Kroah-Hartman
Date: Sat Aug 08 2015 - 18:11:19 EST

4.1-stable review patch. If anyone has any objections, please let me know.


From: Paul Burton <paul.burton@xxxxxxxxxx>

commit 4e9d324d4288b082497c30bc55b8ad13acc7cf01 upstream.

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@xxxxxxxxxx>
Cc: Markos Chandras <markos.chandras@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: Matthew Fortune <matthew.fortune@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/10674/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1417,6 +1417,7 @@ config CPU_MIPS64_R6
+ select MIPS_O32_FP64_SUPPORT if MIPS32_O32
Choose this option to build a kernel for release 6 or later of the
MIPS64 architecture. New MIPS processors, starting with the Warrior

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