forked from Minki/linux
MIPS: Force o32 fp64 support on 32bit MIPS64r6 kernels
When a 32-bit kernel is configured to support MIPS64r6 (CPU_MIPS64_R6),
MIPS_O32_FP64_SUPPORT won't be selected as it should be because
MIPS32_O32 is disabled (o32 is already the default ABI available on
32-bit kernels).
This results in userland FP breakage as CP0_Status.FR is read-only 1
since r6 (when an FPU is present) so __enable_fpu() will fail to clear
FR. This causes the FPU emulator to get used which will incorrectly
emulate 32-bit FPU registers.
Force o32 fp64 support in this case by also selecting
MIPS_O32_FP64_SUPPORT from CPU_MIPS64_R6 if 32BIT.
Fixes: 4e9d324d42
("MIPS: Require O32 FP64 support for MIPS64 with O32 compat")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 4.0.x-
Patchwork: https://patchwork.linux-mips.org/patch/15310/
Signed-off-by: James Hogan <james.hogan@imgtec.com>
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@ -1531,7 +1531,7 @@ config CPU_MIPS64_R6
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select CPU_SUPPORTS_HIGHMEM
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select CPU_SUPPORTS_MSA
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select GENERIC_CSUM
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select MIPS_O32_FP64_SUPPORT if MIPS32_O32
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select MIPS_O32_FP64_SUPPORT if 32BIT || MIPS32_O32
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select HAVE_KVM
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help
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Choose this option to build a kernel for release 6 or later of the
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