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| author | James Hogan <james.hogan@imgtec.com> | 2017-02-16 12:39:01 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-12 12:38:34 +0200 |
| commit | 394d71b1ea24c248a8d497d10635b86dd2fccef7 (patch) | |
| tree | c39728183c64148e488a7c3dc4e62cd8710eb6f9 /arch/mips/Kconfig | |
| parent | 0f5d17253b2868a3e75d623dcb2514e305bc7447 (diff) | |
MIPS: Force o32 fp64 support on 32bit MIPS64r6 kernels
commit 2e6c7747730296a6d4fd700894286db1132598c4 upstream.
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: 4e9d324d4288 ("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
Patchwork: https://patchwork.linux-mips.org/patch/15310/
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index db459612de44..75bfca69e418 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -1412,7 +1412,7 @@ config CPU_MIPS32_R6 select CPU_SUPPORTS_MSA select GENERIC_CSUM select HAVE_KVM - select MIPS_O32_FP64_SUPPORT + select MIPS_O32_FP64_SUPPORT if 32BIT help Choose this option to build a kernel for release 6 or later of the MIPS32 architecture. New MIPS processors, starting with the Warrior |