4.17-stable review patch. If anyone has any objections, please let me know.
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From: Vineet Gupta vgupta@synopsys.com
commit af1fc5baa724c63ce1733dfcf855bad5ef6078e3 upstream.
This manifsted as strace segfaulting on HSDK because gcc was targetting the accumulator registers as GPRs, which kernek was not saving/restoring by default.
Cc: stable@vger.kernel.org #4.14+ Signed-off-by: Vineet Gupta vgupta@synopsys.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arc/Kconfig | 2 +- arch/arc/plat-hsdk/Kconfig | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-)
--- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -408,7 +408,7 @@ config ARC_HAS_DIV_REM
config ARC_HAS_ACCL_REGS bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6)" - default n + default y help Depending on the configuration, CPU can contain accumulator reg-pair (also referred to as r58:r59). These can also be used by gcc as GPR so --- a/arch/arc/plat-hsdk/Kconfig +++ b/arch/arc/plat-hsdk/Kconfig @@ -7,5 +7,7 @@
menuconfig ARC_SOC_HSDK bool "ARC HS Development Kit SOC" + depends on ISA_ARCV2 + select ARC_HAS_ACCL_REGS select CLK_HSDK select RESET_HSDK