| From b31ac42697bef4a3aa5d0aa42375a55657f57174 Mon Sep 17 00:00:00 2001 |
| From: Vineet Gupta <vgupta@synopsys.com> |
| Date: Tue, 15 Mar 2016 11:36:43 +0530 |
| Subject: ARCv2: LLSC: software backoff is NOT needed starting HS2.1c |
| |
| From: Vineet Gupta <vgupta@synopsys.com> |
| |
| commit b31ac42697bef4a3aa5d0aa42375a55657f57174 upstream. |
| |
| Signed-off-by: Vineet Gupta <vgupta@synopsys.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| arch/arc/Kconfig | 2 +- |
| arch/arc/kernel/setup.c | 5 ----- |
| 2 files changed, 1 insertion(+), 6 deletions(-) |
| |
| --- a/arch/arc/Kconfig |
| +++ b/arch/arc/Kconfig |
| @@ -387,7 +387,7 @@ config ARC_HAS_LLSC |
| |
| config ARC_STAR_9000923308 |
| bool "Workaround for llock/scond livelock" |
| - default y |
| + default n |
| depends on ISA_ARCV2 && SMP && ARC_HAS_LLSC |
| |
| config ARC_HAS_SWAPE |
| --- a/arch/arc/kernel/setup.c |
| +++ b/arch/arc/kernel/setup.c |
| @@ -332,11 +332,6 @@ static void arc_chk_core_config(void) |
| pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n"); |
| else if (!cpu->extn.fpu_dp && fpu_enabled) |
| panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n"); |
| - |
| - if (is_isa_arcv2() && IS_ENABLED(CONFIG_SMP) && cpu->isa.atomic && |
| - IS_ENABLED(CONFIG_ARC_HAS_LLSC) && |
| - !IS_ENABLED(CONFIG_ARC_STAR_9000923308)) |
| - panic("llock/scond livelock workaround missing\n"); |
| } |
| |
| /* |
