[PATCH 4.4 049/146] ARCv2: LLSC: software backoff is NOT needed starting HS2.1c
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2016-07-25 20:59:37
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4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vineet Gupta <redacted> commit b31ac42697bef4a3aa5d0aa42375a55657f57174 upstream. Signed-off-by: Vineet Gupta <redacted> 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"); } /*