ARCv2: LLSC: software backoff is NOT needed starting HS2.1c

commit b31ac42697bef4a3aa5d0aa42375a55657f57174 upstream.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 6312f607932fd2241782827cce2ec7968ea3c8b6..2d785f5a30418170db9e8f5871334df86f0ccecc 100644 (file)
--- 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

diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index 87ddeeb03f603b4056ea801bc95b4ca2a4167683..05131805aa3310027c2c159d0c109e615f02d87a 100644 (file)
--- 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");
 }
 
 /*