Patch "ARCv2: LLSC: software backoff is NOT needed starting HS2.1c" has been added to the 4.4-stable tree

Patch "ARCv2: LLSC: software backoff is NOT needed starting HS2.1c" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arcv2-llsc-software-backoff-is-not-needed-starting-hs2.1c.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>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");
 }
 
 /*


Patches currently in stable-queue which might be from vgupta@synopsys.com are

queue-4.4/arcv2-check-for-ll-sc-livelock-only-if-llsc-is-enabled.patch
queue-4.4/arcv2-llsc-software-backoff-is-not-needed-starting-hs2.1c.patch