ARC: [kbuild] Allow platforms to disable LLSC for !SMP as well
Currently ARC_HAS_LLSC can be influenced by platform for SMP only using
ARC_HAS_COH_LLSC. For !SMP it defaults to "y".
It turns out that some customers can't support it all, even in UP.
So we change the semantics, and use a negative dependency ARC_CANT_LLSC.
Any platform (independent of SMP or !SMP) can select it to disable LLSC.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index e6f4eca..44541f1 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -134,9 +134,6 @@
config ARC_HAS_COH_CACHES
def_bool n
-config ARC_HAS_COH_LLSC
- def_bool n
-
config ARC_HAS_COH_RTSC
def_bool n
@@ -304,6 +301,9 @@
based on actual usage of FPU by a task. Thus our implemn does
this for all tasks in system.
+config ARC_CANT_LLSC
+ def_bool n
+
menuconfig ARC_CPU_REL_4_10
bool "Enable support for Rel 4.10 features"
default n
@@ -314,9 +314,7 @@
config ARC_HAS_LLSC
bool "Insn: LLOCK/SCOND (efficient atomic ops)"
default y
- depends on ARC_CPU_770
- # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
- depends on !SMP || ARC_HAS_COH_LLSC
+ depends on ARC_CPU_770 && !ARC_CANT_LLSC
config ARC_HAS_SWAPE
bool "Insn: SWAPE (endian-swap)"