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 (file)
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -134,9 +134,6 @@ if SMP
 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 @@ config ARC_FPU_SAVE_RESTORE
          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 @@ menuconfig ARC_CPU_REL_4_10
 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)"