ARC: [SMP] Disallow RTSC

RTSC is strictly incore and must not be allowed in SMP configs

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2 files changed, 5 insertions, 8 deletions

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index fb4177e48260..5ede5460c806 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -136,9 +136,6 @@ if SMP
 config ARC_HAS_COH_CACHES
         def_bool n
 
-config ARC_HAS_COH_RTSC
-        def_bool n
-
 config ARC_HAS_REENTRANT_IRQ_LV2
         def_bool n
 
@@ -332,8 +329,7 @@ config ARC_HAS_RTSC
         bool "Insn: RTSC (64-bit r/o cycle counter)"
         default y
         depends on ARC_CPU_REL_4_10
-        # if SMP, enable RTSC only if counter is coherent across cores
-        depends on !SMP || ARC_HAS_COH_RTSC
+        depends on !SMP
 
 endmenu   # "ARC CPU Configuration"
 
diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c
index 0a9b6b289c4f..e5f3a837fb35 100644
--- a/arch/arc/kernel/time.c
+++ b/arch/arc/kernel/time.c
@@ -63,9 +63,10 @@
 
 int arc_counter_setup(void)
 {
-        /* RTSC insn taps into cpu clk, needs no setup */
-
-        /* For SMP, only allowed if cross-core-sync, hence usable as cs */
+        /*
+         * For SMP this needs to be 0. However Kconfig glue doesn't
+         * enable this option for SMP configs
+         */
         return 1;
 }