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authorVineet Gupta <vgupta@synopsys.com>2013-09-09 16:04:15 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-11-07 14:34:31 +0530
commit7d0857a54aedbd47b3de503933d65ce462970bd6 (patch)
treebb58cf17cbe9e22baae90cb299caf118e51aaa04
parent57e26e57454fae4f1d15c2e9fa965b7a8046ab34 (diff)
ARC: [SMP] Disallow RTSC
RTSC is strictly incore and must not be allowed in SMP configs Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
-rw-r--r--arch/arc/Kconfig6
-rw-r--r--arch/arc/kernel/time.c7
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;
}