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Commit 7d0857a5 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: [SMP] Disallow RTSC 



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

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 57e26e57

arch/arc/Kconfig

+1 −5
Original line number Diff line number Diff line
@@ -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"

arch/arc/kernel/time.c

+4 −3
Original line number Diff line number Diff line
@@ -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;

}