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ARC: [SMP] Disallow RTSC

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

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-09-09 16:04:15 +05:30
parent 57e26e5745
commit 7d0857a54a
2 changed files with 5 additions and 8 deletions
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6
arch/arc/Kconfig
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@ -136,9 +136,6 @@ if SMP
config ARC_HAS_COH_CACHES config ARC_HAS_COH_CACHES
def_bool n def_bool n
config ARC_HAS_COH_RTSC
def_bool n
config ARC_HAS_REENTRANT_IRQ_LV2 config ARC_HAS_REENTRANT_IRQ_LV2
def_bool n def_bool n
@ -332,8 +329,7 @@ config ARC_HAS_RTSC
bool "Insn: RTSC (64-bit r/o cycle counter)" bool "Insn: RTSC (64-bit r/o cycle counter)"
default y default y
depends on ARC_CPU_REL_4_10 depends on ARC_CPU_REL_4_10
# if SMP, enable RTSC only if counter is coherent across cores depends on !SMP
depends on !SMP || ARC_HAS_COH_RTSC
endmenu # "ARC CPU Configuration" endmenu # "ARC CPU Configuration"

7
arch/arc/kernel/time.c
View File

@ -63,9 +63,10 @@
int arc_counter_setup(void) int arc_counter_setup(void)
{ {
/* RTSC insn taps into cpu clk, needs no setup */ /*
* For SMP this needs to be 0. However Kconfig glue doesn't
/* For SMP, only allowed if cross-core-sync, hence usable as cs */ * enable this option for SMP configs
*/
return 1; return 1;
} }