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ARC: [kbuild] Allow platforms to disable LLSC for !SMP as well

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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>
This commit is contained in:
Vineet Gupta 2013-03-30 15:07:47 +05:30
parent 30ecee8cdd
commit fbf8e13d31
1 changed files with 4 additions and 6 deletions
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10
arch/arc/Kconfig
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@ -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)"