diff options
Diffstat (limited to 'arch/sh/Kconfig')
| -rw-r--r-- | arch/sh/Kconfig | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 2dc3b177193..f645f8416f1 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -692,7 +692,7 @@ source "kernel/Kconfig.preempt" config GUSA def_bool y - depends on !SMP + depends on !SMP && SUPERH32 help This enables support for gUSA (general UserSpace Atomicity). This is the default implementation for both UP and non-ll/sc @@ -704,6 +704,16 @@ config GUSA This should only be disabled for special cases where alternate atomicity implementations exist. +config GUSA_RB + bool "Implement atomic operations by roll-back (gRB) (EXPERIMENTAL)" + depends on GUSA && CPU_SH3 || (CPU_SH4 && !CPU_SH4A) + help + Enabling this option will allow the kernel to implement some + atomic operations using a software implemention of load-locked/ + store-conditional (LLSC). On machines which do not have hardware + LLSC, this should be more efficient than the other alternative of + disabling insterrupts around the atomic sequence. + endmenu menu "Boot options" |