On 04/02/2014 10:39 AM, Konrad Rzeszutek Wilk wrote:
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index a70fdeb..451e392 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -229,4 +229,4 @@ config ARCH_USE_QUEUE_SPINLOCKconfig QUEUE_SPINLOCK def_bool y if ARCH_USE_QUEUE_SPINLOCK - depends on SMP&& (!PARAVIRT_SPINLOCKS || !XEN) + depends on SMPIf I read this correctly that means you cannot select any more the old ticketlocks? As in, if you select CONFIG_PARAVIRT on X86 it will automatically select ARCH_USE_QUEUE_SPINLOCK which will then enable this by default? Should the 'def_bool' be selectable?
My initial qspinlock patch allows it to be selectable, but there was comment that doing so would increase the testing matrix and so made it less desirable. That was why I made it the default for 64-bit code which are more likely to be used in large machines which benefit the most from this patch. 32-bit kernel will still use the ticket lock.
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