On Mon, 14 Jun 2010, Sujit K M wrote: > On Mon, Jun 14, 2010 at 4:35 PM, John Kacur <jkacur@xxxxxxxxxx> wrote: > > > > > > On Mon, 14 Jun 2010, Sujit K M wrote: > > > >> > CONFIG_PREEMPT_RCU=y > >> > # CONFIG_PREEMPT_RCU_TRACE is not set > >> > >> Why is RCU being set to y? > > > > It should be fine to set it to y > > Does Angstrom stable distribution need RCU? > > > > >> > >> > # CONFIG_PREEMPT_NONE is not set > >> > # CONFIG_PREEMPT_VOLUNTARY is not set > >> > # CONFIG_PREEMPT_DESKTOP is not set > >> > >> Fine. > >> > >> > CONFIG_PREEMPT_RT=y > >> > >> This is correct. > >> > >> > CONFIG_PREEMPT=y > >> > CONFIG_PREEMPT_SOFTIRQS=y > >> > CONFIG_PREEMPT_HARDIRQS=y > >> > >> I think this part is susceptible. > > > > Suceptible to what? > > Those setting are all correct. > > In fact, most are automatically set for you after > > choosing CONFIG_PREEMPT_RT=y > > I thought in any Real Time system there can be only SoftIRQ's or > HardIRQ's. Also CONFIG_PREEMPT is an Non RT design. > > > > > His problem is not with the config. > > > > Above I think It is certainly an Config problem. I'm sorry, but that is simply incorrect. Please have a look at kernel/Kconfig.preempt config PREEMPT_RT bool "Complete Preemption (Real-Time)" select PREEMPT_SOFTIRQS select PREEMPT_HARDIRQS select PREEMPT_RCU select RT_MUTEXES This means that if you choose PREEMPT_RT then all those other options are selected automatically for you. config PREEMPT bool default y depends on PREEMPT_DESKTOP || PREEMPT_RT This means that the symbol PREEMPT can only be enabled if PREEMPT_RT (or PREEMPT_DESKTOP instead) are set to y There is nothing wrong with his config. -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
