[ Refrain from using "unlisted-recipients" please! ] On Mon, 8 Sep 2008, Sujit Karataparambil wrote: > Chirag, > > Kindly understand what xavier is trying to do. He is Trying to disable smp. > The RT - Linux Code is dependent on the mutex lock to perform some > soft/hard real time processing. This is an problem with the mutex lock. It is not a problem with the mutex lock. > > Kindly check with some one before signing off patches. The patch is legit. The problem is simply that functions like flush_tlb_current_task and flush_tlb_mm disable preemption and then call flush_tlb_others. This function locks the tlbstate_lock which is currently a rtmutex. An rtmutex can not be called with preemption disabled. The tlbstate_lock is static, small and confined. I'm not sure we can change this code (flushing the TLB) in a way where we can allow preemption. This may just be a latency that we must hit. -- Steve -- 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
