> All these operations are done assuming that tlb_gather_mmu disables > preemption and tlb_finish_mmu enables preemption again. > This is not true for -rt. > For x86, none of the code paths between tlb_gather_mmu and > tlb_finish_mmu access any per_cpu variables. > But this is not true for powerpc64 as we can see. > > One way could be to make tlb_gather_mmu disable preemption as it does > in mainline but only for powerpc. > Although i am not sure, if this is the right step ahead. > > I am attaching a patch below for the same. > I have left out the tce bits, as they are fine. > > Note: I haven't extensively tested the patch A better option is to make sure that a context switch does the right thing, flushing the pending batch. I think that's already the case, which means that your original patch may work, but that needs to be double-checked and commented properly. Cheers, Ben. -- 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
