Hi Arnd, >> > >> >These comments are completely useless. What is the specific race >> >that you are protecting against, and why are the implicit barriers >> >not sufficient here? Please find a better way to document what >> >is going on. >> > >> >> The reason for doing this was, when the tlb maintenance ops are called >> by io-pgtable functions, it expects that the tlb_range ops is complete >> only after the tlb_sync callback is called. Previously we were using >> writel and the sync in that case was dummy. Also previously every register >> configuration write was done using writel, which was an overkill. So now >> we do all the writes with writel_relaxed and a barrier in the end. I will >> change the documentation for this. > >If you need the barrier after the write, it probably was already faulty >before, because writel only implies a barrier before the store, not >after. Of course all the barriers likely made the whole process so >slow that you never hit that race in the end. ya, it could have worked in this way and i never saw a race issue before this. The only reason for changing this was to optimise out the additonal barriers that were happening. I do not see any issue now as well, only that the writes would be faster. Regards, Sricharan -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
