On Sat, Dec 13, 2014 at 05:35:17PM -0800, Linus Torvalds wrote: > On Sat, Dec 13, 2014 at 4:33 PM, Al Viro <v...@zeniv.linux.org.uk> wrote: > > > > So does SMP - this_cpu_dec() relies on preemption being disabled. > > No. really. It very much does not. Not on x86, not elsewhere. It's > part of the whole point of "this_cpu_p()". They are preemption and > interrupt safe. > > It's the "__this_cpu_op()" ones that need external protection.
Right you are - I really need to get some coffee... Sorry... FWIW, do we need to disable interrupts there? After all, mnt_want_write() and mnt_drop_write() shouldn't be done from interrupt context - they can happen via schedule_delayed_work(), but that's it... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
