Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > > I use smp_rmb() to do this on SMP systems (hrm, actually, a rmb() could > > be required so it works also on UP systems safely wrt interrupts). > > smp_rmb turns into a compiler barrier on UP and should prevent the below > description. Note that that does not guarantee that the two reads will be done in the order you want. The compiler barrier _only_ affects the compiler. It does not stop the CPU from doing the reads in any order it wants. You need something stronger than smp_rmb() if you need the reads to be so ordered. David -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
