On Wed, Jan 15, 2014 at 07:28:17AM +0100, Ingo Molnar wrote: > > The perhaps only question is if it should be "set/clear_bit_in_msr()" > > rather than having to haul a full 64-bit mask in the common case. I'd prefer the _bit() variant because it is easy to use in all those set-chicken-bit cases. > I'd suggest the introduction of a standard set of methods operating on > MSRs: > > msr_read() > msr_write() > msr_set_bit() > msr_clear_bit() > msr_set_mask() > msr_clear_mask() > > etc. > > msr_read() would essentially map to rdmsr_safe(). Each method has a > return value that can be checked for failure. I'm not sure we want to use the _safe() variants by default as it would generate the exception tables even in cases where they're clearly not needed. > Note that the naming of 'msr_set_bit()' and 'msr_clear_bit()' mirrors > that of bitops, and set_mask/clear_mask is named along a similar > pattern, so that it's more immediately obvious what's going on. Yes, I completely agree - this is something I will do after the merge window. The question about the need for the _mask() variants will be best answered after going over the sources and checking whether there actually is a need for setting more than one bit in an MSR. Thanks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html