On 2015/3/5 8:18, Rafael J. Wysocki wrote: > On Thursday, March 05, 2015 07:50:26 AM Li, Aubrey wrote: >> On 2015/2/13 0:24, Rafael J. Wysocki wrote: >>> On Thursday, February 12, 2015 02:26:43 PM Peter Zijlstra wrote: >>>> >>>> Why bother with enter_freeze() for any but the deepest state (C6 in this >>>> case)? >>> >>> User space may disable the deepest one (and any of them in general) via sysfs >>> and there's no good reason to ignore its choice in this particular case while >>> we're honoring it otherwise. >>> >>> So the logic is basically "find the deepest one which isn't disabled" and >>> setting the pointers costs us nothing really. >>> >> >> If the user has chance to disable C6 via /sys, that means c6 works? >> Shouldn't we ignore user space setting during freeze? Otherwise, we will >> lost S0ix? > > We can't ignore it, because we don't know the reason why the state was > disabled. > > It may just not work reliably enough on the given platform. > okay, make sense to me. Thanks, -Aubrey -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
