Re: linux-next: build failure after merge of the tip tree
From: Ingo Molnar
Date: Tue Jan 21 2014 - 05:47:30 EST
* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Mon, Jan 20, 2014 at 04:39:45PM -0500, Len Brown wrote:
> > > As a side note, at minimum the semantic and compatibility difference
> > > needs to be _very_ clearly present in the naming. Something like
> > > mwait_old_() or mwait_core2_(). That way such dependencies and
> > > assumptions don't get lost in code restructuring, etc.
> > Agreed.
> > We started with mwait_idle() -- which was erroneously removed
> > and is now being restored under it original name.
> > The "new" function is mwait_idle_with_hints() -- which uses the
> > additional hints that were not available w/ the original MWAIT
> > instruction. Where "new" is Core Duo and later -- all the
> > processor that can use MWAIT for C-states deeper than C1.
> I'm still waiting for someone to explain what's wrong with:
> static inline void mwait_idle(void)
> mwait_idle_with_hints(0, 0);
Absolutely agreed, we don't want to carry it on 'just because', the
compatibility aspect needs to be documented - otherwise we degrade
into cargo cult programming.
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