linux-kernel - Re: Kernel broken on processors without performance counters

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Message-ID: <26442.1437522599@turing-police.cc.vt.edu>
Date:	Tue, 21 Jul 2015 19:49:59 -0400
From:	Valdis.Kletnieks@...edu
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Jason Baron <jasonbaron0@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Vince Weaver <vince@...ter.net>,
	"hillf.zj" <hillf.zj@...baba-inc.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Kernel broken on processors without performance counters

On Tue, 21 Jul 2015 12:29:21 -0700, Andy Lutomirski said:

> That's not what I meant.  We do something in the C code that tells the
> build step which way the initial state goes.  At link time, we make
> the initial state actually work like that.  Then, at run time, we can
> still switch it again if needed.

OK, that's something different than what I read the first time around.

I'm thinking that a good adjective would be "brittle", in the face of
recalcitrant GCC releases.  Look at the fun we've had over the years
getting things that *should* be fairly intuitive to work correctly (such
as "inline").

Having said that, if somebody comes up with something that actually
works, I'd be OK with it...

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