linux-kernel - Re: [PATCH 1/6] locking/atomic, asm-generic: instrument ordering variants

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Message-ID: <20180504182422.GT12217@hirez.programming.kicks-ass.net>
Date:   Fri, 4 May 2018 20:24:22 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aryabinin@...tuozzo.com, boqun.feng@...il.com,
        catalin.marinas@....com, dvyukov@...gle.com, mingo@...nel.org,
        will.deacon@....com
Subject: Re: [PATCH 1/6] locking/atomic, asm-generic: instrument ordering
 variants

On Fri, May 04, 2018 at 07:09:09PM +0100, Mark Rutland wrote:
> On Fri, May 04, 2018 at 08:01:05PM +0200, Peter Zijlstra wrote:
> > On Fri, May 04, 2018 at 06:39:32PM +0100, Mark Rutland wrote:

> > >  include/asm-generic/atomic-instrumented.h | 1195 ++++++++++++++++++++++++-----
> > >  1 file changed, 1008 insertions(+), 187 deletions(-)
> > 
> > Is there really no way to either generate or further macro compress this?
> 
> I can definitely macro compress this somewhat, but the bulk of the
> repetition will be the ifdeffery, which can't be macro'd away IIUC.

Right, much like what we already have in linux/atomic.h I suspect,
having to duplicating that isn't brilliant either.

> Generating this with a script is possible -- do we do anything like that
> elsewhere?

There's include/generated/ in your build directory. But nothing on this
scale I think.