linux-kernel - Re: [PATCH v2 16/18] x86: io: implement dummy relaxed accessor macros for writes

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Message-ID: <20140523155626.GI30445@twins.programming.kicks-ass.net>
Date:	Fri, 23 May 2014 17:56:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Will Deacon <will.deacon@....com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"monstr@...str.eu" <monstr@...str.eu>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"broonie@...aro.org" <broonie@...aro.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 16/18] x86: io: implement dummy relaxed accessor
 macros for writes

On Fri, May 23, 2014 at 08:43:01AM -0700, H. Peter Anvin wrote:
> On 05/23/2014 08:34 AM, Will Deacon wrote:
> > 
> > There is also a documentation patch [1] in this series but, again, I didn't
> > CC everybody on it. Sorry, but the level of interest this sort of stuff
> > generates amongst kernel developers is close to zero so I only included
> > people I thought cared on CC for the entire series. I'm stuck between a rock
> > and a hard place trying to CC interested people whilst at the same time
> > trying to avoid spamming all the arch maintainers.
> > 
> 
> If you are sending me a patch, please include me on the cover letter for
> the patch series.  You don't have to send me the entire patch series
> (although for something like a Documentation patch which affects x86 I
> would consider including the union list as well.)
> 
> I think regardless of level of interest, the definition of
> cross-architectural operations is exactly the arch maintainers job, so
> it isn't really out of place to "spam" us...

So the one issue I had with that, is that if one tries to send an email
to all arch maintainers + linux-arch + linux-kernel, the header gets too
big and vger chokes and davem slaps you.

So while its possibly desirable to do big unions with 0/xx and the like,
its practically infeasible.

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