linux-kernel - Re: [PATCH v8 7/7] x86, mm: Add set_memory

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Message-ID: <1425493634.17007.248.camel@misato.fc.hp.com>
Date:	Wed, 04 Mar 2015 11:27:14 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, arnd@...db.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, jgross@...e.com,
	stefan.bader@...onical.com, luto@...capital.net, hmh@....eng.br,
	yigal@...xistor.com, konrad.wilk@...cle.com, Elliott@...com
Subject: Re: [PATCH v8 7/7] x86, mm: Add set_memory_wt() for WT

On Thu, 2015-02-26 at 07:44 -0700, Toshi Kani wrote:
> On Thu, 2015-02-26 at 12:30 +0100, Ingo Molnar wrote:
> > * Toshi Kani <toshi.kani@...com> wrote:
> > 
> > > On Wed, 2015-02-25 at 08:22 +0100, Ingo Molnar wrote:
> > > > * Toshi Kani <toshi.kani@...com> wrote:
> > > > 
> > > > > +int set_pages_array_wt(struct page **pages, int addrinarray)
> > > > > +{
> > > > > +	return _set_pages_array(pages, addrinarray, _PAGE_CACHE_MODE_WT);
> > > > > +}
> > > > > +EXPORT_SYMBOL(set_pages_array_wt);
> > > > 
> > > > So by default we make new APIs EXPORT_SYMBOL_GPL(): we 
> > > > don't want proprietary modules mucking around with new code 
> > > > PAT interfaces, we only want modules we can analyze and fix 
> > > > in detail.
> > > 
> > > Right.  I have one question for this case.  This 
> > > set_pages_array_wt() extends the set_pages_array_xx() 
> > > family, which are all exported with EXPORT_SYMBOL() 
> > > today.  In this case, should we keep them exported in the 
> > > consistent manner, or should we still use GPL when adding 
> > > a new one?
> > 
> > Still keep it GPL, it's a new API that old modules 
> > obviously don't use.
> 
> Got it. Thanks for the clarification.

Since this is a minor change and there is no other comment at this
point, I've submitted the updated patch 7/7 alone with the following
subject for saving your mail box. :-)

 [PATCH v8-UPDATE 7/7] x86, mm: Add set_memory_wt() for WT

Thanks,
-Toshi

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