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

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Message-ID: <1424961893.17007.139.camel@misato.fc.hp.com>
Date:	Thu, 26 Feb 2015 07:44:53 -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 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.
-Toshi

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