linux-kernel - Re: [Xen-devel] [PATCH] xen/p2m: Export set_phys_to

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Message-ID: <20130906143909.GC5140@phenom.dumpdata.com>
Date:	Fri, 6 Sep 2013 10:39:09 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	david.vrabel@...rix.com,
	xen-devel <xen-devel@...ts.xenproject.org>,
	boris.ostrovsky@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen/p2m: Export set_phys_to_machine.

On Fri, Sep 06, 2013 at 03:06:02PM +0100, Jan Beulich wrote:
> >>> On 06.09.13 at 16:00, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > We have already exported 'get_phys_to_machine' and there are
> > third-party drivers that depend on this other symbol. As such
> > lets make this balanced and also export this symbol.
> 
> I tend to disagree: Allowing external modules read access to some
> internal state is quite different from also allowing them to alter it.

I am not following you. We have drivers in the kernel that do
this now. For example xen-netfront uses set_phys_to_machine.

Oddly it can be built as a module.  I am wondering how it actually
works without this EXPORT symbol.

> 
> Jan
> 
> > Reported-by: Yuval Shaia <yuval.shaia@...cle.com>
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> >  arch/x86/xen/p2m.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
> > index 0d4ec35..cdb96bc 100644
> > --- a/arch/x86/xen/p2m.c
> > +++ b/arch/x86/xen/p2m.c
> > @@ -847,6 +847,7 @@ bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
> >  
> >  	return true;
> >  }
> > +EXPORT_SYMBOL_GPL(set_phys_to_machine);
> >  
> >  #define M2P_OVERRIDE_HASH_SHIFT	10
> >  #define M2P_OVERRIDE_HASH	(1 << M2P_OVERRIDE_HASH_SHIFT)
> > -- 
> > 1.8.3.1
> > 
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@...ts.xen.org 
> > http://lists.xen.org/xen-devel 
> 
> 
> 
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