linux-kernel - Re: [PATCH 1/2] export cpu

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Message-ID: <20090810220613.GA17099@redhat.com>
Date:	Tue, 11 Aug 2009 01:06:13 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [PATCH 1/2] export cpu_tlbstate to modules

On Mon, Aug 10, 2009 at 02:56:46PM -0700, H. Peter Anvin wrote:
> On 08/10/2009 11:53 AM, Michael S. Tsirkin wrote:
> > vhost net module wants to do copy to/from user from a kernel thread,
> > which needs switch_mm (like what fs/aio has).
> > export cpu_tlbstate to make this possible
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  arch/x86/mm/tlb.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
> > index 821e970..e33a5f0 100644
> > --- a/arch/x86/mm/tlb.c
> > +++ b/arch/x86/mm/tlb.c
> > @@ -13,6 +13,7 @@
> >  
> >  DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate)
> >  			= { &init_mm, 0, };
> > +EXPORT_PER_CPU_SYMBOL_GPL(cpu_tlbstate);
> >  
> >  /*
> >   *	Smarter SMP flushing macros.
> 
> Wouldn't it be a *lot* better to move use_mm() from fs/aio.c into common
> code, and export that instead?
> 
> 	-hpa

That's easy too. What would a good place for it be?

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