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@xxxxxxxxxx>
> > ---
> > 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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