Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

[Peter Zijlstra <peterz@infradead.org>]

On Wed, 2012-05-16 at 10:00 +0200, Peter Zijlstra wrote:
> On Wed, 2012-05-16 at 14:46 +0800, Alex Shi wrote:
> > diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
> > index 75e888b..ed6642a 100644
> > --- a/include/asm-generic/tlb.h
> > +++ b/include/asm-generic/tlb.h
> > @@ -86,6 +86,8 @@ struct mmu_gather {
> >  #ifdef CONFIG_HAVE_RCU_TABLE_FREE
> >         struct mmu_table_batch  *batch;
> >  #endif
> > +       unsigned long           start;
> > +       unsigned long           end;
> >         unsigned int            need_flush : 1, /* Did free PTEs */
> >                                 fast_mode  : 1; /* No batching   */
> >  
> > diff --git a/mm/memory.c b/mm/memory.c
> > index 6105f47..b176172 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -206,6 +206,8 @@ void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm)
> >         tlb->mm = mm;
> >  
> >         tlb->fullmm     = fullmm;
> > +       tlb->start      = -1UL;
> > +       tlb->end        = 0;
> >         tlb->need_flush = 0;
> >         tlb->fast_mode  = (num_possible_cpus() == 1);
> >         tlb->local.next = NULL;

Also, you just broke compilation on a bunch of archs.. again.