Re: Linux-2.5.16

["David S. Miller" <davem@redhat.com>]

   From: Linus Torvalds <torvalds@transmeta.com>
   Date: Mon, 20 May 2002 09:13:22 -0700 (PDT)

   See what I mean? You can share all the generic stuff, and only differ in
   the details.

I think it is easier to make tlb_{start,end}_vma do the cache/tlb
flushing, and then change tlb_flush_mmu() to look something like:

static inline void tlb_flush_mmu(mmu_gather_t *tlb, unsigned long start, unsigned long end)
{
        unsigned long nr;

-       flush_tlb_mm(tlb->mm);
+       tlb_flush_mm(tlb->mm);
        nr = tlb->nr;
        if (nr != ~0UL) {
                unsigned long i;
                tlb->nr = 0;
                for (i=0; i < nr; i++)
                        free_page_and_swap_cache(tlb->pages[i]);
        }
}

Architectures define tlb_flush_mm() as appropriate, on x86 it would
be just flush_tlb_mm(mm), on Sparc/PPC/etc. which uses the VMA
flushing it would just be a NOP.

This allows to share all of the infrastructure, with just a few
overrides for the arch specific bits.