On Tue, 11 May 2010 11:37:22 -0400, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, 11 May 2010 19:22:14 +0100 Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
>
> > + reloc_offset = src_priv->gtt_offset;
> > for (page = 0; page < page_count; page++) {
> > - void *s, *d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> > + void __iomem *s;
> > + void *d;
> > +
> > + d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
> > if (d == NULL)
> > goto unwind;
> > - s = kmap_atomic(src_priv->pages[page], KM_USER0);
> > - memcpy(d, s, PAGE_SIZE);
> > - kunmap_atomic(s, KM_USER0);
> > +
> > + s = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
> > + reloc_offset);
> > + memcpy_fromio(d, s, PAGE_SIZE);
> > + io_mapping_unmap_atomic(s);
>
> As mentioned in the other email, this will still corrupt the KM_USER0
> slot, and will generate a debug_kmap_atomic() warning.
How, as kmap_atomic(KM_USER0) is no longer used?
--
Chris Wilson, Intel Open Source Technology Centre
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