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xen-devel
Re: [Xen-devel] Re: [Xen-changelog] Linux scrubs memory before returnign
> > +#ifdef CONFIG_XEN_SCRUB_PAGES
> > + else
> > + {
> > + void *p = kmap(&mem_map[*currp]);
> > + scrub_pages(p, 1);
> > + kunmap(&mem_map[*currp]);
> > + }
> > +#endif
>
> Since scrub_pages() becomes a NOOP when the config option
> is not set, why the additional #ifdef in the source code ?
Avoids an unnecessary kmap/kunmap, which in Xen would both trap to
ring 0. I don't know if it would make much of a performance
difference, but I decided to ifdef the whole thing just in case.
I hope you like the abuse of __dev_alloc_skb() :-)
-- Keir
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