On Wed, Jan 21, 2015 at 12:37:44AM +0100, Stefan Agner wrote:
> Add early fixmap support, initially to support permanent, fixed
> mapping support for early console. A temporary, early pte is
> created which is migrated to a permanent mapping in paging_init.
> This is also needed since the attributs may change as the memory
> types are initialized. The 3MiB range of fixmap spans two pte
> tables, but currently only one pte is created for early fixmap
> support.
I think this needs to be done more carefully - I think the entry(ies)
should be removed, the TLBs flushed, and the new entry established.
So:
> +static void __init early_fixmap_shutdown(void)
> +{
> + int i;
> +
> + pte_offset_fixmap = &pte_offset_late_fixmap;
> + pmd_clear(fixmap_pmd(fix_to_virt(__end_of_permanent_fixed_addresses -
> 1)));
I think you should flush tlbs here.
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according to speedtest.net.
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