Hi David,
On 07/07/12 01:55, David Woodhouse wrote:
On Thu, 2012-05-10 at 16:55 +1000, g...@snapgear.com wrote:
But if we want to use the uclinux.c mapping driver on real MMU enabled
systems we should be using phys_to_virt() for the translation, since
that is really what we are doing. So change it to do that.
That seems wrong. On a highmem page, phys_to_virt() isn't valid. So at
the very least, any usage of phys_to_virt() needs a stonking great
comment explaining why it's always safe because it can never be used ona
a highmem page.
The only VM based arch this driver can be configured for currently
is m68k (actually it is even more specific, only CONFIG_COLDFIRE).
And that doesn't support HIGHMEM.
Can the kernels data region (and the area immediately after it) be in
high memory?
Regards
Greg
------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: g...@snapgear.com
SnapGear Group, McAfee PHONE: +61 7 3435 2888
8 Gardner Close FAX: +61 7 3217 5323
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com
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