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SubjectRe: 2.6.12-rc2-mm1
Christoph Hellwig writes:

> - the magic CONFIG_COMPAT changes for SHM handles should only be done when
> a module is set. CONFIG_COMPAT is set for mostly 64bit systems that can
> run 32bit code and drm shouldn't behave differently just because we can
> run 32bit code.

Yes it should - we can have a 64-bit X server and a 32-bit DRI
client. In this case the server will allocate a _DRM_SHM area and
pass the handle to the client, which will then try to mmap the area.
If we give a 64-bit handle to the server the client won't be able to
access the area.

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