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SubjectRe: 4MB pages and framebuffer access, x11perf results, 2.1.125

On Wed, 28 Oct 1998, Linus Torvalds wrote:

> layer how complicates it oevrmuch for little gain. The generated code was
> fairly horrible when everything checked the 4M bit in the PMD (it's
> actualy in the pgd, but I used the pmd macros to clean up the conceptual
> idea).

i think the check could be done within pmd_bad() [pgd_bad()] conditions,
which branches already exist for all relevant cases. Thus the code path
would not differ for normal mappings.

> This is pretty non-negotiable, especially if you ever expect to be able to
> back-port any chages like this into 2.2.x.

yep.

-- mingo


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