patch disabling use of PSE on Atom CPUs with a certain erratum

[Jan Beulich]

In commit 7a0fc404ae663776e96db43879a0fa24fec1fa3a you
disable use of PSE, but I wonder how this can take any effect on
64-bit CPUs, as they use large pages during early boot already.
Those pages, when use of PSE gets disabled, will get broken up
into 4k pages in phys_pmd_init(), thus actually increasing the
chances that you hit the erratum.

What am I missing?

Jan

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