On Thu, 12 Oct 2000, Ingo Molnar wrote:

[...] pgd_clear() should stay a 64-bit operation [...]

even this isnt strictly necessery - pgds and pmds are allocated in 'low
memory', and thus a simple 32-bit write to the lower 32 bits of the pgd
entry is enough to clear a PAE pgd. But it still must be a special case
due to the pgd present-bit restriction.

	Ingo

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