Re: one question about pgd allocation

[Andi Kleen]

"liyu@WAN" <liyu@xxxxxxxxxxxx> writes:
> 
>     I can not understand this. I search intel developer mannal. but
> nothing to help.
> Who can tell me why?

bit 0 is the present bit which needs to be set on the PGD, otherwise
the CPU will ignore it. A clearer way to write this would have been

        __pgd(__pa(pmd) | _PAGE_PRESENT)

-Andi
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