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DateFri, 03 Jul 2009 12:48:44 -0700
From"H. Peter Anvin" <>
SubjectRe: [Bug Fix]: Do 32-bit table calculations in pre-processor
Michael S. Zick wrote:
>
> Good point: (1<<(32-PAGE_SIFT)) would handle other than 4k pages.
>
> I just hardcoded it as a working example of the change from setting
> the page table size by design rather than numeric error.
>

As Jeremy pointed out, it's not wrong as written. gas by design uses
arbitrary-precision arithmetic, and even if it didn't, it would still be
correct: (1 << 32) would collapse to 0, so all the rest of the
calculations would still be right.

Any way you can dump out this value from the vmlinux file (nm vmlinux |
grep MAPPING_BEYOND_END) in both cases? What version of as/binutils do
you have installed?
> And yes, it has 512Mbyte of ram, so 1/2Mbyte page table sounds right to me.

/proc/cpuinfo, please?

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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