ARCH_FREE_PTE_NR 5350 on x86_64

Hi,

Looking at the tlb_flush code path and its co-relation with
ARCH_FREE_PTE_NR, on x86-64 architecture. I think we still don't use
the ARCH_FREE_PTE_NR of 5350 as the caching value for the mmu_gathers
structure, instead fallback to using 506 due to some typo errors in
the code.

Found this link in the archives.

http://www.ussg.iu.edu/hypermail/linux/kernel/0509.1/1821.html

I don't think anything has been done on this yet (looked at 2.6.23).
Do let me know if its only a typo that needs a fix, or we are still
waiting for some other other changes to come into effect.

Thanks,
Alok.
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