RE: [PATCH] mm/hugetlb: reduce arch dependent code about huge_pmd_unshare

[Luck, Tony]

> Memory fails me.  Why do some architectures (arm, arm64, x86_64) want
> huge_pmd_[un]share() while other architectures (ia64, tile, mips,
> powerpc, metag, sh, s390) do not?

Potentially laziness/ignorance-of-feature?  It looks like this feature started on x86_64 and then spread
to arm*.

Huge pages are weird on ia64 in that they have to be in a specific range of virtual addresses (region 4).
But I don't see why that would prevent sharing pmd's.

-Tony

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