[Webkit-unassigned] [Bug 214142] [WTF] Fix PackedAlignedPtr for X86_64 canonical addresses

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214142

--- Comment #3 from Jim Mason <jmason at ibinx.com> ---
(In reply to Mark Lam from comment #2)
> Jim, what platform actually allocates user space memory in the range where
> bit 47 of the address is set?  Can you share the detail?

Solaris/illumos.  See https://www.oracle.com/solaris/technologies/memory.html

I first thought this was a Solaris quirk, and for a long time, just self-applied the attached patch to make it work in my environment.  When I learned that X86_64 actually specifies the canonical address space, such that the 'hole' of unusable addresses is in the middle of the virtual space, I reckoned it would be worthwhile to share the fix, so that webkit always does the right thing for this processor architecture.

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