On Fri, 27 Aug 2004 17:19:11 -0700 (PDT)
Christoph Lameter <clameter@sgi.com> wrote:

> That is still 2^(32+12) = 2^44 = 16TB.

It's actually:

	2 ^ (31 + PAGE_SHIFT)

'31' because atomic_t is 'signed' and PAGE_SHIFT should
be obvious.

Christoph definitely has a point, this is even more virtual space
than most of the 64-bit platforms even support.  (Sparc64 is
2^43 and I believe ia64 is similar)  and this limit actually
mostly comes from the 3-level page table limits.

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