Re: Bug in kernel code?

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <20020827.212649.102436426.davem@redhat.com>
By author:    "David S. Miller" <davem@redhat.com>
In newsgroup: linux.dev.kernel
>
>    From: "Stephen Biggs" <s.biggs@softier.com>
>    Date: Tue, 27 Aug 2002 21:29:06 -0700
> 
>    You tell me.  You're saying a billion pages (((unsigned long)(~0)) >> 2) also crashes) is never 
>    going to be realistically possible?
> 
> On a 32-bit system?  No.  x86 cpus are architectually limited
> to 64GB of memory, shift that right by PAGE_SIZE (13) and we're
> still within bounds.                   ^^^^^^^^^^^^^^
> 

PAGE_SHIFT, 12.

The maximum possible page count of any known 32-bit system (64 GB @ 4K
for x86) is 2^24 pages.

	-hpa
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