Re: [patch] mm: sparsemem memory_present() memory corruption fix

[Christoph Lameter]

> fix memory corruption and crash on 32-bit x86 systems.
> 
> if a !PAE x86 kernel is booted on a 32-bit system with more than
> 4GB of RAM, then we call memory_present() with a start/end that
> goes outside the scope of MAX_PHYSMEM_BITS.

So its a general issue that has been there for years that we are now 
noticing because we are now testing with memory sizes > 4GB. This also 
affects the enterprise releases (SLES10, RHEL5). Argh!

I wonder why this did not show up earlier in testing? Running a kernel 
that cannot access all of memory is unusual I guess.


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