On Tue, 15 Apr 2008, Linus Torvalds wrote:

quoted text
> On Tue, 15 Apr 2008, Ingo Molnar wrote:
> > 
> > btw., now with a second full day spent on this regression, i have 
> > figured out a workaround the hard way: increasing SECTION_SIZE_BITS in 
> > include/asm-x86/sparsemem.h from 26 to 27 makes it go away.
> 
> Interesting.

Hmmmm. SECTION_SIZE_BITS == 26 means SECTIONS_SHIFT == 6. 
Increasing SECTION_SIZE_BITS to 27 reduces SECTION_SHIFT to 5. Thereby 
the number of sparsemem sections (NR_MEM_SECTIONS) is reduced to half (64 
to 32).
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