Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c -bisected

[Linus Torvalds]

On Tue, 26 Aug 2008, Mike Travis wrote:
> 
> The need to allow distros to set NR_CPUS=4096 (and NODES_SHIFT=9) is
> critical to our upcoming SGI systems using what we have been calling
> "UV".

That's fine. You can do it. The default kernel will not, because it's 
clearly not safe.

I really don't care what you do to _your_ images. But I will not 
distribute a known-broken kernel, and I will not debug random stack 
overflows that happen in it.

If you want the default kernel to support 4k cores, we'll need to fix the 
stack usage.  I don't think that is impossible, but IT IS NOT GOING TO 
HAPPEN for 2.6.27.

And quite frankly, if some vendor like RedHat enables NR_CPUS=4096 by 
default, they are totally and utterly crazy.

But some SGI-specific binary that is meant for SGI machines only, and has 
been extensively tested with the setup used on SGI machines is a different 
thing.

			Linus
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