Re: [PATCH] Gerd Hoffman's move-vsyscall-into-user-address-rangepatch

[Linus Torvalds]

On Fri, 19 May 2006, Andrew Morton wrote:
> > 
> > FC1 is like really ancient. I think there was a glibc bug that caused 
> > vsyscall related init hangs like that. To nevertheless let people run 
> > their old stuff there's a vdso=0 boot option in exec-shield.
>
> 
> Well that patch took a machine from working to non-working.  Pretty serious
> stuff.  We should get to the bottom of the problem so we can assess the
> risk and impact, no?

Yes. And it would be good to have a way to turn it off - either globally 
of by some per-process setup (eg off by default, but turn on when doing 
some magic).

The per-process one would be the harder one, because it would require the 
fixmap entry, but not globally. So I suspect the only practical thing 
would be to have it be a kernel boot-time option.

		Linus
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