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Re: [Xen-devel] [PATCH 2/10] linux 2.6.18: COMPAT_VDSO

On 5/3/07 14:48, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> It's gonna be really old libc-s that need an absolutely invariable address.
> But
> you certainly recall that in 2.6.16 (and probably earlier) we had a hack to
> map
> it in right below PAGE_OFFSET, which worked too for not really new but also
> not really old libc-s. It is those intermediate libc (supporting AT_SYSINFO
> but
> not AT_SYSINFO_EHDR) versions that the option attempts to address for
> Xen. I happen to have a SuSE 9.0 system still in active use that doesn't work
> without this option, and I think glibc 2.3.2 shouldn't be considered entirely
> obsolete, yet.

The build-system approach looks simplest (certainly smaller than the C code)
but is impenetrable to read. I think we'd take that approach if you add some
comments to explain what's going on in the makefile runes.

 -- Keir

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