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SubjectRe: [regression, bisected] x86: efi: Pass boot services variable info to runtime code

* Russ Anderson <rja@sgi.com> wrote:

> On Thu, May 30, 2013 at 10:32:09PM +0000, Matthew Garrett wrote:
> > On Thu, 2013-05-30 at 17:28 -0500, Russ Anderson wrote:
> > > On Thu, May 30, 2013 at 10:21:53PM +0000, Matthew Garrett wrote:
> > > > On Thu, 2013-05-30 at 17:17 -0500, Russ Anderson wrote:
> > > >
> > > > > That's a great idea. This patch moves the QueryVariableInfo()
> > > > > call from bootime to runtime, in efi_late_init(). The attached
> > > > > patch is consistent with the UEFI spec and avoids the problem.
> > > >
> > > > No, that defeats the entire point of the original patch.
> > >
> > > How so? It is still calling QueryVariableInfo()
> > > before the data is used.
> >
> > We want to know how much space is used by variables that aren't visible
> > at runtime.
>
> We want to boot. We could boot up through 3.9-rc7.
>
> Knowing how much space is used by variables that aren't
> visible at runtime it moot if you can't boot.

Exactly - fixing a boot regression is _WAY_ more important than pretty
much any other concern.

and the boot breakage is not limited to UV systems - the thread mentioned
a couple of other systems as well.

So it's an absolute no-brainer that this change should be reverted or
fixed via your patch.

Once a safer mechanism is implemented to call QueryVariableInfo() earlier
(Boris's patches?) the change can be reintroduced.

Thanks,

Ingo


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