[PATCH v4 7/7] ARM: implement support for vmap'ed stacks

[Russell King (Oracle)]

On Wed, Jan 05, 2022 at 11:33:48AM +0000, Jon Hunter wrote:
> On 05/01/2022 11:12, Ard Biesheuvel wrote:
> > Thanks for the report.
> > 
> > It would be helpful if you could provide some more context:
> > - does it happen on a LPAE build too?
> > - does it only happen on SMP capable systems?
> 
> These are all SMP systems.
> 
> > - does it reproduce on such systems when using only a single CPU?
> > (i.e., pass 'nosmp' on the kernel command line)
> 
> I would need to try this.

Please note that I want an answer on the vmap stack patches by the
end of today (UK time - so about five hours after this email has
been sent) as we have only tonight and tomorrow's linux-next before
the probable opening of the merge window.

The options are:

1. The problem gets fixed today and I merge the fix today so it can
   get tested in linux-next over the next few days by the various
   build farms and test setups.
2. We postpone the merging of this until the very end of the merge
   window to give more time to sort out this mess - but what it
   means is keeping it in linux-next and keeping various platforms
   broken during that period. However, this is really not fair for
   other people, and some would say this isn't even an option.
3. We drop the entire series for this merge window, meaning it gets
   dropped from linux-next, and have another go for the neext merge
   window.

Sorry for being so demanding, but we're far too close to the merge
window to be trying to debug a feature that is clearly causing a
regression for several platforms.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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