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	Sun, 26 Jan 2025 00:02:49 +0100
Date: Sun, 26 Jan 2025 00:02:47 +0100
From: Ivan Kokshaysky <ink@unseen.parts>
To: "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc: Magnus Lindholm <linmag7@gmail.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Michael Cree <mcree@orcon.net.nz>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
	rcu@vger.kernel.org, linux-alpha@vger.kernel.org
Subject: Re: Kernel Oops on alpha with kernel version >=6.9.x
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In-Reply-To: <alpine.DEB.2.21.2501252129060.27203@angie.orcam.me.uk>

On Sat, Jan 25, 2025 at 10:06:38PM +0000, Maciej W. Rozycki wrote:
> On Sat, 25 Jan 2025, Ivan Kokshaysky wrote:
> 
> > > >  Here just bumping up the frame size and adjusting offsets in assembly 
> > > > code accordingly so as to account for the empty longword at the bottom 
> > > > of the frame should do, just as I did across my change.
> > > 
> > >  ... or, depending on how you look at it, top of the frame and FAOD in any 
> > > case the longword closest to the stack pointer will be the empty one.
> > 
> > Right. So if we agree on my variant, this addition patch is needed.
> 
>  Erm, that's a good starting point but offsets for the individual register 
> slots need to be updated as well for `do_page_fault' and `do_entUnaUser' 
> to get at the correct ones for those that are at negative indices from the 
> `regs' pointer supplied, i.e. $9 at 8($sp), $10 at 16($sp), etc., and with 
> 0($sp) now unoccupied.  Sorry to get it through unclear after all.

Ah, thanks a lot! Should've noticed that myself, but I've booted with the
last patch and it didn't crash on me, so I thought the deed is done...

I'll fix that tomorrow.

Ivan.