linux-kernel - Re: [PATCH] x86/apic: Remove logical destination mode for 64-bit

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Message-ID: <fb5d23fc-2d47-4142-be88-701c4209fc7a@leemhuis.info>
Date: Fri, 6 Sep 2024 10:34:09 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Borislav Petkov <bp@...en8.de>, Christian Heusel <christian@...sel.eu>
Cc: Thomas Gleixner <tglx@...utronix.de>, Rob <rob@...endal.co.uk>,
 regressions@...ts.linux.dev, x86@...nel.org, Joerg Roedel <joro@...tes.org>,
 Tony Luck <tony.luck@...el.com>, LKML <linux-kernel@...r.kernel.org>,
 Paul Menzel <pmenzel@...gen.mpg.de>, Lyude Paul <lyude@...hat.com>
Subject: Re: [PATCH] x86/apic: Remove logical destination mode for 64-bit

On 05.09.24 16:04, Borislav Petkov wrote:
> On Thu, Sep 05, 2024 at 03:28:47PM +0200, Christian Heusel wrote:
>> Now since it's summer people are maybe on vacation and I hope it got
>> stuck there because of cocktails on the beach and so on 😆🍹
> 
> Yep, check. :)
> The patch is on its way to 6.12:
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/apic&id=838ba7733e4e3a94a928e8d0a058de1811a58621

Hmmm. Please help me out here: why was that fix queued for -next and not
for this cycle?

Was that patch when it was committed considered too dangerous for
mainlining this cycle (at this point of the cycle I guess it might)? I
mean, it's afaics (not totally sure here, the change is missing a Fixes:
tag as well as Closes: tags pointing to the report) fixing a regression
with f0551af02130 that Christian reported (see start of this thread, e.g.,
https://lore.kernel.org/all/12df8b45-6100-4c8b-b82a-a6a75bed2e05@heusel.eu/
). And f0551af02130 is from v6.9-rc1, so given what Linus wrote in
https://lore.kernel.org/all/CAHk-=wis_qQy4oDNynNKi5b7Qhosmxtoj1jxo5wmB6SRUwQUBQ@mail.gmail.com/
that fix should likely have been (or still should be?) merged in this
cycle, unless it's really dangerous.

Or did I misunderstood something here?

Ciao, Thorsten

P.S.: While at it:

#regzbot fix: x86/apic: Remove logical destination mode for 64-bit