linux-kernel - RE: [PATCH] x86/split_lock: Make life miserable for split lockers

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Message-ID: <fce8ed8b5ea94cdfa265e5dca01e0c11@intel.com>
Date:   Tue, 8 Mar 2022 17:12:33 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH] x86/split_lock: Make life miserable for split lockers

> I still do not like the inconsistent state between the TIF flag and the
> SLD MSR.

If I'm updating the "warn" option to work this way, I think I can make the TIF flag
and the code that updates the MSR in context switch go away. But need to work
though the patch to make sure I'm not missing something.

-Tony