linux-kernel - Re: [RFC PATCH V2 5/7] x86/entry: don't shift stack on #DB

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Message-ID: <20200526091045.GB325280@hirez.programming.kicks-ass.net>
Date:   Tue, 26 May 2020 11:10:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lai Jiangshan <laijs@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>
Subject: Re: [RFC PATCH V2 5/7] x86/entry: don't shift stack on #DB

On Tue, May 26, 2020 at 01:42:19AM +0000, Lai Jiangshan wrote:
> debug_enter() will disable #DB, there should be no recursive #DB.

should being the operative word.

I have similar patches but was still debating what to do about kgdb, I
think we'll just have to mark it BROKEN for now.