linux-kernel - Re: [patch V6 23/37] x86/entry: Provide IDTENTRY

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Date:   Wed, 20 May 2020 17:07:49 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        "Peter Zijlstra \(Intel\)" <peterz@...radead.org>
Subject: Re: [patch V6 23/37] x86/entry: Provide IDTENTRY_SYSVEC

Andy Lutomirski <luto@...nel.org> writes:

> On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>>
>> Provide a IDTENTRY variant for system vectors to consolidate the different
>> mechanisms to emit the ASM stubs for 32 an 64 bit.
>>
>> On 64bit this also moves the stack switching from ASM to C code. 32bit will
>> excute the system vectors w/o stack switching as before. As some of the
>> system vector handlers require access to pt_regs this requires a new stack
>> switching macro which can handle an argument.
>
> Is that last sentence obsolete?

Yes.

> Otherwise,
>
> Acked-by: Andy Lutomirski <luto@...nel.org>