linux-kernel - Re: [patch 7/8] x86/entry: Move irq tracing to prepare_exit_to_user

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Message-ID: <CALCETrV4=1X3MO+HsgxSvJo_Rjw4tr1E7XCY4xHNGA=bhvq7NA@mail.gmail.com>
Date:   Wed, 26 Feb 2020 12:07:26 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 7/8] x86/entry: Move irq tracing to prepare_exit_to_user_mode()

On Wed, Feb 26, 2020 at 11:54 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Andy Lutomirski <luto@...nel.org> writes:
>
> > On 2/25/20 2:08 PM, Thomas Gleixner wrote:
> >> which again gets it out of the ASM code.
> >
> > Why is this better than just sticking the tracing in
> > __prepare_exit_from_usermode() or just not splitting it in the first
> > place?
>
> The split is there because prepare_exit_from_usermode() is used from the
> idtentry maze as well. Once that stuff is converted in the later series
> the split goes away again.
>

Okay.