linux-kernel - Re: [patch 3/8] x86/entry/common: Mark syscall entry points notrace/nokprobe

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Message-ID: <20200227231517.GF21795@lenoir>
Date:   Fri, 28 Feb 2020 00:15:18 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, 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 3/8] x86/entry/common: Mark syscall entry points
 notrace/nokprobe

On Tue, Feb 25, 2020 at 11:08:04PM +0100, Thomas Gleixner wrote:
> Anything before enter_from_user_mode() is not safe to be traced or probed.

Perhaps the changelog should clarify as to why exactly it isn't
safe to trace before enter_from_user_mode(). There have been
so many patches on that lately that I'm not clear on that either.

Thanks.