linux-kernel - Re: [PATCH v2 6/7] x86/power: Sprinkle some noinstr

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Message-ID: <Y8aMhihmrahvFnrU@gmail.com>
Date:   Tue, 17 Jan 2023 12:54:46 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, Joan Bruguera <joanbrugueram@...il.com>,
        linux-kernel@...r.kernel.org, Juergen Gross <jgross@...e.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Jan Beulich <jbeulich@...e.com>,
        Roger Pau Monne <roger.pau@...rix.com>,
        Kees Cook <keescook@...omium.org>, mark.rutland@....com,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Jörg Rödel <joro@...tes.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 6/7] x86/power: Sprinkle some noinstr


* Peter Zijlstra <peterz@...radead.org> wrote:

> Nope, they do as they say on the tin.
> 
> noinstr void foo(void)
> {
> }
> 
> declares the whole function as non-instrumented.
> 
> Within such functions, we demark regions where instrumentation is
> allowed by:
> 
> noinstr void foo(void)
> {
> 	instrumentation_begin();
> 	/* code that calls non-noinstr functions goes here */
> 	instrumentation_end();

Indeed, you are right - I should have gotten more of my morning tea ... :-/

Thanks,

	Ingo