linux-kernel - Re: [PATCH] x86/mm/kaiser: Fix IRQ entries text section mapping

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Message-ID: <20171125150610.29f83ce9@gandalf.local.home>
Date:   Sat, 25 Nov 2017 15:06:10 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev@...glegroups.com, Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] x86/mm/kaiser: Fix IRQ entries text section mapping

On Sat, 25 Nov 2017 17:08:08 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> Tracing uses it to stop the printout of the function graph. Should be safe
> to print the C-Code functions.

It uses it to filter out interrupts, as well as to print the:

"<=========="

"==========>"

annotations. Since function tracing only traces C functions, this will
be lost.

That said, we could possibly replace that check with keeping track
of the hardirq state in the "flags" field of the trace event entry.

-- Steve