linux-kernel - Re: [PATCH] kernel/sched/core.c: Avoid unused variable on non-SMP configs

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Date:   Sun, 9 Sep 2018 18:36:01 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/sched/core.c: Avoid unused variable on non-SMP configs

Hi Borislav,

On Sun, Sep 9, 2018 at 6:06 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Sun, Sep 09, 2018 at 04:48:19PM +0200, Miguel Ojeda wrote:
>> Indeed. But note that the attribute needs to be written before the
>> variable name so that it applies to both variables (or write it twice)
>
> It warns only about 'steal' - not the other one.

No, you get a different warning depending on whether you have enabled
CONFIG_PARAVIRT_TIME_ACCOUNTING or CONFIG_IRQ_TIME_ACCOUNTING.

In other words, !SMP && IRQ warns about "steal", while !SMP &&
PARAVIRT warns about "irq_delta" (the example warning I posted is for
this last case).

Cheers,
Miguel