linux-kernel - Re: [PATCH v2 7/9] sched: define TIF_ALLOW

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Message-ID: <87zg1gtmb8.ffs@tglx>
Date:   Thu, 21 Sep 2023 02:14:03 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ankur Arora <ankur.a.arora@...cle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        willy@...radead.org, mgorman@...e.de, rostedt@...dmis.org,
        jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        jgross@...e.com, andrew.cooper3@...rix.com
Subject: Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED

On Wed, Sep 20 2023 at 22:51, Thomas Gleixner wrote:
> On Wed, Sep 20 2023 at 07:22, Ankur Arora wrote:
>
> The preempt count folding is an optimization which simplifies the
> preempt_enable logic:
>
> 	if (--preempt_count && need_resched())
> 		schedule()
> to
> 	if (--preempt_count)
> 		schedule()

That should be (!(--preempt_count... in both cases of course :)