linux-kernel - Re: [PATCH 8/9] irqentry: define irqentry_exit_allow

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Date:   Tue, 04 Apr 2023 11:38:18 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc:     torvalds@...ux-foundation.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,
        willy@...radead.org, mgorman@...e.de, peterz@...radead.org,
        rostedt@...dmis.org, vincent.guittot@...aro.org, jon.grimm@....com,
        bharata@....com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com, ankur.a.arora@...cle.com
Subject: Re: [PATCH 8/9] irqentry: define irqentry_exit_allow_resched()

On Sun, Apr 02 2023 at 22:22, Ankur Arora wrote:
> Allow threads marked TIF_ALLOW_RESCHED to be rescheduled in irqexit.
>
> This is only necessary under !preempt_model_preemptible() for which
> we reuse the same logic as irqentry_exit_code_resched().

This tells what this patch is doing but completely fails to explain why
this is necessary and useful.

Thanks,

        tglx