linux-kernel - Re: [PATCH v2 8/9] irqentry: define irqentry_exit_allow

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Message-ID: <8734zk1v3n.fsf@oracle.com>
Date:   Mon, 11 Sep 2023 10:24:28 -0700
From:   Ankur Arora <ankur.a.arora@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     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,
        tglx@...utronix.de, jon.grimm@....com, bharata@....com,
        raghavendra.kt@....com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: Re: [PATCH v2 8/9] irqentry: define irqentry_exit_allow_resched()


Peter Zijlstra <peterz@...radead.org> writes:

> On Wed, Aug 30, 2023 at 11:49:57AM -0700, Ankur Arora wrote:
>
>> +#ifdef TIF_RESCHED_ALLOW
>> +#define irqentry_exit_cond_resched_dynamic_disabled	irqentry_exit_allow_resched
>> +#else
>>  #define irqentry_exit_cond_resched_dynamic_disabled	NULL
>> +#endif
>
> per ^, the below comments are not entirely accurate, since not every
> architecture has TIF_RESCHED_ALLOW, perhaps make it:
>
>> @@ -8692,25 +8694,25 @@ EXPORT_SYMBOL(__cond_resched_rwlock_write);
>>   *
>>   *
>>   * NONE:
>> - *   cond_resched               <- __cond_resched
>> - *   might_resched              <- RET0
>> - *   preempt_schedule           <- NOP
>> - *   preempt_schedule_notrace   <- NOP
>> - *   irqentry_exit_cond_resched <- NOP
>> + *   cond_resched                <- __cond_resched
>> + *   might_resched               <- RET0
>> + *   preempt_schedule            <- NOP
>> + *   preempt_schedule_notrace    <- NOP
>> + *   irqentry_exit_cond_resched  <- irqentry_exit_allow_resched
>
> + *   irqentry_exit_cond_resched  <- NOP / irqentry_exit_allow_resched
>
> Or something.
>
> Also, why did you add that extra whilespace all over? Makes it a bit
> harder to see what actually changed.

Yeah, not sure why I didn't catch that. Will fix.

--
ankur