linux-kernel - Re: [PATCH] hugetlb: select PREEMPT_COUNT if HUGETLB_PAGE for in

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Message-ID: <YEnY5hWLT/en7kw1@hirez.programming.kicks-ass.net>
Date:   Thu, 11 Mar 2021 09:46:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>, tglx@...utronix.de,
        john.ogness@...utronix.de, urezki@...il.com, ast@...com,
        Eric Dumazet <edumazet@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hugetlb: select PREEMPT_COUNT if HUGETLB_PAGE for
 in_atomic use

On Wed, Mar 10, 2021 at 06:13:21PM -0800, Mike Kravetz wrote:
> from irq context.  Changing the check in the code from !in_task to
> in_atomic would handle the situations when called with irqs disabled.

It does not. local_irq_disable() does not change preempt_count().