linux-kernel - Re: [PATCH v2 13/14] futex: Enable FUTEX2

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Date:   Mon, 07 Aug 2023 23:15:23 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, axboe@...nel.dk
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, dvhart@...radead.org, dave@...olabs.net,
        andrealmeid@...lia.com, Andrew Morton <akpm@...ux-foundation.org>,
        urezki@...il.com, hch@...radead.org, lstoakes@...il.com,
        Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        malteskarupke@....de
Subject: Re: [PATCH  v2 13/14] futex: Enable FUTEX2_{8,16}

On Mon, Aug 07 2023 at 14:18, Peter Zijlstra wrote:
>  
>  	/*
> +	 * Encode the futex size in the offset. This makes cross-size
> +	 * wake-wait fail -- see futex_match().
> +	 *
> +	 * NOTE that cross-size wake-wait is fundamentally broken wrt
> +	 * FLAGS_NUMA but could possibly work for !NUMA.

Don't give people ideas :)

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>