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From: Yury Norov <ynorov@nvidia.com>
To: Bibo Mao <maobibo@loongson.cn>
Cc: Yury Norov <yury.norov@gmail.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: One question about API cpumask_setall()
Date: Tue, 28 Jul 2026 21:55:31 -0400	[thread overview]
Message-ID: <amldg42TIxaJLaU8@yury> (raw)
In-Reply-To: <e19cfdea-d592-8506-4cba-efd37e51d459@loongson.cn>

On Tue, Jul 28, 2026 at 04:16:27PM +0800, Bibo Mao wrote:
> Hi,
> 
> I am preparing to use API cpumask_setall() for TLB flush on LoongArch KVM
> side. There are cpumask_test_and_clear_cpu/cpumask_setall() APIs, it seems
> that API cpumask_setall() does not support atomic operation.
> 
> Do you think it is reasonable to add new API similar with cpumask_setall()
> which supports atomic operation?

Maybe reasonable, but it's impossible. cpumask is a bitmap, which in
turn is an array of unsigned longs. There's no atomic operations on
arrays.

Thanks,
Yury

  reply	other threads:[~2026-07-29  1:55 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-28  8:16 One question about API cpumask_setall() Bibo Mao
2026-07-29  1:55 ` Yury Norov [this message]
2026-07-29  2:13   ` Bibo Mao
2026-07-29 17:57     ` Yury Norov

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