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Date: Tue, 20 May 2025 21:18:16 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
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	linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.linux.dev, K Prateek Nayak <kprateek.nayak@amd.com>,
	David Matlack <dmatlack@google.com>,
	Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Subject: Re: [PATCH v2 08/12] sched/wait: Drop WQ_FLAG_EXCLUSIVE from
 add_wait_queue_priority()
Message-ID: <20250520191816.GJ16434@noisy.programming.kicks-ass.net>
References: <20250519185514.2678456-1-seanjc@google.com>
 <20250519185514.2678456-9-seanjc@google.com>
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In-Reply-To: <20250519185514.2678456-9-seanjc@google.com>

On Mon, May 19, 2025 at 11:55:10AM -0700, Sean Christopherson wrote:
> Drop the setting of WQ_FLAG_EXCLUSIVE from add_wait_queue_priority() to
> differentiate it from add_wait_queue_priority_exclusive().  The one and
> only user add_wait_queue_priority(), Xen privcmd's irqfd_wakeup(),
> unconditionally returns '0', i.e. doesn't actually operate in exclusive
> mode.

I find:

drivers/hv/mshv_eventfd.c:      add_wait_queue_priority(wqh, &irqfd->irqfd_wait);
drivers/xen/privcmd.c:  add_wait_queue_priority(wqh, &kirqfd->wait);

I mean, it might still be true and all, but hyperv seems to also use
this now.