From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 13FF82561AB
	for <linux-kernel@vger.kernel.org>; Fri, 30 Jan 2026 16:17:12 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1769789833; cv=none; b=Ufcl4AxadWhyPFODw3kV/RYNM9Uau93OXZomBF/pfioxwBbBkI61eQxaJpFGizBg0BYidaAKNm3PMaweWi2oErVZy+yeTs4AM2QW03HXSWlaIjrdVTPPg+WdogCHXPmrd4Bh8wcLON4+Z8OyBSs6f5YHuXxkKXEpDUNR1+/kIJg=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1769789833; c=relaxed/simple;
	bh=sHnDxdRW99lx+xmRpCCYYm5vuVC3pkuGIo1V8jM843U=;
	h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID:
	 MIME-Version:Content-Type; b=JkayHBPrkLrv9Bwpxdj7T2qFfXTvRYAKkEuyJkb3q8xKLmyu10R7xHlJgeZGZNLGHSQsQkjFpfVxEz0tecpwIlw7QxYXHURgFTwe9ppx8pVcAle87BAAB9Xuf5/mOFPi+UxGoU8IJdcdBxEcNnzZc+CN4t5lgyL5Mc4DuVqZQ5c=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T8gjX3hr; arc=none smtp.client-ip=10.30.226.201
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="T8gjX3hr"
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04257C4CEF7;
	Fri, 30 Jan 2026 16:17:11 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;
	s=k20201202; t=1769789832;
	bh=sHnDxdRW99lx+xmRpCCYYm5vuVC3pkuGIo1V8jM843U=;
	h=From:To:Cc:Subject:In-Reply-To:References:Date:From;
	b=T8gjX3hrVbll026rKhUseD6fXAj6bzKu7rW06iAncc9Tw745WdyLnXr7WjClpqzAM
	 c/PcO5zSf9A6HKiCz3qjrRlB6x+5N+TyayUoLI0GYQubSBQ4mNiBLNazTI8kzp+vO1
	 9DTRne0WOm4zInKHsKwI97JNXjMr8+w1M3TWWmCFfgK+cfy9UJRhnFKo7bDXSBPsBK
	 ZpC0r10X6sgbr+aAkmXNHLPlYm3pIykiC0bYnQ+SvVXiBjVwkkfkhpLQlYQcGpuegl
	 vXfueCl2vHSY6hHy2HGozAkZ4hX7xrw9FhuRaOjPktjfNCxFbaf5J/BqmLTBN5FqiW
	 sYq6VvZk756Cg==
From: Thomas Gleixner <tglx@kernel.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, LKML
 <linux-kernel@vger.kernel.org>
Cc: Ihor Solodrai <ihor.solodrai@linux.dev>, Shrikanth Hegde
 <sshegde@linux.ibm.com>, Peter Zijlstra <peterz@infradead.org>, Michael
 Jeanson <mjeanson@efficios.com>
Subject: Re: [patch 1/4] sched/mmcid: Prevent live lock on task to CPU mode
 transition
In-Reply-To: <154690d7-9e9f-4d36-a89c-7ed1a57c42ae@efficios.com>
References: <20260129210219.452851594@kernel.org>
 <20260129211557.678686545@kernel.org>
 <154690d7-9e9f-4d36-a89c-7ed1a57c42ae@efficios.com>
Date: Fri, 30 Jan 2026 17:17:09 +0100
Message-ID: <87wm0zjcsa.ffs@tglx>
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain

On Fri, Jan 30 2026 at 10:24, Mathieu Desnoyers wrote:
> On 2026-01-29 16:20, Thomas Gleixner wrote:
>>   	if (percpu) {
>>   		mm_cid_fixup_tasks_to_cpus();
>> +		/* Clear the transition bit */
>> +		WRITE_ONCE(mm->mm_cid.transit, 0);
>
> You should move this WRITE_ONCE at the end of
> mm_cid_fixup_tasks_to_cpus() to keep the same pattern as for
> mm_cid_fixup_cpus_to_tasks().

I fixed that up in the wrong patch. Will fold it back into that one.