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 0692E2459DC; Fri, 29 Aug 2025 19:34:32 +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=1756496074; cv=none; b=uWITmJ8rESBxxlSEYftrHzDHKt/+Nolmg34a9DtyjZGvrke2Fkurq/vfWzN9wU9bLWQ0mPyYdS/30yQFbP08Z5jCYERKcYcnIBGgHfmK66UicnV+3RJb/FFhkwdWsDaAfRacAsej4rv5t/QymfJgCH2+vq6+/bLSmqBTwUzV2GY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756496074; c=relaxed/simple; bh=+w9IkauBo7cCrLno5CGhc+wFecYIkjUGCI33AwCLl1g=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=nxdGGKEpH1ZZ2Tq9OlPgYSS0TTa1TEzx8elWGkyKuqi+wk8/qLXMMu9cALobT+cFTnzXKYsxwddlptZmmEqebZWRkvMSEa9jF4QRiwg0Dx20EaFiDr/zQux3pFHQwCSYYGvWPH7kYDqvQhrbIkEHASnINS7ThQZbYlUIUzJOSJI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AwAneyXr; 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="AwAneyXr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A0F0C4CEF0; Fri, 29 Aug 2025 19:34:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756496072; bh=+w9IkauBo7cCrLno5CGhc+wFecYIkjUGCI33AwCLl1g=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=AwAneyXrbjTglb77Jlm1LivVok9uTtra8zlDYIRPlvCoYO/pFigepdh249SWSQF8c wfcwYYNBTK9bEaTVXl92mlUFq66F0AjKNDbmwr3VsOKRNMA5XglUiyAD7YdIwdRhA7 aTiU9geLUb4y1LE2h1HKwKRRYnLBomrFLNc56Az5wTz8eRaXy9KW9pWV2fbWo4ZI4l Tf/OaiR+d5pKuRAapMJe6jo9n46JTAkHx1LsawhqMPOp+mLworCz/QsBQFkuKNy/pl EZFrAYJ+mRRe12j/XsInY3n8Ygr7Zo+SMNzv5RcOMDqIdY2Y4+LuWUsDSoljAjLY4R dJzhkkEj9Q+BA== Date: Fri, 29 Aug 2025 09:34:31 -1000 From: Tejun Heo To: Sebastian Andrzej Siewior Cc: linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Lai Jiangshan , Ingo Molnar , Peter Zijlstra , Steven Rostedt , Thomas Gleixner Subject: Re: [PATCH] softirq: Provide a handshake for canceling tasklets via polling on PREEMPT_RT Message-ID: References: <20250820103657.vDuDuLx6@linutronix.de> <20250820105518.Yf36NzJd@linutronix.de> <20250821092827.zcFpdnNy@linutronix.de> <20250822094812.L4hiquhY@linutronix.de> <20250826154942.BcGs2_U5@linutronix.de> <20250828160455.4dxzTug1@linutronix.de> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250828160455.4dxzTug1@linutronix.de> Hello, Sebastian. On Thu, Aug 28, 2025 at 06:04:55PM +0200, Sebastian Andrzej Siewior wrote: > On 2025-08-26 06:27:27 [-1000], Tejun Heo wrote: > > Oh yeah, that makes a lot of sense to me - splitting it out into something > > which is named explicitly to discourage further usages. > > I am a bit lost now. Do you intend to apply the patch and we came up > with the bh-canceling-from-bh API later on or what is the plan? I'd much prefer if the end result is that the busy waiting is a separate API. Whether that's done in a single patch or incremental patches doesn't really matter. Thanks. -- tejun