From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 D3F974A2071 for ; Thu, 3 Sep 2026 12:20:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788438024; cv=none; b=P+04+wDuccKTfAEO/nhcUxlmmRS67wf58xhbLpe6f+FTddZt1H8qql+hjP5p4QWI4DLctD2rphYzfQ7681ECO//EjyPhRxVZwWa6VCJBGgSQJ6m0zJGZ/InpJRBZ8pA26pAaqUmF/b4ZSZZwp0Bwa8kA+AoouMmceZAInoDhEIk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788438024; c=relaxed/simple; bh=7+zEDhgLWPK1XyD5mUsSnmEhVXTXJkMHK19vEUPudT8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Wz/InAm5HP3YFtFh72nTB+lyJ10bdlOdA4FE6Oy2KeHHm0WeP5HNPj3Egeoaoelcdz8llCYmDgY0LlJcdmB2lKjlt9HmoFR3vOaFlISnleOO8jv4IHgDd+9qIK25Avq6+XzdSPdNz+qJTotrDLwjzkTFRDlXHpN5Rdx3wXT5AFw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=DyS3SeZV; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=OXXbT6pv; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="DyS3SeZV"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="OXXbT6pv" Date: Thu, 3 Sep 2026 14:20:17 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1788438019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7+zEDhgLWPK1XyD5mUsSnmEhVXTXJkMHK19vEUPudT8=; b=DyS3SeZVU1oCPuyaUa/hJqDNRZSK2QuFyXMqAXGk/wIbgfVFxz8PAqOOPkFHIz6lr/K+7K sgTVDzz3XBQJrWnQbvFVTOejpGNHUdB5jrQ7F4X5YPveIjFMyfH47lxKujcFvl2Mcm+MR5 /TGrHkOhjZr0PEs4iK3AnoBztLqD2jdWG04MXjknk95BQRbg24SfiAhpKcf09kpaCoYEUT 9oFwmUwa5uo0peRN3y6kCv48pMLFFrfeLY9Ff+e8lRc5CyM69WLqp5+8fswTda1uxm5jlt n8pHaaOHkEue9B8ZNMoUBqtBkiDej6pw+xQb9k3b6uEhbwGsc5+xGhj7Kd6p7A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1788438019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=7+zEDhgLWPK1XyD5mUsSnmEhVXTXJkMHK19vEUPudT8=; b=OXXbT6pvMz8GouTFFJR6oi68/wS0kQ+/jZ98n83pzAe3Sz/cPVTh6U3OYsqlCNcmVuVfe5 3EyXpOCJCBlBdCDA== From: Sebastian Andrzej Siewior To: Karl Mehltretter Cc: Peter Zijlstra , Thomas Gleixner , Clark Williams , Steven Rostedt , Boqun Feng , Lyude Paul , Joel Fernandes , Alexander Potapenko , linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH] softirq: Preserve interrupt context during IRQ exit Message-ID: <20260903122017.ZRsTFeks@linutronix.de> References: <20260903112737.49551-1-kmehltretter@gmail.com> 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=utf-8 Content-Disposition: inline In-Reply-To: <20260903112737.49551-1-kmehltretter@gmail.com> On 2026-09-03 13:27:37 [+0200], Karl Mehltretter wrote: > __irq_exit_rcu() drops HARDIRQ_OFFSET before deferred hrtimer rearm, > softirq dispatch, and timersd wakeup. This work is still on the IRQ > return path, but in_task() reports task context. Is this new? I don't remember seeing this before. Sebastian