From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 C5D183A4F3B; Wed, 12 Aug 2026 08:21:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786522923; cv=none; b=KfB4W1eXlselbKJFBQc7HN5pyLM/+k7KgkCxKFt795Mj7OC0ZdYJNdcsJ+sFydabq0q0/T3l1FmJvUIIzIDOpbpBvZYc5IKCfIgLmiiWvlGuxnhp96VjSaeDa1XZz805gCrgmSjUBvCbf0cQSoYf+o1f2qXkUf+5WIEg0arI8aM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786522923; c=relaxed/simple; bh=yqsQWpue8B+DeLdaeK/eQIHORvq4af2g5lNUMfDd1YU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Op2dTp3NFZrRU6Fk1gdBRWKhx7uomH0Oo4cwremQCvPiM+BE3udTbhyDr+tE+KyRteY7kKZHPs+fvW4nlJC0kDIVx3j6RnCb6fIrg/lAwBYyAv9pBHLF/y+MdOn/6n4fw5VRUkZ42ubMrceXXwaf2UoDVZdyFaKUvG+UVkU38WI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=l0CAJctu; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="l0CAJctu" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=yqsQWpue8B+DeLdaeK/eQIHORvq4af2g5lNUMfDd1YU=; b=l0CAJctuOB0yn9quwbmFXDYAfB f37VOzwtWsblKmfeAvXlTJPCISsYEI1/Oj+uLkkZdxZwAx8PZ92wgVRq/oXQV0Sn2+rki3UFnmOjr 8dkV8pLczztgQNDnUD5q1gnjh/GNI4BL1Yp53y7fOA88JktLhWO/2be70t76wxXl9S1BMMi97NCeQ Jmjfoxh3GvbLIuI9KzXMbP7nrchA2OTXqB76BhzBKiDLsfDptimwMPzu2ZVtagyaGHukvk30vAO8a cti11HVRtrRFfqCp7YToEy+qamoivlx6KuG9acOyP6z2ZDjCUOdGafVQxTwek1nk07/QT5I6fDgr/ /IIK55pQ==; Received: from [2001:8b0:10b:5:a3a3:d97e:a004:df29] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wu4DS-00000001gj2-0vdX; Wed, 12 Aug 2026 08:21:38 +0000 Message-ID: <44c51ace9b0dc44b795f6f48c91cda440eed910b.camel@infradead.org> Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Michal Hocko Cc: Steven Rostedt , Jason Gunthorpe , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Sebastian Andrzej Siewior , Clark Williams , Simona Vetter , =?ISO-8859-1?Q?J=E9r=F4me?= Glisse , Christian =?ISO-8859-1?Q?K=F6nig?= , "Paul E. McKenney" , Sean Christopherson , Paolo Bonzini , linux-mm@kvack.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Wed, 12 Aug 2026 09:21:31 +0100 In-Reply-To: References: <20260811135537.GC544626@ziepe.ca> <1d669aca4ffee797b9c29215382444a5b23624b3.camel@infradead.org> <20260811142730.GG544626@ziepe.ca> <20260811104229.72fdd928@gandalf.local.home> <37b83b429b9f14ea6ad4ca1c13cc8e565ec09033.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-v6PlrnGGcaejKBXWxyYj" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-v6PlrnGGcaejKBXWxyYj Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-12 at 10:14 +0200, Michal Hocko wrote: > On Tue 11-08-26 16:24:48, David Woodhouse wrote: > [...] > > I had a second reason for disabling the overzealous check too: to allow > > SRCU grace periods within the notifier callbacks. >=20 > Is there a way that srcu barrier could cause an indirect dependency on > memory allocation? In other words what might block the scru to complete? 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