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 E2A7E1DDC1B; Wed, 12 Aug 2026 14:06:01 +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=1786543565; cv=none; b=qN1mmCbEz1MFqX+DgFPLdE3iyUOTPS8gc4Nsn9xBzlFdo7+8WnbvcfO1ZZpiKDpAwhhdI3c2cRg7mz0VsTDfs7TlfYPNK51LbzrfMydnoEQPZve1ImSDJDwyR8Dg3LmVwLSdhcZp9fYCKvgoLzBkJN0Tm8rS1gV0cSo8gt7dsdU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786543565; c=relaxed/simple; bh=PrWmZ3F0DB4ZYJo69A2lp/wzcpXzL0zw6ysSVX/2nJ4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=pHSv99YEdXBFXivcnxitCYr2klw+h+WpgmY/veD69B/EQOOXC9mHT5RQ/AbJ+81A+f/YELPActVahLiDBFWtujsDXpPAQCmB3nMVtcuqFq7JYpioOjIskftqy5sNLRdYb4paV1j5cSrK3XBwpbLxJoGhCIut28zZIzYYGwlNhEw= 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=UAlMGq9+; 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="UAlMGq9+" 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=PrWmZ3F0DB4ZYJo69A2lp/wzcpXzL0zw6ysSVX/2nJ4=; b=UAlMGq9+lxcuhZ7gZqi7pzhN3A 9e9sVLC5+JDQdok6Yw5yh4lTNXzvAMej8j1X60hXURIUuo20aZJG5PUTz2dUSAcbpTTFhtpTMNNO4 7qo4bU6fCpH8nsGlyauSzxLgwd3ggkqZLMVMlMr9V3zqDfRCzDofV+ge938PaUfoDclmxzM/O1kpC xgyGWbGW9a50BJh4P97z3WfUqqrN+Tx5ARkPdqBL+x76D26YV7r5zL78p1mPgvO4T6leOZ+1J9u6e rZWg9k1yFLXOd8EIPuyGzRH1wL+AUZvBsSUrM5PahfClqpPRVhqdDbUJ4lcvdiKLgwAMEqWuj/C3r zchDACJw==; 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 1wu9aX-000000025Ap-3nbE; Wed, 12 Aug 2026 14:05:51 +0000 Message-ID: Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Jason Gunthorpe Cc: Michal Hocko , Steven Rostedt , 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 15:05:43 +0100 In-Reply-To: <20260812134934.GC662699@ziepe.ca> References: <20260811135537.GC544626@ziepe.ca> <1d669aca4ffee797b9c29215382444a5b23624b3.camel@infradead.org> <20260811142730.GG544626@ziepe.ca> <20260811104229.72fdd928@gandalf.local.home> <37b83b429b9f14ea6ad4ca1c13cc8e565ec09033.camel@infradead.org> <44c51ace9b0dc44b795f6f48c91cda440eed910b.camel@infradead.org> <20260812122759.GA662699@ziepe.ca> <20260812134934.GC662699@ziepe.ca> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-R1QKfS3KSQTZPPbu6wkC" 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 --=-R1QKfS3KSQTZPPbu6wkC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-12 at 10:49 -0300, Jason Gunthorpe wrote: > On Wed, Aug 12, 2026 at 02:46:08PM +0100, David Woodhouse wrote: > > I hear you. I'm less sceptical, given the use case, but I'll certainly > > concede that the universe is known for inventing better idiots. > >=20 > > I'm certainly not averse to having a wrapper so that the read sections > > don't just srcu_read_lock() directly, but also get a sanity check > > (non_block_start? local_irq_save? what would it actually be? does it > > have to be different for the hardirq vs. process-context invocations?) > > for free. > >=20 > > Or instead of a GPC-specific wrapper, do we make it a first-class SRCU > > citizen, SRCU_READ_FLAVOR_ATOMIC? If it disables preemption, we'd know > > that lock+unlock must happen on the *same* CPU, which could potentially > > simplify my new try_synchronize_srcu() and/or allow for a *spinning* > > grace period if we really do want that (although I'm unconvinced; it's > > *latency* we care about here, and punting to the WQ when we *already* > > have to wait is fair enough). >=20 > These all seem like good ideas, then you don't need to touch the > notifiers.. I'll rephrase that for my own understanding: *If* we go all the way to building a whole SRCU flavour for this *and* implementing a spin-only variant of srcu_synchronize() which is tailored to the atomic-reader use case, *then* we don't need to remove the non_block_{start,end} guards around the MMU notifiers, which are basically never being called anyway and don't actually seem to protect against any real bugs. 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