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 464A11EBFE0; Wed, 26 Aug 2026 07:38:52 +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=1787729937; cv=none; b=Ess2V4KHOTK+0XebC+fzVoY5CQGxqnlQC67VJj67dwvRFPx76PnGbPs8f9p5YYvuDeHMh0P+SHiPA2syrlG8piXUtQ2aFGb9DEwvSPm8yl/wk0EbzvWVY0AgB0cMKVLjmjytWxMUeEGf9i4np44WIO1/9p5fFeT5Sm+sel095jo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787729937; c=relaxed/simple; bh=8KDuBkXGCz+P6syp9QJ1MdTVjN8HtP6OLknPrQ0iOV8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=TN1qLHkJa+wrHIjX+L2kCl9Ixx08ZyJ4iaxiYJDqaVvKtvEUp586f5iXW/sBRfz93Y80KX8b7yV2uL3zUmKfn3GidOGhbmes8Zbzp+jwxSbednnOfaHY/9Txt1V1xsMtBXTjETVKBdMl8fxvqewVZe1DABo2uaTvzYkcDGdINWg= 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=m++6N3rm; 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="m++6N3rm" 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=8KDuBkXGCz+P6syp9QJ1MdTVjN8HtP6OLknPrQ0iOV8=; b=m++6N3rmB361/00HHqKVSkwG0Z nFdmyXLrW9Qxu2zNyNoxXmDkROjixacnZ0qdl2IBFSGD04GJqmctjoA9l5ESm3/5wOBsu0vF5q9o5 SSbAbsZBbOeTjp5swtZKz2LkaatzGD3hPouJMNk3qCUyU9EZBTdIvFvsasF/pXbFER7xHI1vXVRFa qaUdvU0s3NrXl883qCDNdHlhxAbXNnNo7GpouUkTl1b3nQF3YN/7m5qs5uksgnbWDpBC9w0Gvihqq SsIFO3NnKT6u6Eg0bgU+/fXN3zcf8k/TclDxYU/I9r+/MaZ5uYG4fhy6zSrqXkry7BsR2SzglwUU+ V3EeDTWQ==; Received: from [2001:8b0:10b:5:faaa:2547:1b33:7d6f] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wz8DW-0000000AUWH-38NB; Wed, 26 Aug 2026 07:38:39 +0000 Message-ID: Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Sebastian Andrzej Siewior , "Paul E. McKenney" Cc: Sean Christopherson , Jason Gunthorpe , Michal Hocko , Steven Rostedt , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Clark Williams , Simona Vetter , Jerome Glisse , Christian Koenig , Paolo Bonzini , linux-mm@kvack.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Wed, 26 Aug 2026 08:38:27 +0100 In-Reply-To: <20260826073233.T-KtFXmj@linutronix.de> References: <333c4cdb-8f34-4e3f-a47f-961f47e089a0@paulmck-laptop> <11dcf5a87125451897982f728c1f65a5151987e4.camel@infradead.org> <69567965-48fd-48c5-abb6-0699d7f5bd16@paulmck-laptop> <124af87fb49c267eeb26b8b4d952b9b1a5b3fb68.camel@infradead.org> <9427a8e0-3ba6-4f31-a35d-54429bd7e071@paulmck-laptop> <3d0463b6099d4fcde9a025a2f9e231d75303b61c.camel@infradead.org> <20260826073233.T-KtFXmj@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xQ80iZVICoRkknB277yo" 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 --=-xQ80iZVICoRkknB277yo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-26 at 09:32 +0200, Sebastian Andrzej Siewior wrote: > On 2026-08-25 13:51:14 [-0700], Paul E. McKenney wrote: > > Very good, preemption disabling it is!=C2=A0 It is quite possible that = the > > PREEMPT_RT guys will need something else, but one thing at a time. >=20 > This reminds me of classic RCU ;) It might work in this use case but I > am afraid that other users might come along where it actually hurts. > With PREEMPT LAZY the preemption within the read-section should > hopefully be the exception. Given the way that PREEMPT_RT treats other locks like spinlocks and rwlocks =E2=80=94 turning them into sleeping locks =E2=80=94 I suspect it m= akes most sense, and is consistent, to also turn rcu_read_lock_atomic() and synchronize_rcu_atomic() into plain rcu_read_lock() and try_synchronize_srcu()+synchronize_scru_expedited(). --=-xQ80iZVICoRkknB277yo Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw 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