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 C54FA30AAA9; Tue, 4 Aug 2026 12:49:18 +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=1785847764; cv=none; b=JWt0VT6X6qGWksd5wFsgPP/ojExsboLuArU3IU3jXYiKeU+hCCpwu442TQMUFLer2bHS3kremsm952Y2Ezh2R1OCvEi9XZ/vsHYt2sDh4u+PS8ABR2zalispvpvWWn+AcT3HZBLo+QraiHJcctiK8ahRTgubfLoLdro+O+9ssew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785847764; c=relaxed/simple; bh=0ulQb8z1SfLY1enZwXYQIgz0Cv27HjiPwCW1cZp/d8M=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=X+KMXzMbXn2tIk2dAEcu/XOcptuUvizS4XeEm5/0KX3de/Vkf7/fA+ODF2GlBYk5Li92ED+4CNKlMnpA7mhaJvRvgbpXopaskMKYtC/a5zittgYlw80tadJ5QPecBAkdDDw+BO5bcglB/EU4q/m5bfhnsELWqcnTIlvmel+0mvo= 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=nGO60bmX; 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="nGO60bmX" 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=0ulQb8z1SfLY1enZwXYQIgz0Cv27HjiPwCW1cZp/d8M=; b=nGO60bmXHupbm0+oQrxQQ7l8Bn CiAyNjcUlZ1INKwO8GiKvZnKdQlOePr/K3FUN30ZdiKWuuWZ6RnXMUyKsVWq1frgfa6S+S6pwOmQz ngYwYPM2xjoEidD2+QGBNWJ1lIuDUJ6250cXtm9yTzXq5plCDJO0T51TkbW+hcUn0XsQLgETSIdJ0 ToZM9fVXZ0wgurFBksAOk4hw0dzyUbzppeWsC8LQI5eX779DipPbX+Rh5Q8DnODSrPd5ZLDB/7A+c q4EB+BfkFbjqXP7ATLFNW5YU1kf0keIl2pVDuQnMx0dZ2oiPUNiYBWMJTEUzFdvGIYABTm6+sxRvU hrp6jzTA==; Received: from [2a07:aa00:8c:e0:4a2f:b568:d308:455f] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrEA1-0000000377y-3mue; Tue, 04 Aug 2026 12:22:22 +0000 Message-ID: Subject: Re: [PATCH v2 01/20] locking/rt: Use raw_spin_lock_irqsave() in __rwbase_read_unlock() From: David Woodhouse To: Sebastian Andrzej Siewior , Simona Vetter , Michal Hocko , David Rientjes , Shakeel Butt Cc: Paolo Bonzini , Sean Christopherson , Peter Zijlstra , Paul Durrant , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+208f7f3e5f59c11aeb90@syzkaller.appspotmail.com, Carsten Stollmaier Date: Tue, 04 Aug 2026 14:22:17 +0200 In-Reply-To: <20260601144724.ARQR8tYh@linutronix.de> References: <20260529201335.GP3493090@noisy.programming.kicks-ass.net> <20260529203841.GC3568911@noisy.programming.kicks-ass.net> <1c3b224f-2780-4347-b72b-783586a9b0e1@redhat.com> <58d17a623c1c5c9c09bd91baa30510aaf42f899b.camel@infradead.org> <14442dbf1e6d758fdd4756f2ed5c8cb2738582fb.camel@infradead.org> <787aa26cf62dfd361eea8ed19f384fc517892501.camel@infradead.org> <20260601134008.rllwJtn-@linutronix.de> <20260601144724.ARQR8tYh@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-D7hmmCdEfsb/rska9K02" 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 --=-D7hmmCdEfsb/rska9K02 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-06-01 at 16:47 +0200, Sebastian Andrzej Siewior wrote: > On 2026-06-01 14:53:14 [+0100], David Woodhouse wrote: > > On Mon, 2026-06-01 at 15:40 +0200, Sebastian Andrzej Siewior wrote: > > >=20 > > > Okay. This complains about non_block: > > >=20 > > > =E2=80=A6 > > > > [=C2=A0 429.927260] KVM: non-blockable invalidate_range_start, non_= block_count=3D1 > > >=20 > > > and commit 312364f3534cc ("kernel.h: Add non_block_start/end()") says > > >=20 > > > > =C2=A0=C2=A0=C2=A0 Peter also asked whether we want to catch spinlo= cks on top, but Michal > > > > =C2=A0=C2=A0=C2=A0 said those are less of a problem because spinloc= ks can't have an indirect > > > > =C2=A0=C2=A0=C2=A0 dependency upon the page allocator and hence clo= se the loop with the oom > > > > =C2=A0=C2=A0=C2=A0 reaper. > > >=20 > > > so a lock which becomes sleep-able on RT vs !RT shouldn't be a proble= m, > > > right? We also don't complain about about scheduling within a > > > rcu_read_lock() section if it is part of spin_lock(). > >=20 > > Right. This is just a false positive in the debugging check, AFAICT. > >=20 > > It's actually *fine* to take a spinlock or rwlock in the OOM reaper > > path, *even* if RT makes them in sleepable locks. And I think even the > > KVM_REQUEST_WAIT IPI is fine. > >=20 > > But to fix the false positive warning, *either*: > >=20 > > =C2=A0=E2=80=A2 non_block_start() shouldn't complain about "sleepable o= nly in RT" locks, > >=20 > > OR=20 > >=20 > > =C2=A0=E2=80=A2 The OOM reaper path shouldn't use non_block_start() und= er RT. >=20 > Looking at the list of users it was probably introduced for the mm > folks. Let me add this to my list of things to look at=E2=80=A6 I'm leaning toward the second of the two options above: the OOM reaper path shouldn't use non_block_start() under RT. Effectively reverting commit ba170f76b69d1. Mostly because I want to have an RCU grace period in there, and *that* would splat too, for no good reason that I can see. --=-D7hmmCdEfsb/rska9K02 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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