From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794483043; b=lmJdy/ZlEay0dJOfndwzExqtDGvMcXg/YdMdcAN8kDnXPuW3Tvj6HCHcnD/ix0lNJx/0 TcKVT2a0dE6S1aF4gA5kBaMQqVXnfRRYxyYqtynoJ8aq7Mn3A7VMdSxO7/nzqPH+MTj2q R/XnFzytibnFaSxYCapWrFNC0dJQBHY4erQix37PDFltEMMNpBR/pqdNLQ+9ikxYg5+qM r/3kxS9zfL5/tb4JXXfowQRORWPFXg5xvjEs+a5sXp38xgP9/M8M2UdbxeSQaz+5gzmCH 2ATPQZ5YJMKCntf264Iyw9uT/6H5pltNf7OzlGhhNegdFRZl+8ZfZSRzwCkmKtaYZ3w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794483043; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=HqMXct5PEV6biJSL+up+Q5a/LP0cl+Qu44P49RwE4SI=; b=LG6S1TkRuf8cck5JOWXbAjJeni6nzfF+IsBA3OXEMHiR8muro0ABBMu6Jv7UyxaEhH+z tUtdliSUY+dpPHv9gpNxjM945QHfE/ajj5cfUBZJ/sFfFe5LllJi8cYbLuKyILbYuP0pY h/Tg80wxymW12PXpMQaGD4ugwU6nbJ+LvPxyo/oivGG8N6PO/ZQz9TYy6NfIudgeawfzY ACJ7h6m+Iiydl0r/UgXqHvGFvPoIecUex1zdES2heBLjvfpK35HzOPZ7XztRcQCevPSdw ggi9332msd2WnEGjr3Cqq88quVcJSDnO88OpfV6YggvaNkYipW80idxOijWWre3A5WQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=A1rEevOg; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D518C606A323 for ; Thu, 12 Nov 2026 11:30:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=A1rEevOg Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23BD51F00A06; Thu, 12 Nov 2026 11:30:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794483043; bh=HqMXct5PEV6biJSL+up+Q5a/LP0cl+Qu44P49RwE4SI=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=A1rEevOg5JKxJ7L23C//RbmcPanr5CdRQSIJIMowEqwo9dkPnJ6IO/FDAFrocC5IM ycmZW7y+hHdkSYx728Qt6I4XWAJnaoRYoMmb7SfplelzOozah3KLQahlvGMt3zma8f AFgzFluQCDb3lo9VoMg4H0mVFp7baMbUJW3C0qBdkDmUxmK7veoK1fT5TQCdgFgukX 38FWT7o4kIRf+F9a6Yb8sJnkmEhHR6LSCgPW/ys47YQn05Hqo0i+7TvkqxiacpQH4p wBjL7q/iECIsU3Zr9R7BcSXmb4dLr63tDblsKVicpbqM3hfPtqqbXQ+L9UhgXyBEam laP9Sco+Kh5Ig== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v1 7/8] s390/kdump: Skip the crashkernel CMA DMA wait Reply-To: sashiko-reviews@lists.linux.dev To: "Mikhail Zaslonko" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" Cc: "Ilya Leoshkevich" , "Andrew Morton" , "Baoquan He" , "Mike Rapoport" , "Pasha Tatashin" , "Pratyush Yadav" , "Dave Young" , "Jiri Bohac" , "Jonathan Corbet" , "Usama Arif" , linux-s390@vger.kernel.org, kexec@lists.infradead.org, "Christian Borntraeger" In-Reply-To: <20261112112105.1169118-8-zaslonko@linux.ibm.com> References: <20261112112105.1169118-1-zaslonko@linux.ibm.com> <20261112112105.1169118-8-zaslonko@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 12 Nov 2026 11:30:42 +0000 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > With a crashkernel CMA reservation, __crash_kexec() waits 10 seconds > before starting the kdump kernel, so that pending DMA into the CMA > memory can finish. >=20 > s390 does not need this: before it jumps to the kdump kernel, > s390_reset_system() issues diag 308 subcode 1, which terminates all > in-flight I/O. >=20 > Let architectures override the timeout and set it to 0 on s390. >=20 > Signed-off-by: Mikhail Zaslonko Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261112112105.1169= 118-1-zaslonko@linux.ibm.com?part=3D7