From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BAA1606A8BF for ; Thu, 12 Nov 2026 11:30:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=No7PT5qC; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=A1rEevOg DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date: Content-Transfer-Encoding:Content-Type:References:In-Reply-To:Cc:To:Subject: From:Message-ID:MIME-Version:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=HqMXct5PEV6biJSL+up+Q5a/LP0cl+Qu44P49RwE4SI=; b=No7PT5qC6/1btA8kSeL9EWTCwF RRFuag1P7rhOBCyyAB9PQjhP2N/DmS/T8hfrckGykcM34Xa17plX0FL279BsrActV6G+xmDRoAM9t fkymuiEBSZaQw8C284S16MP+MkCoe8LHNSXAB8TcWM20OS8i89Gda8/tt4BGbjzRUxv5D/yPpmfyV qyxOnsnXb9HFJAu4MzShy21glZffMXAmaIgYnL38ypQLARMh7gGZrGSq2jCZF9DEHT1UYRcyxI14k UappdZKQ1efXw56UzoMfiH4trgo0QxApJ+H7OLNc9QAIf1YPCjYyNMm4QKDOYBLflUBh71cTVHb1Z vN+lELcg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xRT0x-00000009jBL-3MoR; Thu, 12 Nov 2026 11:30:47 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xRT0u-00000009jAi-2A51 for kexec@lists.infradead.org; Thu, 12 Nov 2026 11:30:44 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id CBE2447A1B; Thu, 12 Nov 2026 11:30:43 +0000 (UTC) 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 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-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Sender: "kexec" X-Spam-Status: No, score=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: > 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