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lst.de; dkim=none (message not signed) header.d=none;lst.de; dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.112.34 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.112.34; helo=mail.nvidia.com; Received: from mail.nvidia.com (216.228.112.34) by CO1NAM11FT055.mail.protection.outlook.com (10.13.175.129) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4087.27 via Frontend Transport; Mon, 3 May 2021 18:23:44 +0000 Received: from [10.2.50.162] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 3 May 2021 18:23:43 +0000 Subject: Re: [PATCH 01/16] PCI/P2PDMA: Pass gfp_mask flags to upstream_bridge_distance_warn() To: Logan Gunthorpe , , , , , , References: <20210408170123.8788-1-logang@deltatee.com> <20210408170123.8788-2-logang@deltatee.com> <8ea5b5b3-e10f-121a-bd2a-07db83c6da01@deltatee.com> <3bced3a4-b826-46ab-3d98-d2dc6871bfe1@nvidia.com> <8402ca0b-f147-fb99-bab4-71f047d2ba46@deltatee.com> From: John Hubbard Message-ID: Date: Mon, 3 May 2021 11:23:43 -0700 User-Agent: Mozilla/5.0 (X11; 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charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 5/3/21 11:20 AM, Logan Gunthorpe wrote: ... >> That's the thing: memory failure should be exceedingly rare for this. >> Therefore, just fail out entirely (which I don't expect we'll likely >> ever see), instead of doing all this weird stuff to try to continue >> on if you cannot allocate a single page. If you are in that case, the >> system is not in a state that is going to run your dma p2p setup well >> anyway. >> >> I think it's *less* complexity to allocate up front, fail early if >> allocation fails, and then not have to deal with these really odd >> quirks at the lower levels. >> > > I don't see how it's all that weird. We're skipping a warning if we > can't allocate memory to calculate part of the message. It's really not > necessary. If the memory really can't be allocated then something else > will fail, but we really don't need to fail here because we couldn't > print a verbose warning message. > Well, I really dislike the result we have in this particular patch, but I won't stand in the way of progress if that's how you really are going to do it. thanks, -- John Hubbard NVIDIA _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu