From: David Woodhouse <dwmw2@infradead.org>
To: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>, Yinghai Lu <yinghai@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vinod.koul@intel.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Ashok Raj <ashok.raj@intel.com>,
Yijing Wang <wangyijing@huawei.com>,
Tony Luck <tony.luck@intel.com>,
iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org
Subject: Re: [Patch Part3 V1 19/22] iommu/vt-d: simplify intel_unmap_sg() and kill duplicated code
Date: Tue, 22 Apr 2014 08:38:53 +0100 [thread overview]
Message-ID: <1398152333.723.27.camel@shinybook.infradead.org> (raw)
In-Reply-To: <1398150453-28141-20-git-send-email-jiang.liu@linux.intel.com>
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On Tue, 2014-04-22 at 15:07 +0800, Jiang Liu wrote:
> + size_t size = 0;
> +#if 0
> + /* current the third argument of intel_unmap_page is unsued */
> + int i;
> + struct scatterlist *sg;
>
> - freelist = domain_unmap(domain, start_pfn, last_pfn);
> + for_each_sg(sglist, sg, nelems, i)
> + size += sg->length;
> +#endif
Please don't do that. If you want to rely on the fact that
intel_unmap_page() currently just uses the size from the IOVA it finds,
then split it out into a separate function which explicitly does
precisely that. And call that new function from both intel_unmap_sg()
and intel_unmap_page().
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
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next prev parent reply other threads:[~2014-04-22 7:39 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-22 7:07 [RFC Patch Part3 V1 00/22] Enable Intel DMAR device hotplug Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 01/22] iommu/vt-d: match segment number when searching for dev_iotlb capable devices Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 02/22] iommu/vt-d: use correct domain id to flush virtual machine domains Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 03/22] iommu/vt-d: introduce helper functions to improve code readability Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 04/22] iommu/vt-d: introduce helper functions to make code symmetric for readability Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 05/22] iommu/vt-d: only dynamically allocate domain id for virtual domains Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 06/22] iommu/vt-d: fix possible invalid memory access caused by free_dmar_iommu() Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 07/22] iommu/vt-d: avoid freeing virtual machine domain in free_dmar_iommu() Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 08/22] iommu/VT-d: simplify include/linux/dmar.h Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 09/22] iommu/vt-d: change iommu_enable/disable_translation to return void Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 10/22] iommu/vt-d: dynamically allocate and free seq_id for DMAR units Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 11/22] IOMMU/vt-d: introduce helper function dmar_walk_resources() Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 12/22] iommu/vt-d: implement DMAR unit hotplug framework Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 13/22] iommu/vt-d: search _DSM method for DMAR hotplug Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 14/22] iommu/vt-d: enhance intel_irq_remapping driver to support DMAR unit hotplug Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 15/22] iommu/vt-d: enhance error recovery in function intel_enable_irq_remapping() Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 16/22] iommu/vt-d: enhance intel-iommu driver to support DMAR unit hotplug Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 17/22] pci, ACPI, iommu: enhance pci_root to support DMAR device hotplug Jiang Liu
2014-04-22 9:49 ` Rafael J. Wysocki
2014-05-05 8:31 ` Jiang Liu
2014-04-24 17:33 ` Bjorn Helgaas
2014-05-05 8:22 ` Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 18/22] iommu/vt-d: update proximity information when a new node with memory available Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 19/22] iommu/vt-d: simplify intel_unmap_sg() and kill duplicated code Jiang Liu
2014-04-22 7:38 ` David Woodhouse [this message]
2014-04-22 7:42 ` Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 20/22] iommu/vt-d: introduce helper domain_pfn_within_range() to simplify code Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 21/22] iommu/vt-d: introduce helper function iova_size() to improve code readability Jiang Liu
2014-04-22 7:07 ` [Patch Part3 V1 22/22] iommu/vt-d: fix bug in computing domain's iommu_snooping flag Jiang Liu
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