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Date: Wed, 13 May 2015 16:42:26 +0800 From: Dave Young <dyoung@...hat.com> To: "Li, ZhenHua" <zhen-hual@...com> Cc: dwmw2@...radead.org, indou.takao@...fujitsu.com, bhe@...hat.com, joro@...tes.org, vgoyal@...hat.com, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, kexec@...ts.infradead.org, alex.williamson@...hat.com, ddutile@...hat.com, ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com, doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com, li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com, rwright@...com Subject: Re: [PATCH v11 02/10] iommu/vt-d: Items required for kdump On 05/13/15 at 09:45am, Li, ZhenHua wrote: > On 05/12/2015 04:17 PM, Dave Young wrote: > >On 05/11/15 at 05:52pm, Li, Zhen-Hua wrote: > >>Add context entry functions needed for kdump. > >>+/* > >>+ * Fix Crashdump failure caused by leftover DMA through a hardware IOMMU > >>+ * > >>+ * Fixes the crashdump kernel to deal with an active iommu and legacy > >>+ * DMA from the (old) panicked kernel in a manner similar to how legacy > >>+ * DMA is handled when no hardware iommu was in use by the old kernel -- > >>+ * allow the legacy DMA to continue into its current buffers. > >>+ * > >>+ * In the crashdump kernel, this code: > >>+ * 1. skips disabling the IOMMU's translating. > >>+ * 2. Do not re-enable IOMMU's translating. > >>+ * 3. In kdump kernel, use the old root entry table. > >>+ * 4. Allocate pages for new context entry, copy data from old context entries > >>+ * in the old kernel to the new ones. > >>+ * > >>+ * In other kinds of kernel, for example, a kernel started by kexec, > >>+ * do the same thing as crashdump kernel. > >>+ */ > >>+ > >>+ > > > >Above comments should come along with the code changes instead of putting it > >in this patch. > > > >BTW, there's one more blank line at the end.. > Code change is in 00/10, the cover letter. I means the real code, not the changelog. > And the blank does not matter, I checked the patch with > scripts/checkpatch.pl, no warnings, no errors. Why add two line breaks if one is enough? Adding such check in checkpatch.pl make sense to me actually. Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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