From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Joerg Roedel <joro@8bytes.org>
Cc: linux-arch@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-parisc@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
jdmason@kudzu.us, the arch/x86 maintainers <x86@kernel.org>,
Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
iommu@lists.linux-foundation.org, linux-alpha@vger.kernel.org,
xen-devel@lists.xenproject.org,
David Woodhouse <dwmw2@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: remove the ->mapping_error method from dma_map_ops V2
Date: Fri, 23 Nov 2018 11:01:55 +0000 [thread overview]
Message-ID: <20181123110155.GR30658__15780.3617687479$1542970866$gmane$org@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20181123104918.GE1586@8bytes.org>
On Fri, Nov 23, 2018 at 11:49:18AM +0100, Joerg Roedel wrote:
> On Thu, Nov 22, 2018 at 05:52:15PM +0000, Robin Murphy wrote:
> > Unfortunately, with things like the top-down IOVA allocator, and 32-bit
> > systems in general, "the top 4095" values may well still be valid addresses
> > - we're relying on a 1-byte mapping of the very top byte of memory/IOVA
> > space being sufficiently ridiculous that no real code would ever do that,
> > but even a 4-byte mapping of the top 4 bytes is within the realms of the
> > plausible (I've definitely seen the USB layer make 8-byte mappings from any
> > old offset within a page, for example).
>
> But we can easily work around that by reserving the top 4k of the first
> 4GB of IOVA address space in the allocator, no? Then these values are
> never returned as valid DMA handles.
Yuck. So, if we have a 4GB non-PAE 32-bit system, or a PAE system
where we have valid memory across the 4GB boundary and no IOMMU,
we have to reserve the top 4K page in the first 4GB of RAM?
Linus' IS_DMA_ERR() solution is way more preferable, but unfortunately
it still falls short, because it knocks out the top 4K of every DMA
capable bus.
A DMA capable bus may involve some translation of the address (eg, by
simple offsetting) which means that we'd need to potentially knock out
multiple pages from the page allocator for each of those pages that
correspond to the top 4K of any DMA capable bus. Knowing that at the
right time at boot will be fun! It also sounds wasteful to me.
Rather than inventing magic cookies like this, I'd much rather we
sanitised the API so that we have functions that return success or
an error code, rather than trying to shoe-horn some kind of magic
error codes into dma_addr_t and subtly break systems in the process.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2018-11-23 11:02 UTC|newest]
Thread overview: 343+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-22 14:02 remove the ->mapping_error method from dma_map_ops V2 Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 01/24] dma-direct: Make DIRECT_MAPPING_ERROR viable for SWIOTLB Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 02/24] swiotlb: Skip cache maintenance on map error Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` [PATCH 03/24] dma-mapping: provide a generic DMA_MAPPING_ERROR Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:02 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 04/24] dma-direct: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 05/24] arm: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 06/24] powerpc/iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 07/24] mips/jazz: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 08/24] s390: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 09/24] sparc: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 10/24] parisc/ccio: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 11/24] parisc/sba_iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 12/24] arm64: remove the dummy_dma_ops mapping_error method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 13/24] alpha: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 14/24] ia64/sba_iommu: improve internal map_page users Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 15/24] ia64/sba_iommu: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 16/24] ia64/sn: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 17/24] x86/amd_gart: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 18/24] x86/calgary: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 19/24] iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 20/24] iommu/intel: small map_page cleanup Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 21/24] iommu/vt-d: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 22/24] iommu/dma-iommu: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 23/24] xen-swiotlb: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` [PATCH 24/24] dma-mapping: " Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 14:03 ` Christoph Hellwig
2018-11-22 16:50 ` remove the ->mapping_error method from dma_map_ops V2 Linus Torvalds
2018-11-22 16:50 ` Linus Torvalds
2018-11-22 16:50 ` Linus Torvalds
2018-11-22 16:50 ` Linus Torvalds
2018-11-22 17:07 ` Russell King - ARM Linux
2018-11-22 17:07 ` Russell King - ARM Linux
2018-11-22 17:07 ` Russell King - ARM Linux
2018-11-22 17:09 ` Linus Torvalds
2018-11-22 17:09 ` Linus Torvalds
2018-11-22 17:09 ` Linus Torvalds
2018-11-22 17:09 ` Linus Torvalds
2018-11-22 17:09 ` Linus Torvalds
2018-11-22 17:14 ` Russell King - ARM Linux
2018-11-22 17:14 ` Russell King - ARM Linux
2018-11-22 17:14 ` Russell King - ARM Linux
2018-11-22 17:52 ` Robin Murphy
2018-11-22 17:52 ` Robin Murphy
2018-11-22 17:52 ` Robin Murphy
2018-11-22 17:55 ` Linus Torvalds
2018-11-22 17:55 ` Linus Torvalds
2018-11-22 17:55 ` Linus Torvalds
2018-11-22 17:55 ` Linus Torvalds
2018-11-22 17:55 ` Linus Torvalds
2018-11-22 18:05 ` Russell King - ARM Linux
2018-11-22 18:05 ` Russell King - ARM Linux
2018-11-22 18:05 ` Russell King - ARM Linux
2018-11-23 6:57 ` Christoph Hellwig
2018-11-23 6:57 ` Christoph Hellwig
2018-11-23 6:57 ` Christoph Hellwig
2018-11-23 6:57 ` Christoph Hellwig
2018-11-23 6:57 ` Christoph Hellwig
2018-11-23 6:55 ` Christoph Hellwig
2018-11-23 6:55 ` Christoph Hellwig
2018-11-23 6:55 ` Christoph Hellwig
2018-11-23 6:55 ` Christoph Hellwig
2018-11-28 7:41 ` Christoph Hellwig
2018-11-28 7:41 ` Christoph Hellwig
2018-11-28 7:41 ` Christoph Hellwig
2018-11-28 7:41 ` Christoph Hellwig
2018-11-28 16:47 ` Linus Torvalds
2018-11-28 16:47 ` Linus Torvalds
2018-11-28 16:47 ` Linus Torvalds
2018-11-28 16:47 ` Linus Torvalds
2018-11-28 16:47 ` Linus Torvalds
2018-11-28 17:45 ` Russell King - ARM Linux
2018-11-28 17:45 ` Russell King - ARM Linux
2018-11-28 18:00 ` Linus Torvalds
2018-11-28 18:00 ` Linus Torvalds
2018-11-28 18:00 ` Linus Torvalds
2018-11-28 18:00 ` Linus Torvalds
2018-11-28 18:08 ` Russell King - ARM Linux
2018-11-28 18:08 ` Russell King - ARM Linux
[not found] ` <20181128180841.GM30658-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org>
2018-11-28 19:19 ` Linus Torvalds
2018-11-28 19:31 ` Russell King - ARM Linux
2018-11-28 19:31 ` Russell King - ARM Linux
2018-11-28 19:31 ` Russell King - ARM Linux
2018-11-29 16:23 ` Christoph Hellwig
2018-11-29 16:23 ` Christoph Hellwig
2018-11-29 16:23 ` Christoph Hellwig
2018-11-29 16:23 ` Christoph Hellwig
2018-11-29 17:44 ` Linus Torvalds
2018-11-29 17:44 ` Linus Torvalds
2018-11-29 17:44 ` Linus Torvalds
2018-11-29 17:44 ` Linus Torvalds
2018-11-29 18:31 ` Christoph Hellwig
2018-11-29 18:31 ` Christoph Hellwig
2018-11-29 18:31 ` Christoph Hellwig
2018-11-29 18:31 ` Christoph Hellwig
2018-11-29 18:53 ` Linus Torvalds
2018-11-29 18:53 ` Linus Torvalds
2018-11-29 18:53 ` Linus Torvalds
2018-11-29 18:55 ` Christoph Hellwig
2018-11-29 18:55 ` Christoph Hellwig
2018-11-29 18:55 ` Christoph Hellwig
2018-11-29 18:55 ` Christoph Hellwig
2018-11-29 18:53 ` Linus Torvalds
2018-11-28 19:19 ` Linus Torvalds
2018-11-28 19:23 ` Russell King - ARM Linux
2018-11-28 19:23 ` Russell King - ARM Linux
2018-11-28 19:23 ` Russell King - ARM Linux
2018-11-28 18:08 ` Russell King - ARM Linux
2018-11-28 19:27 ` David Miller
2018-11-28 19:27 ` David Miller
2018-11-28 19:27 ` David Miller
2018-11-28 19:47 ` Russell King - ARM Linux
2018-11-28 19:47 ` Russell King - ARM Linux
2018-11-28 23:01 ` Shuah Khan
2018-11-28 23:01 ` Shuah Khan
2018-11-28 23:01 ` Shuah Khan
2018-11-28 23:01 ` Shuah Khan
2018-11-28 23:01 ` Shuah Khan
2018-11-28 19:47 ` Russell King - ARM Linux
2018-11-28 19:27 ` David Miller
2018-11-28 17:45 ` Russell King - ARM Linux
2018-11-23 6:55 ` Christoph Hellwig
2018-11-23 10:49 ` Joerg Roedel
2018-11-23 10:49 ` Joerg Roedel
2018-11-23 10:49 ` Joerg Roedel
2018-11-23 11:01 ` Russell King - ARM Linux
2018-11-23 11:01 ` Russell King - ARM Linux
2018-11-23 13:03 ` Joerg Roedel
2018-11-23 13:03 ` Joerg Roedel
2018-11-23 13:03 ` Joerg Roedel
2018-11-23 13:20 ` Russell King - ARM Linux
2018-11-23 13:20 ` Russell King - ARM Linux
2018-11-23 13:20 ` Russell King - ARM Linux
2018-11-23 13:20 ` Russell King - ARM Linux
2018-11-23 13:03 ` Joerg Roedel
2018-11-23 11:01 ` Russell King - ARM Linux [this message]
2018-11-23 10:49 ` Joerg Roedel
2018-11-22 14:02 Christoph Hellwig
2018-11-30 13:22 remove the ->mapping_error method from dma_map_ops V3 Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 01/23] dma-mapping: provide a generic DMA_MAPPING_ERROR Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-12-04 16:41 ` Robin Murphy
2018-12-04 16:41 ` Robin Murphy
2018-12-04 16:41 ` Robin Murphy
2018-12-04 22:33 ` Christoph Hellwig
2018-12-04 22:33 ` Christoph Hellwig
2018-12-04 22:33 ` Christoph Hellwig
2018-12-04 22:33 ` Christoph Hellwig
2018-12-04 16:41 ` Robin Murphy
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 02/23] dma-direct: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 03/23] arm: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 04/23] powerpc/iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 05/23] mips/jazz: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 06/23] s390: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 07/23] sparc: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 08/23] parisc/ccio: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 09/23] parisc/sba_iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 10/23] arm64: remove the dummy_dma_ops mapping_error method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 11/23] alpha: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 12/23] ia64/sba_iommu: improve internal map_page users Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 13/23] ia64/sba_iommu: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 14/23] ia64/sn: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 15/23] x86/amd_gart: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 16/23] x86/calgary: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 17/23] iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 18/23] iommu/intel: small map_page cleanup Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 19/23] iommu/vt-d: remove the mapping_error dma_map_ops method Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 20/23] iommu/dma-iommu: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 21/23] xen-swiotlb: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-12-02 12:42 ` Konrad Rzeszutek Wilk
2018-12-02 12:42 ` Konrad Rzeszutek Wilk
2018-12-02 12:42 ` Konrad Rzeszutek Wilk
2018-12-02 12:42 ` Konrad Rzeszutek Wilk
2018-12-02 12:42 ` Konrad Rzeszutek Wilk
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 22/23] dma-mapping: " Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` [PATCH 23/23] dma-mapping: return an error code from dma_mapping_error Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 13:22 ` Christoph Hellwig
2018-11-30 18:59 ` remove the ->mapping_error method from dma_map_ops V3 Russell King - ARM Linux
2018-11-30 18:59 ` Russell King - ARM Linux
2018-11-30 18:59 ` Russell King - ARM Linux
2018-11-30 19:43 ` Linus Torvalds
2018-11-30 19:43 ` Linus Torvalds
2018-11-30 19:43 ` Linus Torvalds
2018-11-30 19:43 ` Linus Torvalds
2018-12-03 17:27 ` Christoph Hellwig
2018-12-03 17:27 ` Christoph Hellwig
2018-12-03 17:27 ` Christoph Hellwig
2018-12-03 17:27 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
2018-12-06 14:57 ` Christoph Hellwig
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