On Wednesday, 1 February 2023 02:52:13 CET Dr. David Alan Gilbert wrote: > bisected: > GOOD [37fcacb50be7071d146144a6c5c5bf0194b9a1cf] phy: PHY_FSL_LYNX_28G should > depend on ARCH_LAYERSCAPE BAD [f5ff79fddf0efecca538046b5cc20fb3ded2ec4f] > dma-mapping: remove CONFIG_DMA_REMAP GOOD > [e62c17f0455a74b182ce6373e2777817256afaa1] MAINTAINERS: update maintainer > list of DMA MAPPING BENCHMARK GOOD > [0fb3436b4b36cf69f4544385aa2bb8c5a4913509] sparc: Remove usage of the > deprecated "pci-dma-compat.h" API GOOD > [fba09099c6e506608e05e08ac717bf34501f821b] media: v4l2-pci-skeleton: Remove > usage of the deprecated "pci-dma-compat.h" API > > dg@major:~/kernel/kernel-clone$ git bisect good > f5ff79fddf0efecca538046b5cc20fb3ded2ec4f is the first bad commit > commit f5ff79fddf0efecca538046b5cc20fb3ded2ec4f > Author: Christoph Hellwig <hch@lst.de> > Date: Sat Feb 26 16:40:21 2022 +0100 > > dma-mapping: remove CONFIG_DMA_REMAP > > That sounds like a believable cause given that it's IOMMU related > and device related. Thanks for that thorough analyses! If you're 'penguin42' on IRC, then I'd suggest to present your findings to iommu@lists.linux.dev as both the author and the reviewer are highly likely subscribed to that list. scripts/get_maintainer.pl drivers/iommu/dma-iommu.c scripts/get_maintainer.pl kernel/dma/Makefile list them both and both results have also that ML in their result. HTH
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