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swiotlb regression fixe

To: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 11 May 2022 14:58:02 +0200
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Conor.Dooley@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 11 May 2022 12:58:25 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Hi all,

attached are a bunch of fixes for regressions in the recent swiotlb
refactoring.  The first one was reported by Conor, and the other two
are things I found by code inspections while trying to fix what he
reported.

Follow-Ups:
- [PATCH 2/3] swiotlb: use the right nslabs value in swiotlb_init_remap
  - From: Christoph Hellwig
- [PATCH 3/3] swiotlb: use the right nslabs-derived sizes in swiotlb_init_late
  - From: Christoph Hellwig
- [PATCH 1/3] swiotlb: don't panic when the swiotlb buffer can't be allocated
  - From: Christoph Hellwig

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