barriers vs I/O and DMA for ia64

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To: Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>
Subject: barriers vs I/O and DMA for ia64
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 31 Jul 2018 19:20:30 +0200
Cc: Sinan Kaya <okaya@xxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx

Hi all,

please review these patches carefully - ia64 currenly seems to be
the odd one out in terms of barrier placement for DMA and I/O and
this patch tries to resolve it.  But I don't have any IA64 hardware
nor do I know the architecture to well, so don't blindly trust me.

Follow-Ups:
- [PATCH] ia64: fix barrier placement for write* / dma mapping
  - From: Christoph Hellwig

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