linux-kernel - barriers vs I/O and DMA for ia64

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Message-Id: <20180731172031.4447-1-hch@lst.de>
Date:   Tue, 31 Jul 2018 19:20:30 +0200
From:   Christoph Hellwig <hch@....de>
To:     Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>
Cc:     Sinan Kaya <okaya@...eaurora.org>, Arnd Bergmann <arnd@...db.de>,
        linux-ia64@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: barriers vs I/O and DMA for ia64

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.