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Date: Mon, 28 May 2018 08:07:57 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Christoph Hellwig <hch@....de> cc: Ingo Molnar <mingo@...hat.com>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, x86@...nel.org, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH 5/7] x86: remove the experimental forcesac boot option On Fri, 25 May 2018, Christoph Hellwig wrote: x86/pci-dma: ... Please > Limiting the dma mask to avoid PCI (pre-PCIe) DAC cycles while paying > the huge overhead of an IOMMU is rather pointless, and this seriously > gets in the way of dma mapping work. > > Signed-off-by: Christoph Hellwig <hch@....de> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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