netdev - Re: [PATCH 16/16] dma-mapping: use exact allocation in dma_alloc

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Date:   Fri, 14 Jun 2019 17:08:27 +0200
From:   'Christoph Hellwig' <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     'Christoph Hellwig' <hch@....de>,
        David Laight <David.Laight@...LAB.COM>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Ian Abbott <abbotti@....co.uk>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Sean Paul <sean@...rly.run>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 16/16] dma-mapping: use exact allocation in
 dma_alloc_contiguous

On Fri, Jun 14, 2019 at 04:05:33PM +0100, Robin Murphy wrote:
> That said, I don't believe this particular patch should make any 
> appreciable difference - alloc_pages_exact() is still going to give back 
> the same base address as the rounded up over-allocation would, and 
> PAGE_ALIGN()ing the size passed to get_order() already seemed to be 
> pointless.

True, we actually do get the right alignment just about anywhere.
Not 100% sure about the various static pool implementations, but we
can make sure if any didn't we'll do that right thing once those
get consolidated.