From: David Rientjes via iommu <iommu@lists.linux-foundation.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2] dma-pool: Fix too large DMA pools on medium systems
Date: Mon, 8 Jun 2020 14:04:16 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2006081403560.71460@chino.kir.corp.google.com> (raw)
In-Reply-To: <20200608132217.29945-1-geert@linux-m68k.org>
On Mon, 8 Jun 2020, Geert Uytterhoeven wrote:
> On systems with at least 32 MiB, but less than 32 GiB of RAM, the DMA
> memory pools are much larger than intended (e.g. 2 MiB instead of 128
> KiB on a 256 MiB system).
>
> Fix this by correcting the calculation of the number of GiBs of RAM in
> the system. Invert the order of the min/max operations, to keep on
> calculating in pages until the last step, which aids readability.
>
> Fixes: 1d659236fb43c4d2 ("dma-pool: scale the default DMA coherent pool size with memory capacity")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This works as well and is much more readable. Thanks Geert!
Acked-by: David Rientjes <rientjes@google.com>
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next prev parent reply other threads:[~2020-06-08 21:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 13:22 [PATCH v2] dma-pool: Fix too large DMA pools on medium systems Geert Uytterhoeven
2020-06-08 21:04 ` David Rientjes via iommu [this message]
2020-06-09 13:26 ` Christoph Hellwig
2020-06-20 20:09 ` Guenter Roeck
2020-06-21 8:35 ` Geert Uytterhoeven
2020-06-21 13:11 ` Guenter Roeck
2020-06-21 20:20 ` David Rientjes via iommu
2020-06-22 16:07 ` Robin Murphy
2020-06-22 17:31 ` Christoph Hellwig
2020-06-24 7:38 ` Christoph Hellwig
2020-06-24 16:20 ` Guenter Roeck
2020-06-27 16:13 ` Marion & Christophe JAILLET
2020-06-29 8:12 ` Christoph Hellwig
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