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Subject: Re: [PATCH v2 6/9] dmapool: improve scalability of dma_pool_free
References: <eabf88b3-c40f-9973-efed-30af46f42c8d@cybernetics.com>
From: Tony Battersby <tonyb@cybernetics.com>
Message-ID: <fee77a48-a86b-75eb-7648-6e6e13c3e8e8@cybernetics.com>
Date: Fri, 3 Aug 2018 16:05:35 -0400
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To: Matthew Wilcox <willy@infradead.org>, Christoph Hellwig <hch@lst.de>, Marek Szyprowski <m.szyprowski@samsung.com>, Sathya Prakash <sathya.prakash@broadcom.com>, Chaitra P B <chaitra.basappa@broadcom.com>, Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>, iommu@lists.linux-foundation.org, linux-mm@kvack.org, linux-scsi@vger.kernel.org, MPT-FusionLinux.pdl@broadcom.com

For v3 of the patchset, I was also considering to add a note to the
kernel-doc comments for dma_pool_create() to use dma_alloc_coherent()
directly instead of a dma pool if the driver intends to allow userspace
to mmap() the returned pages, due to the new use of the _mapcount union
in struct page.A  Would you consider that useful information or pointless
trivia?