From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: bounce limit in mmc?
Date: Mon, 28 Aug 2017 10:48:08 -0700
Message-ID: <20170828174808.GA8384@infradead.org>
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Hi all, any idea why the mmc driver defaults to bouncing highmem
pages if the device doesn't have a DMA mask?  highmem is defined
different on different architectures or even based on config options,
so it seems like a very odd choice.