linux-kernel - Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again

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Message-Id: <20070102.162058.55482337.davem@davemloft.net>
Date:	Tue, 02 Jan 2007 16:20:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	James.Bottomley@...elEye.com
Cc:	rmk+lkml@....linux.org.uk, miklos@...redi.hu, arjan@...radead.org,
	torvalds@...l.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, akpm@...l.org
Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all
 that again

From: James Bottomley <James.Bottomley@...elEye.com>
Date: Tue, 02 Jan 2007 17:34:18 -0600

> Erm ... for a device driver, if we're preparing to do I/O on the page
> something must have made the user caches coherent ... that can't be
> kmap, because the driver might elect to DMA on the page ... unless
> another component of this API is going to be to make dma_map_... also
> flush the user cache?

The DMA map/unmap/sync performs the necessary cache flushes.
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