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

From: James Bottomley <[email protected]>
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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