Messages in this thread | | | Date | Mon, 5 Nov 2018 06:58:47 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH] iommu/dma: Zero pages manually in a length of scatterlist |
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On Fri, Nov 02, 2018 at 04:36:13PM -0700, Nicolin Chen wrote: > > What if the pages came from highmem? I know that doesn't happen on arm64 > > today, but the point of this code *is* to be generic, and other users will > > arrive eventually. > > Hmm, so it probably should use sg_miter_start/stop() too? Looking > at the flush routine doing in PAGE_SIZE for each iteration, would > be possible to map and memset contiguous pages together? Actually > the flush routine might be also optimized if we can map contiguous > pages.
FYI, I have patches I plan to submit soon that gets rid of the struct scatterlist use in this code to simplify it:
http://git.infradead.org/users/hch/misc.git/commitdiff/84e837fc3248b513f73adde49e04e7c58f605113
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