Re: [PATCH 1/7] ubi: block: Refactor sg list processing for highmem

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Von: "Christoph Hellwig" hch@infradead.org On Thu, Aug 10, 2023 at 09:54:46PM +0200, Richard Weinberger wrote:

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But why add the bounce buffering first if you can avoid it from the very beginning by just using kmap_local instead of adding a new caller for the deprecate kmap_atomic?

Because I want this fix also in all stable trees. kmap_local() is rather new. When back porting patch 1/7, bounce buffers and kmap_atomic() are needed anyway. By doing this in patch 1/7 I avoid backport troubles and keep the delta between upstream and stable trees minimal.

Just use plain kmap for the historic backports.

Hm, yes. For UBIblock kmap should be too expensive.

Thanks, //richard