proc "seq files": switch to ->read_iter
Implement ->read_iter for all proc "seq files" so that splice works on them. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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