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0913b75547
Add test cases that test extract_iter_to_sg. For each iterator type an iterator is loaded with a suitable buffer. The iterator is then extracted to a scatterlist with multiple calls to extract_iter_to_sg. The final scatterlist is copied into a scratch buffer. The test passes if the scratch buffer contains the same data as the original buffer. The new tests demonstrate bugs in extract_iter_to_sg for kvec and user iterators that are fixed by the previous commits. Link: https://lkml.kernel.org/r/20260326214905.818170-6-lk@c--e.de Signed-off-by: Christian A. Ehrhardt <lk@c--e.de> Cc: David Howells <dhowells@redhat.com> Cc: David Gow <davidgow@google.com> Cc: Kees Cook <kees@kernel.org> Cc: Petr Mladek <pmladek@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>