Re: [PATCH v3 5/5] lib: kunit_iov_iter: Add tests for extract_iter_to_sg

[David Gow <david@davidgow.net>]

Le 27/03/2026 à 05:49, Christian A. Ehrhardt a écrit :
> 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.
> 
> Cc: David Howells <dhowells@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
> ---

Hmm... this is failing on powerpc, where PAGE_SIZE is 64k:

[13:20:40] # iov_kunit_iter_to_sg_kvec: ASSERTION FAILED at 
lib/tests/kunit_iov_iter.c:1084
[13:20:40] Expected tail < bufsize, but
[13:20:40]     tail == 1048576 (0x100000)
[13:20:40]     bufsize == 1048576 (0x100000)
[13:20:40] [FAILED] iov_kunit_iter_to_sg_kvec
[13:20:40] # iov_kunit_iter_to_sg_bvec: ASSERTION FAILED at 
lib/tests/kunit_iov_iter.c:1084
[13:20:40] Expected tail < bufsize, but
[13:20:40]     tail == 1048576 (0x100000)
[13:20:40]     bufsize == 1048576 (0x100000)
[13:20:40] [FAILED] iov_kunit_iter_to_sg_bvec
[13:20:40] # iov_kunit_iter_to_sg_folioq: ASSERTION FAILED at 
lib/tests/kunit_iov_iter.c:1084
[13:20:40] Expected tail < bufsize, but
[13:20:40]     tail == 1048576 (0x100000)
[13:20:40]     bufsize == 1048576 (0x100000)
[13:20:40] [FAILED] iov_kunit_iter_to_sg_folioq
[13:20:40] # iov_kunit_iter_to_sg_xarray: ASSERTION FAILED at 
lib/tests/kunit_iov_iter.c:1084
[13:20:40] Expected tail < bufsize, but
[13:20:40]     tail == 1048576 (0x100000)
[13:20:40]     bufsize == 1048576 (0x100000)
[13:20:40] [FAILED] iov_kunit_iter_to_sg_xarray
[13:20:40] # iov_kunit_iter_to_sg_ubuf: ASSERTION FAILED at 
lib/tests/kunit_iov_iter.c:1084
[13:20:40] Expected tail < bufsize, but
[13:20:40]     tail == 1048576 (0x100000)
[13:20:40]     bufsize == 1048576 (0x100000)
[13:20:40] [FAILED] iov_kunit_iter_to_sg_ubuf
[13:20:40]     # module: kunit_iov_iter
[13:20:40] # iov_iter: pass:12 fail:5 skip:0 total:17
[13:20:40] # Totals: pass:12 fail:5 skip:0 total:17

Any chance we could bump up the buffer size (at least) on systems with 
larger PAGE_SIZE?

Cheers,
-- David