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bitmap: Properly initialise destination bitmap for scatter & gather test

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Erhard reports failure of bitmap tests on powerpc:

  test_bitmap: loaded.
  test_bitmap: [lib/test_bitmap.c:397] bitmaps contents differ: expected "1,3-4,9", got "1,3-4,9,65-71,73-79,81-87,89-95,97-99"
  test_bitmap: parselist('0-2047:128/256'):    912
  test_bitmap: scnprintf("%*pbl", '0-32767'):    5977
  test_bitmap: test_bitmap_read_perf:        1191082
  test_bitmap: test_bitmap_write_perf:        1270153
  test_bitmap: failed 1 out of 208655 tests

It happens mainly when CONFIG_INIT_STACK_ALL_PATTERN is set.

Commit 6b5a4b6873 ("bitmap: Add test for out-of-boundary
modifications for scatter & gather") extended the test to
out-of-boundary bits, but those bits were left uninitialised.

Properly initialise the entire result bitmap before the test.

[Yury: minor commit message tweaks]

Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Closes: https://lore.kernel.org/all/ca3547ae-8b79-43a2-a758-23ec980bfd9a@mailbox.org
Fixes: 6b5a4b6873 ("bitmap: Add test for out-of-boundary modifications for scatter & gather")
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <ynorov@nvidia.com>
This commit is contained in:
Christophe Leroy (CS GROUP)
2026-07-09 13:40:06 +02:00
committed by Yury Norov
parent be9eae3e83
commit 36f78b0dfa
1 changed files with 1 additions and 0 deletions
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1
lib/test_bitmap.c
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@@ -429,6 +429,7 @@ static void __init test_bitmap_sg(void)
/* Scatter/gather relationship */
bitmap_zero(bmap_tmp, 100);
bitmap_zero(bmap_res, 100);
bitmap_gather(bmap_tmp, bmap_scatter, sg_mask, nbits);
bitmap_scatter(bmap_res, bmap_tmp, sg_mask, nbits);
expect_eq_bitmap(bmap_scatter, bmap_res, 100);