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bitmap: test bitmap_weight() for more

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Test the function for correctness when some bits are set in the last word
of bitmap beyond nbits. This is motivated by commit a9dadc1c51
("powerpc/xive: Fix the size of the cpumask used in
xive_find_target_in_mask()").

Signed-off-by: Yury Norov <ynorov@nvidia.com>
This commit is contained in:
Yury Norov
2026-03-18 20:43:46 -04:00
parent f3e9c1138e
commit e9cf8f83c9
1 changed files with 19 additions and 0 deletions
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19
lib/test_bitmap.c
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@@ -858,6 +858,7 @@ static void __init test_bitmap_weight(void)
{
unsigned int bit, w1, w2, w;
DECLARE_BITMAP(b, 30);
DECLARE_BITMAP(b1, 128);
bitmap_parselist("all:1/2", b, 30);
@@ -877,6 +878,24 @@ static void __init test_bitmap_weight(void)
w2 = bitmap_weight_from(exp1, bit, EXP1_IN_BITS);
expect_eq_uint(w1 + w2, w);
}
/* Test out-of-range */
w = bitmap_weight_from(b, 31, 30);
expect_eq_uint(0, !!(w < 30));
/*
* Test bitmap_weight() for correctness in case of some bits set between
* nbits and end of the last word.
*/
bitmap_fill(b1, 128);
/* Inline */
expect_eq_uint(30, bitmap_weight(b1, 30));
expect_eq_uint(100, bitmap_weight(b1, 100));
/* Outline */
for (int i = 1; i < 128; i++)
expect_eq_uint(i, bitmap_weight(b1, i));
}
static void __init test_for_each_clear_bit(void)