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lib/test_bitmap.c: add test for bitmap_cut() 

Inspired by an original patch from Yury Norov: introduce a test for
bitmap_cut() that also makes sure functionality is as described for
partially overlapping src and dst.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Yury Norov <yury.norov@gmail.com>
Link: http://lkml.kernel.org/r/5fc45e6bbd4fa837cd9577f8a0c1d639df90a4ce.1592155364.git.sbrivio@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefano Brivio 2020-08-11 18:34:32 -07:00 committed by Linus Torvalds
parent 5959f829a9
commit bcb32a1d82
1 changed files with 58 additions and 0 deletions
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58
lib/test_bitmap.c
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@ -610,6 +610,63 @@ static void __init test_for_each_set_clump8(void)
expect_eq_clump8(start, CLUMP_EXP_NUMBITS, clump_exp, &clump);
}
struct test_bitmap_cut {
unsigned int first;
unsigned int cut;
unsigned int nbits;
unsigned long in[4];
unsigned long expected[4];
};
static struct test_bitmap_cut test_cut[] = {
{ 0, 0, 8, { 0x0000000aUL, }, { 0x0000000aUL, }, },
{ 0, 0, 32, { 0xdadadeadUL, }, { 0xdadadeadUL, }, },
{ 0, 3, 8, { 0x000000aaUL, }, { 0x00000015UL, }, },
{ 3, 3, 8, { 0x000000aaUL, }, { 0x00000012UL, }, },
{ 0, 1, 32, { 0xa5a5a5a5UL, }, { 0x52d2d2d2UL, }, },
{ 0, 8, 32, { 0xdeadc0deUL, }, { 0x00deadc0UL, }, },
{ 1, 1, 32, { 0x5a5a5a5aUL, }, { 0x2d2d2d2cUL, }, },
{ 0, 15, 32, { 0xa5a5a5a5UL, }, { 0x00014b4bUL, }, },
{ 0, 16, 32, { 0xa5a5a5a5UL, }, { 0x0000a5a5UL, }, },
{ 15, 15, 32, { 0xa5a5a5a5UL, }, { 0x000125a5UL, }, },
{ 15, 16, 32, { 0xa5a5a5a5UL, }, { 0x0000a5a5UL, }, },
{ 16, 15, 32, { 0xa5a5a5a5UL, }, { 0x0001a5a5UL, }, },
{ BITS_PER_LONG, BITS_PER_LONG, BITS_PER_LONG,
{ 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
{ 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
},
{ 1, BITS_PER_LONG - 1, BITS_PER_LONG,
{ 0xa5a5a5a5UL, 0xa5a5a5a5UL, },
{ 0x00000001UL, 0x00000001UL, },
},
{ 0, BITS_PER_LONG * 2, BITS_PER_LONG * 2 + 1,
{ 0xa5a5a5a5UL, 0x00000001UL, 0x00000001UL, 0x00000001UL },
{ 0x00000001UL, },
},
{ 16, BITS_PER_LONG * 2 + 1, BITS_PER_LONG * 2 + 1 + 16,
{ 0x0000ffffUL, 0x5a5a5a5aUL, 0x5a5a5a5aUL, 0x5a5a5a5aUL },
{ 0x2d2dffffUL, },
},
};
static void __init test_bitmap_cut(void)
{
unsigned long b[5], *in = &b[1], *out = &b[0]; /* Partial overlap */
int i;
for (i = 0; i < ARRAY_SIZE(test_cut); i++) {
struct test_bitmap_cut *t = &test_cut[i];
memcpy(in, t->in, sizeof(t->in));
bitmap_cut(out, in, t->first, t->cut, t->nbits);
expect_eq_bitmap(t->expected, out, t->nbits);
}
}
static void __init selftest(void)
{
test_zero_clear();
@ -623,6 +680,7 @@ static void __init selftest(void)
test_bitmap_parselist_user();
test_mem_optimisations();
test_for_each_set_clump8();
test_bitmap_cut();
}
KSTM_MODULE_LOADERS(test_bitmap);