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lib: test_mul_u64_u64_div_u64(): test the 32bit code on 64bit

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There are slight differences in the mul_u64_add_u64_div_u64() code between
32bit and 64bit systems.

Compile and test the 32bit version on 64bit hosts for better test
coverage.

Link: https://lkml.kernel.org/r/20251105201035.64043-10-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Laight
2025-11-05 20:10:35 +00:00
committed by Andrew Morton
parent d10bb374c4
commit 1d1ef8c1fb
1 changed files with 29 additions and 0 deletions
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29
lib/math/test_mul_u64_u64_div_u64.c
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@@ -74,6 +74,10 @@ done
*/
static u64 test_mul_u64_add_u64_div_u64(u64 a, u64 b, u64 c, u64 d);
#if __LONG_WIDTH__ >= 64
#define TEST_32BIT_DIV
static u64 test_mul_u64_add_u64_div_u64_32bit(u64 a, u64 b, u64 c, u64 d);
#endif
static int __init test_run(unsigned int fn_no, const char *fn_name)
{
@@ -100,6 +104,12 @@ static int __init test_run(unsigned int fn_no, const char *fn_name)
result = test_mul_u64_add_u64_div_u64(a, b, 0, d);
result_up = test_mul_u64_add_u64_div_u64(a, b, d - 1, d);
break;
#ifdef TEST_32BIT_DIV
case 2:
result = test_mul_u64_add_u64_div_u64_32bit(a, b, 0, d);
result_up = test_mul_u64_add_u64_div_u64_32bit(a, b, d - 1, d);
break;
#endif
}
tests += 2;
@@ -131,6 +141,10 @@ static int __init test_init(void)
return -EINVAL;
if (test_run(1, "test_mul_u64_u64_div_u64"))
return -EINVAL;
#ifdef TEST_32BIT_DIV
if (test_run(2, "test_mul_u64_u64_div_u64_32bit"))
return -EINVAL;
#endif
return 0;
}
@@ -153,6 +167,21 @@ static void __exit test_exit(void)
#include "div64.c"
#ifdef TEST_32BIT_DIV
/* Recompile the generic code for 32bit long */
#undef test_mul_u64_add_u64_div_u64
#define test_mul_u64_add_u64_div_u64 test_mul_u64_add_u64_div_u64_32bit
#undef BITS_PER_ITER
#define BITS_PER_ITER 16
#define mul_u64_u64_add_u64 mul_u64_u64_add_u64_32bit
#undef mul_u64_long_add_u64
#undef add_u64_long
#undef mul_add
#include "div64.c"
#endif
module_init(test_init);
module_exit(test_exit);