diff options
| author | David Laight <david.laight.linux@gmail.com> | 2025-11-05 20:10:35 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-11-20 14:03:42 -0800 |
| commit | 1d1ef8c1fb5e488c0f68499239d8dc61b1399db9 (patch) | |
| tree | 27bf802162a6a92d543dfa99d731c14a3d17f686 /lib | |
| parent | d10bb374c41e4c4dced04ae7d2fe2d782a5858a0 (diff) | |
lib: test_mul_u64_u64_div_u64(): test the 32bit code on 64bit
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/math/test_mul_u64_u64_div_u64.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/math/test_mul_u64_u64_div_u64.c b/lib/math/test_mul_u64_u64_div_u64.c index d8d2c18c4614..338d014f0c73 100644 --- a/lib/math/test_mul_u64_u64_div_u64.c +++ b/lib/math/test_mul_u64_u64_div_u64.c @@ -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); |