Re: [PATCH 12/53] selftests/mm: khugepaged: group tests in an array

Donet Tom
2026-04-14T07:03:14Z

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Hi Mike

On 4/6/26 7:46 PM, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)"<rppt@kernel.org>
>
> Currently khugepaged decides if a test can run using TEST() macro that
> checks what mem_ops and collapse_context are set by the command line
> arguments.
>
> For better compatibility with ksefltest framework, add an array of 'struct
> test_case's and redefine TEST() macro to conditionally add enabled tests to
> that array.
>
> Then execute the enabled test by looping the test_case's array.
>
> Signed-off-by: Mike Rapoport (Microsoft)<rppt@kernel.org>
> ---
> tools/testing/selftests/mm/khugepaged.c | 43 +++++++++++++++++++++----
> 1 file changed, 36 insertions(+), 7 deletions(-)
>
> diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c
> index e6fb01ca44ed..1cdc5918d20d 100644
> --- a/tools/testing/selftests/mm/khugepaged.c
> +++ b/tools/testing/selftests/mm/khugepaged.c
> @@ -1161,6 +1161,34 @@ static void parse_test_type(int argc, char **argv)
> get_finfo(argv[1]);
> }
>
> +typedef void (*test_fn)(struct collapse_context *c, struct mem_ops *ops);
> +
> +struct test_case {
> + struct collapse_context *ctx;
> + struct mem_ops *ops;
> + const char *desc;
> + test_fn fn;
> +};
> +
> +#define MAX_TEST_CASES 45

I see 48 tests in |khugepaged.c|, and running |khugepaged all:all|
results in the error below. Should |MAX_TEST_CASES| be updated to 48
instead?

./khugepaged all:all .
TAP version 13
# Save THP and khugepaged settings... OK
Bail out! MAX_ADD_CASES is too small
# Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
# Restore THP and khugepaged settings... OK
# Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0

> +static struct test_case test_cases[MAX_TEST_CASES];
> +static int nr_test_cases;
> +
> +#define TEST(t, c, o) do { \
> + if (c && o) { \
> + if (nr_test_cases >= MAX_TEST_CASES) { \

I had a small question—since the number of tests is fixed, would this
check still be necessary?

> + printf("MAX_ADD_CASES is too small\n"); \
> + exit(EXIT_FAILURE); \
> + } \
> + test_cases[nr_test_cases++] = (struct test_case){ \
> + .ctx = c, \
> + .ops = o, \
> + .desc = #t, \
> + .fn = t, \
> + }; \
> + } \
> + } while (0)
> +
> int main(int argc, char **argv)
> {
> int hpage_pmd_order;
> @@ -1216,13 +1244,6 @@ int main(int argc, char **argv)
>
> alloc_at_fault();
>
> -#define TEST(t, c, o) do { \
> - if (c && o) { \
> - printf("\nRun test: " #t " (%s:%s)\n", c->name, o->name); \
> - t(c, o); \
> - } \
> - } while (0)
> -
> TEST(collapse_full, khugepaged_context, anon_ops);
> TEST(collapse_full, khugepaged_context, file_ops);
> TEST(collapse_full, khugepaged_context, shmem_ops);
> @@ -1284,5 +1305,13 @@ int main(int argc, char **argv)
> TEST(madvise_retracted_page_tables, madvise_context, file_ops);
> TEST(madvise_retracted_page_tables, madvise_context, shmem_ops);
>
> + for (int i = 0; i < nr_test_cases; i++) {
> + struct test_case *t = &test_cases[i];
> +
> + exit_status = KSFT_PASS;
> + printf("\nRun test: %s: (%s:%s)\n", t->desc, t->ctx->name, t->ops->name);
> + t->fn(t->ctx, t->ops);
> + }
> +
> restore_settings(0);
> }

-Donet

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