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selftests/mm: print some details when uffd-stress gets bad params

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So this can be debugged more easily.

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-5-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Brendan Jackman 2025-03-11 13:18:16 +00:00 committed by Andrew Morton
parent f3b5535abc
commit db0f1c138f
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/mm/uffd-stress.c
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@ -457,7 +457,8 @@ int main(int argc, char **argv)
nr_pages_per_cpu = bytes / page_size / nr_parallel;
if (!nr_pages_per_cpu) {
_err("invalid MiB");
_err("pages_per_cpu = 0, cannot test (%lu / %lu / %lu)",
bytes, page_size, nr_parallel);
usage();
}