[PATCH 6/6] selftests/mm: Don't fail uffd-stress if too many CPUs

[Brendan Jackman]

This calculation divides a fixed parameter by an environment-dependent
parameter i.e. the number of CPUs.

The simple way to avoid machine-specific failures here is to just put a
cap on the max value of the latter.

Suggested-by: Mateusz Guzik <mjgu...@gmail.com>
Signed-off-by: Brendan Jackman <jackm...@google.com>
---
 tools/testing/selftests/mm/uffd-stress.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-stress.c 
b/tools/testing/selftests/mm/uffd-stress.c
index 
1facfb79e09aa4113e344d7d90dec06a37264058..f306accbef255c79bc3eeba8b9e42161a88fc10e
 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -453,6 +453,10 @@ int main(int argc, char **argv)
        }
 
        nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+       if (nr_cpus > 32) {
+               /* Don't let calculation below go to zero. */
+               nr_cpus = 32;
+       }
 
        nr_pages_per_cpu = bytes / page_size / nr_cpus;
        if (!nr_pages_per_cpu) {

-- 
2.48.1.601.g30ceb7b040-goog