Sorry, I was just sending to myself for testing, git send-email picked
up stable@xxxxxxxxxxxxxxx too. Please ignore this.
On 5/21/24 12:07, Dev Jain wrote:
Currently, if at runtime we are not able to allocate a huge page, the
test will trivially pass on Aarch64 due to no exception being raised on
division by zero while computing compaction_index. Fix that by checking
for nr_hugepages == 0. Anyways, in general, avoid a division by zero by
exiting the program beforehand. While at it, fix a typo.
Changes in v2:
- Combine with this series, handle unsigned long number of hugepages
Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dev Jain <dev.jain@xxxxxxx>
---
tools/testing/selftests/mm/compaction_test.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c
index 4f42eb7d7636..0b249a06a60b 100644
--- a/tools/testing/selftests/mm/compaction_test.c
+++ b/tools/testing/selftests/mm/compaction_test.c
@@ -82,12 +82,13 @@ int prereq(void)
return -1;
}
-int check_compaction(unsigned long mem_free, unsigned int hugepage_size)
+int check_compaction(unsigned long mem_free, unsigned long hugepage_size)
{
+ unsigned long nr_hugepages_ul;
int fd, ret = -1;
int compaction_index = 0;
- char initial_nr_hugepages[10] = {0};
- char nr_hugepages[10] = {0};
+ char initial_nr_hugepages[20] = {0};
+ char nr_hugepages[20] = {0};
/* We want to test with 80% of available memory. Else, OOM killer comes
in to play */
@@ -134,7 +135,12 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size)
/* We should have been able to request at least 1/3 rd of the memory in
huge pages */
- compaction_index = mem_free/(atoi(nr_hugepages) * hugepage_size);
+ nr_hugepages_ul = strtoul(nr_hugepages, NULL, 10);
+ if (!nr_hugepages_ul) {
+ ksft_print_msg("ERROR: No memory is available as huge pages\n");
+ goto close_fd;
+ }
+ compaction_index = mem_free/(nr_hugepages_ul * hugepage_size);
lseek(fd, 0, SEEK_SET);
@@ -145,11 +151,11 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size)
goto close_fd;
}
- ksft_print_msg("Number of huge pages allocated = %d\n",
- atoi(nr_hugepages));
+ ksft_print_msg("Number of huge pages allocated = %lu\n",
+ nr_hugepages_ul);
if (compaction_index > 3) {
- ksft_print_msg("ERROR: Less that 1/%d of memory is available\n"
+ ksft_print_msg("ERROR: Less than 1/%d of memory is available\n"
"as huge pages\n", compaction_index);
goto close_fd;
}
