From: Pankaj Raghav p.raghav@samsung.com
create_pagecache_thp_and_fd() in split_huge_page_test.c used the variable dummy to perform mmap read.
However, this test was skipped even on XFS which has large folio support. The issue was compiler (gcc 13.2.0) was optimizing out the dummy variable, therefore, not creating huge page in the page cache.
Add volatile keyword to force compiler not to optimize out the loop where we read from the mmaped addr.
Signed-off-by: Pankaj Raghav p.raghav@samsung.com --- tools/testing/selftests/mm/split_huge_page_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c index d3c7f5fb3e7b..c573a58f80ab 100644 --- a/tools/testing/selftests/mm/split_huge_page_test.c +++ b/tools/testing/selftests/mm/split_huge_page_test.c @@ -300,7 +300,7 @@ int create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, int *fd, char **addr) { size_t i; - int __attribute__((unused)) dummy = 0; + volatile int __attribute__((unused)) dummy = 0;
srand(time(NULL));
base-commit: d97496ca23a2d4ee80b7302849404859d9058bcd