+void run_dio_using_hugetlb(unsigned int start_off, unsigned int end_off) +{
- int fd;
- char *buffer = NULL;
- char *orig_buffer = NULL;
- size_t h_pagesize = 0;
- size_t writesize;
- int free_hpage_b = 0;
- int free_hpage_a = 0;
- writesize = end_off - start_off;
- /* Get the default huge page size */
- h_pagesize = default_huge_page_size();
- if (!h_pagesize)
ksft_exit_fail_msg("Unable to determine huge page size\n");- /* Open the file to DIO */
- fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT);
I encountered a build error as follows in NixOS:
In file included from /nix/store/fwh4fxd747m0py3ib3s5abamia9nrf90-glibc-2.39-52-dev/include/fcntl.h:342, from hugetlb_dio.c:15: In function ‘open’, inlined from ‘run_dio_using_hugetlb’ at hugetlb_dio.c:41:7: /nix/store/fwh4fxd747m0py3ib3s5abamia9nrf90-glibc-2.39-52-dev/include/bits/fcntl2.h:50:11: error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments 50 | __open_missing_mode ();
I saw a commit that fixed similar issues with open syscall before: 8b65ef5ad486 ("selftests/mm: Fix build with _FORTIFY_SOURCE")
So something like this should fix the issue?
- fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT); + fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT, 0664);
- if (fd < 0)
ksft_exit_fail_msg("Error opening file");