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selftests/vm: use memfd for hugepage-mremap test 

For dropping the hugetlb mountpoint in run_vmtests.sh.  Cleaned it up a
little bit around the changed codes.

Link: https://lkml.kernel.org/r/20221014144013.94027-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2022-10-14 10:40:13 -04:00 committed by Andrew Morton
parent 62f33fa228
commit 4705700d4f
1 changed files with 9 additions and 12 deletions
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21
tools/testing/selftests/vm/hugepage-mremap.c
View File

@ -22,6 +22,7 @@
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <linux/userfaultfd.h>
#include <sys/ioctl.h>
#include <string.h>
#define DEFAULT_LENGTH_MB 10UL
#define MB_TO_BYTES(x) (x * 1024 * 1024)
@ -108,26 +109,23 @@ static void register_region_with_uffd(char *addr, size_t len)
int main(int argc, char *argv[])
{
size_t length = 0;
int ret = 0, fd;
if (argc != 2 && argc != 3) {
printf("Usage: %s [length_in_MB] <hugetlb_file>\n", argv[0]);
if (argc >= 2 && !strcmp(argv[1], "-h")) {
printf("Usage: %s [length_in_MB]\n", argv[0]);
exit(1);
}
/* Read memory length as the first arg if valid, otherwise fallback to
* the default length.
*/
if (argc == 3)
length = argc > 2 ? (size_t)atoi(argv[1]) : 0UL;
if (argc >= 2)
length = (size_t)atoi(argv[1]);
else
length = DEFAULT_LENGTH_MB;
length = length > 0 ? length : DEFAULT_LENGTH_MB;
length = MB_TO_BYTES(length);
int ret = 0;
/* last arg is the hugetlb file name */
int fd = open(argv[argc-1], O_CREAT | O_RDWR, 0755);
fd = memfd_create(argv[0], MFD_HUGETLB);
if (fd < 0) {
perror("Open failed");
exit(1);
@ -185,7 +183,6 @@ int main(int argc, char *argv[])
}
close(fd);
unlink(argv[argc-1]);
return ret;
}