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userfaultfd: non-cooperative: selftest: introduce userfaultfd_open

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userfaultfd_open will be needed by the non cooperative selftest.

Link: http://lkml.kernel.org/r/20161216144821.5183-39-aarcange@redhat.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Michael Rapoport <RAPOPORT@il.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport 2017-02-22 15:44:01 -08:00 committed by Linus Torvalds
parent 47dd924508
commit 6228b8f2d1
1 changed files with 25 additions and 16 deletions
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41
tools/testing/selftests/vm/userfaultfd.c
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@ -81,7 +81,7 @@ static int huge_fd;
static char *huge_fd_off0;
#endif
static unsigned long long *count_verify;
static int uffd, finished, *pipefd;
static int uffd, uffd_flags, finished, *pipefd;
static char *area_src, *area_dst;
static char *zeropage;
pthread_attr_t attr;
@ -512,23 +512,9 @@ static int stress(unsigned long *userfaults)
return 0;
}
static int userfaultfd_stress(void)
static int userfaultfd_open(void)
{
void *area;
char *tmp_area;
unsigned long nr;
struct uffdio_register uffdio_register;
struct uffdio_api uffdio_api;
unsigned long cpu;
int uffd_flags, err;
unsigned long userfaults[nr_cpus];
allocate_area((void **)&area_src);
if (!area_src)
return 1;
allocate_area((void **)&area_dst);
if (!area_dst)
return 1;
uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
if (uffd < 0) {
@ -549,6 +535,29 @@ static int userfaultfd_stress(void)
return 1;
}
return 0;
}
static int userfaultfd_stress(void)
{
void *area;
char *tmp_area;
unsigned long nr;
struct uffdio_register uffdio_register;
unsigned long cpu;
int err;
unsigned long userfaults[nr_cpus];
allocate_area((void **)&area_src);
if (!area_src)
return 1;
allocate_area((void **)&area_dst);
if (!area_dst)
return 1;
if (userfaultfd_open() < 0)
return 1;
count_verify = malloc(nr_pages * sizeof(unsigned long long));
if (!count_verify) {
perror("count_verify");