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selftests/mm: drop test_uffdio_zeropage_eexist 

The idea was trying to flip this var in the alarm handler from time to
time to test -EEXIST of UFFDIO_ZEROPAGE, but firstly it's only used in the
zeropage test so probably only used once, meanwhile we passed
"retry==false" so it'll never got tested anyway.

Drop both sides so we always test UFFDIO_ZEROPAGE retries if has_zeropage
is set (!hugetlb).

One more thing to do is doing UFFDIO_REGISTER for the alias buffer too,
because otherwise the test won't even pass!  We were just lucky that this
test never really got ran at all.

Link: https://lkml.kernel.org/r/20230412164238.328238-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2023-04-12 12:42:38 -04:00 committed by Andrew Morton
parent 4af9ff2981
commit 618aeb5d62
1 changed files with 11 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
tools/testing/selftests/mm/userfaultfd.c
View File

@ -88,7 +88,6 @@ static bool test_dev_userfaultfd;
/* exercise the test_uffdio_*_eexist every ALARM_INTERVAL_SECS */
#define ALARM_INTERVAL_SECS 10
static volatile bool test_uffdio_copy_eexist = true;
static volatile bool test_uffdio_zeropage_eexist = true;
/* Whether to test uffd write-protection */
static bool test_uffdio_wp = true;
/* Whether to test uffd minor faults */
@ -1114,7 +1113,7 @@ static void retry_uffdio_zeropage(int ufd,
}
}
static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
static int __uffdio_zeropage(int ufd, unsigned long offset)
{
struct uffdio_zeropage uffdio_zeropage;
int ret;
@ -1138,11 +1137,8 @@ static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
if (res != page_size) {
err("UFFDIO_ZEROPAGE unexpected size");
} else {
if (test_uffdio_zeropage_eexist && retry) {
test_uffdio_zeropage_eexist = false;
retry_uffdio_zeropage(ufd, &uffdio_zeropage,
offset);
}
retry_uffdio_zeropage(ufd, &uffdio_zeropage,
offset);
return 1;
}
} else
@ -1153,7 +1149,7 @@ static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
static int uffdio_zeropage(int ufd, unsigned long offset)
{
return __uffdio_zeropage(ufd, offset, false);
return __uffdio_zeropage(ufd, offset);
}
/* exercise UFFDIO_ZEROPAGE */
@ -1177,6 +1173,13 @@ static int userfaultfd_zeropage_test(void)
assert_expected_ioctls_present(
uffdio_register.mode, uffdio_register.ioctls);
if (area_dst_alias) {
/* Needed this to test zeropage-retry on shared memory */
uffdio_register.range.start = (unsigned long) area_dst_alias;
if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))
err("register failure");
}
if (uffdio_zeropage(uffd, 0))
if (my_bcmp(area_dst, zeropage, page_size))
err("zeropage is not zero");
@ -1763,7 +1766,6 @@ static void sigalrm(int sig)
if (sig != SIGALRM)
abort();
test_uffdio_copy_eexist = true;
test_uffdio_zeropage_eexist = true;
alarm(ALARM_INTERVAL_SECS);
}