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selftests/mm: add messages about test errors to the cow tests

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It is not sufficiently clear what the individual tests in the cow test
program are checking so add messages for the failure cases.

Link: https://lkml.kernel.org/r/20250610-selftest-mm-cow-tweaks-v1-4-43cd7457500f@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Suggested-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mark Brown 2025-06-10 15:13:57 +01:00 committed by Andrew Morton
parent 32dc2d5e3f
commit 4ff52d4a2d
1 changed files with 20 additions and 8 deletions
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28
tools/testing/selftests/mm/cow.c
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@ -268,8 +268,10 @@ static void do_test_cow_in_parent(char *mem, size_t size, bool do_mprotect,
* fail because (a) harder to fix and (b) nobody really cares.
* Flag them as expected failure for now.
*/
ksft_print_msg("Leak from parent into child\n");
log_test_result(KSFT_XFAIL);
} else {
ksft_print_msg("Leak from parent into child\n");
log_test_result(KSFT_FAIL);
}
close_comm_pipes:
@ -397,8 +399,10 @@ static void do_test_vmsplice_in_parent(char *mem, size_t size,
* fail because (a) harder to fix and (b) nobody really cares.
* Flag them as expected failure for now.
*/
ksft_print_msg("Leak from child into parent\n");
log_test_result(KSFT_XFAIL);
} else {
ksft_print_msg("Leak from child into parent\n");
log_test_result(KSFT_FAIL);
}
close_pipe:
@ -570,10 +574,12 @@ static void do_test_iouring(char *mem, size_t size, bool use_fork)
}
/* Finally, check if we read what we expected. */
if (!memcmp(mem, tmp, size))
if (!memcmp(mem, tmp, size)) {
log_test_result(KSFT_PASS);
else
} else {
ksft_print_msg("Longtom R/W pin is not reliable\n");
log_test_result(KSFT_FAIL);
}
quit_child:
if (use_fork) {
@ -725,10 +731,12 @@ static void do_test_ro_pin(char *mem, size_t size, enum ro_pin_test test,
ksft_perror("PIN_LONGTERM_TEST_READ failed");
log_test_result(KSFT_FAIL);
} else {
if (!memcmp(mem, tmp, size))
if (!memcmp(mem, tmp, size)) {
log_test_result(KSFT_PASS);
else
} else {
ksft_print_msg("Longterm R/O pin is not reliable\n");
log_test_result(KSFT_FAIL);
}
}
ret = ioctl(gup_fd, PIN_LONGTERM_TEST_STOP);
@ -1417,10 +1425,12 @@ static void do_test_anon_thp_collapse(char *mem, size_t size,
else
ret = -EINVAL;
if (!ret)
if (!ret) {
log_test_result(KSFT_PASS);
else
} else {
ksft_print_msg("Leak from parent into child\n");
log_test_result(KSFT_FAIL);
}
close_comm_pipes:
close_comm_pipes(&comm_pipes);
}
@ -1528,10 +1538,12 @@ static void test_cow(char *mem, const char *smem, size_t size)
memset(mem, 0xff, size);
/* See if we still read the old values via the other mapping. */
if (!memcmp(smem, old, size))
if (!memcmp(smem, old, size)) {
log_test_result(KSFT_PASS);
else
} else {
ksft_print_msg("Other mapping modified\n");
log_test_result(KSFT_FAIL);
}
free(old);
}