From: Luis Chamberlain <mcgrof@xxxxxxxxxx>
The "odd" 256 value was just an issue with the umh never
wrapping it around with WEXITSTATUS() for us. Now that it
does that, we can use a sane value / name for the selftest,
and this is no longer a oddity.
We add a way to detect this for older kernels, and support
the old return value for kernel code where it was given.
This never affected userspace.
Reported-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
tools/testing/selftests/kmod/kmod.sh | 46 +++++++++++++++++++++++-----
1 file changed, 39 insertions(+), 7 deletions(-)
diff --git a/tools/testing/selftests/kmod/kmod.sh b/tools/testing/selftests/kmod/kmod.sh
index da60c3bd4f23..df7b21d8561c 100755
--- a/tools/testing/selftests/kmod/kmod.sh
+++ b/tools/testing/selftests/kmod/kmod.sh
@@ -64,6 +64,8 @@ ALL_TESTS="$ALL_TESTS 0009:150:1"
ALL_TESTS="$ALL_TESTS 0010:1:1"
ALL_TESTS="$ALL_TESTS 0011:1:1"
+MODULE_NOT_FOUND="FAILURE"
+
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
@@ -155,14 +157,19 @@ test_finish()
echo "Test completed"
}
+# OLD_FAILURE is just because the old kernel umh never wrapped
+# the error with WEXITSTATUS(). Now that it does it, we get the
+# appropriate actual value from userspace observed in-kernel.
+
+# We keep the old mapping to ensure this script keeps working
+# with older kernels.
errno_name_to_val()
{
case "$1" in
- # kmod calls modprobe and upon of a module not found
- # modprobe returns just 1... However in the kernel we
- # *sometimes* see 256...
- MODULE_NOT_FOUND)
+ OLD_FAILURE)
echo 256;;
+ FAILURE)
+ echo 1;;
SUCCESS)
echo 0;;
-EPERM)
@@ -181,7 +188,9 @@ errno_name_to_val()
errno_val_to_name()
case "$1" in
256)
- echo MODULE_NOT_FOUND;;
+ echo OLD_FAILURE;;
+ 1)
+ echo FAILURE;;
0)
echo SUCCESS;;
-1)
@@ -335,6 +344,28 @@ kmod_defaults_fs()
config_set_test_case_fs
}
+check_umh()
+{
+ NAME=''
+
+ kmod_defaults_driver
+ config_num_threads 1
+ printf '\0' >"$DIR"/config_test_driver
+ config_trigger ${FUNCNAME[0]}
+ RC=$(config_get_test_result)
+ if [[ "$RC" == "256" ]]; then
+ MODULE_NOT_FOUND="OLD_FAILURE"
+ echo "check_umh: you have and old umh which didn't wrap errors"
+ echo " with WEXITSTATUS(). This is OK!"
+ elif [[ "$RC" != "1" ]]; then
+ echo "check_umh: Unexpected return value with no modprobe argument: $RC"
+ exit
+ else
+ echo "check_umh: You have a new umh which wraps erros with"
+ echo " WEXITSTATUS(). This is OK!"
+ fi
+}
+
kmod_test_0001_driver()
{
NAME='\000'
@@ -343,7 +374,7 @@ kmod_test_0001_driver()
config_num_threads 1
printf $NAME >"$DIR"/config_test_driver
config_trigger ${FUNCNAME[0]}
- config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
+ config_expect_result ${FUNCNAME[0]} $MODULE_NOT_FOUND
}
kmod_test_0001_fs()
@@ -371,7 +402,7 @@ kmod_test_0002_driver()
config_set_driver $NAME
config_num_threads 1
config_trigger ${FUNCNAME[0]}
- config_expect_result ${FUNCNAME[0]} MODULE_NOT_FOUND
+ config_expect_result ${FUNCNAME[0]} $MODULE_NOT_FOUND
}
kmod_test_0002_fs()
@@ -648,6 +679,7 @@ load_req_mod
MODPROBE=$(</proc/sys/kernel/modprobe)
trap "test_finish" EXIT
+check_umh
parse_args $@
exit 0
--
2.26.2
