Gilles Chanteperdrix wrote:
> ...
> Argh.... The switchtest driver is relying on __xn_exec_current to have
> context switches occur precisely in the mode we want. __xn_exec_adaptive
> introduce more context switches around which we can not place separate
> checks for fpu context, so, in short, breaks it badly. Fixing this
> requires turning the switchtest driver into a skin with its own syscalls.

Independent of how switchtest (or RTDM) is fixed again: Do you already
have a patch like this in your queue?

diff --git a/ksrc/drivers/testing/switchtest.c b/ksrc/drivers/testing/switchtest.c
index 057094b..09cd0ec 100644
--- a/ksrc/drivers/testing/switchtest.c
+++ b/ksrc/drivers/testing/switchtest.c
@@ -665,6 +665,9 @@ static int rtswitch_ioctl_rt(struct rtdm_dev_context *context,
 	struct rttst_swtest_dir fromto;
 
 	switch (request) {
+	case RTTST_RTIOC_SWTEST_SET_TASKS_COUNT:
+	case RTTST_RTIOC_SWTEST_SET_CPU:
+	case RTTST_RTIOC_SWTEST_SET_PAUSE:
 	case RTTST_RTIOC_SWTEST_REGISTER_UTASK:
 	case RTTST_RTIOC_SWTEST_CREATE_KTASK:
 	case RTTST_RTIOC_SWTEST_GET_SWITCHES_COUNT:

I.e. add the missing reflections of NRT IOCTLs.

Jan