Hi,
I have migrated a system from RTL 2.0 to 2.2 today, and when I try to load
the rtl_time module I get a kernel oops due to a NULL pointer.
This is caused by references to kb_mksound in init_hrtime(), but because
I use a kernel without support for virtual terminals, kb_mksound is
defined and exported, but not initialized, so when kb_mksound is
called, things are not going too well.
The quite obvious soulution would be to enable support for virtual
terminals, which is not a big problem in many cases.
The maybe not so obvious solution, which however makes me happy, is to
remove the call to kd_mksound in init_hrtime when VT support is not
persent in the kernel.
I have made a patch that should take care of the problem, and I hope
someone would consider applying it to the RTL2.2 distribution.
Patch follows:
--- rtlinux-2.2.orig/Makefile Wed Feb 23 23:07:24 2000
+++ rtlinux-2.2/Makefile Wed Jun 14 17:45:05 2000
@@ -70,6 +70,10 @@
AFLAGS += -D__SMP__
endif
+ifdef CONFIG_VT
+CFLAGS += -D__CONFIG_VT__
+endif
+
CFLAGS += -D__RTL__ -D__KERNEL__ -DMODULE
include schedulers/$(ARCH)/Makefile
--- rtlinux-2.2.orig/schedulers/i386/rtl_time.c Wed Feb 23 23:07:24 2000
+++ rtlinux-2.2/schedulers/i386/rtl_time.c Wed Jun 14 17:47:44 2000
@@ -352,7 +352,9 @@
{
int flags;
+#ifdef __CONFIG_VT__
kd_mksound(0, 0); /* clear the possibly pending sound timer */
+#endif
save_kd_mksound = kd_mksound;
kd_mksound = rtl_kd_mksound;
--
�ystein Svendsen
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