Hi All,
I found a smp race condition on startup
of the 2.4.18 kernel when I put a printk
in schedule.
See the comment below in
/init/main.c
/*
* We need to finalize in a non-__init function or
else race conditions
* between the root thread and the init thread may
cause start_kernel to
* be reaped by free_initmem before the root thread
has proceeded to
* cpu_idle.
*/
static void rest_init(void)
Note that init_idle the first thing called from
cpu_idle.
& it is freed from
free_initmem in the init function in main.c
which may be called before the cpu
gets into cpu_idle.
Here is the patch.
--- linux.orig/kernel/sched.c Fri Dec 21 17:42:04
2001
+++ linux/kernel/sched.c Tue Apr 30 12:22:02
2002
@@ -1299,7 +1299,7 @@
extern unsigned long wait_init_idle;
-void __init init_idle(void)
+void init_idle(void)
{
struct schedule_data * sched_data;
sched_data =
&aligned_data[smp_processor_id()].schedule_data;
=====
D.J. Barrow Linux kernel developer
eMail: dj_barrow@ariasoft.ie
Home: +353-22-47196.
Work: +353-91-758353
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This archive was generated by hypermail 2b29 : Tue Apr 30 2002 - 22:00:19 EST