kernel/sched.c uses task_set_cpu() and task_release_cpu() to modify the
cpus_runnable flag. On UP, task_set_cpu() is called but
task_release_cpu() is not, it is wrapped in #ifdef CONFIG_SMP. The
result is that all tasks have cpus_runnable=1 and task_has_cpu()
reports true for all tasks.
How to confuse a debugger in one easy lesson :(
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This archive was generated by hypermail 2b29 : Mon Mar 31 2003 - 22:00:22 EST