Messages in this thread | | | Date | Thu, 4 Apr 2002 11:14:33 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: Patch: linux-2.5.8-pre1/kernel/exit.c change caused BUG() at boot time |
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On 4 Apr 2002, Robert Love wrote: > > Thanks for the CC. I've been looking into this problem. I am not too > sure why we require protection from concurrency via preemption and not > via SMP. In other words, why are we SMP-safe but not preempt-safe here. > > I don't really have an answer.
The answer is that preempt_schedule() illegally sets
current->state = TASK_RUNNING;
without asking the process whether that's ok. The SMP code never does anything like that.
Linus
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