task pointer

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I am storng task pointer in my kernel module and when interrupt comes in I am waking the process up by

wake_up_process(task_ptr);

Now, sometime it is possible that the process is already dead, e.g. user to ctrl-c on console. In this case, I get

Unable to handle kernel paging request at virtual address d29dbdb4

Is there a way, where I can very efficiently check for existence of process ?

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