Rick Brown wrote:
I was curious that after a call to preempt_disable(), can I call a
function that MAY sleep?
Bad idea. That can make the kernel do bad things...
Just take a look at schedule() in kernel/sched.c:
asmlinkage void __sched schedule(void)
{
...
if (unlikely(in_atomic() && !current->exit_state)) {
printk(KERN_ERR "BUG: scheduling while atomic: "
"%s/0x%08x/%d\n",
current->comm, preempt_count(), current->pid);
dump_stack();
}
Of course, in_atomic() checks whether you disabled preemption.
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