Re: Linux 2.6.16-rc3

[Roland Dreier <rdreier@cisco.com>]

 > +/**
 > + * execute_in_process_context - reliably execute the routine with user context
 > + * @fn:		the function to execute
 > + * @data:	data to pass to the function
 > + *
 > + * Executes the function immediately if process context is available,
 > + * otherwise schedules the function for delayed execution.
 > + *
 > + * Returns:	0 - function was executed
 > + *		1 - function was scheduled for execution
 > + */
 > +int execute_in_process_context(void (*fn)(void *data), void *data,
 > +			       struct execute_work *ew)
 > +{
 > +	if (!in_interrupt()) {
 > +		fn(data);
 > +		return 0;
 > +	}

Is testing in_interrupt() really sufficient to make this work?  I seem
to remember that (at least) with CONFIG_PREEMPT disabled, there are
contexts where it is not safe to sleep but where both in_interrupt()
and in_atomic() still return 0.

 - R.
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