> An if(usec > 2000) { printk(..); dump_stack(); } will do.
that's runtime not compile time.
The old situation was a compile time check which is far more powerful.
>
> But do you really want to do this? There might be legitimate reasons
> to compute udelay's parameter with results which are sometimes large.
however that's not valid, because a really large udelay parameter will
cause the delay loop math to overflow. That was the main reason for the
"no more than 2ms or so" restriction.
>
> If you really want to, let's decide on this limit now,
the existing code already has a limit so why not just use that?
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