Benjamin Herrenschmidt wrote:
Well, there's a non-empty set of HW where polling as fast as you can
will effectively prevent it to make fwd progress...
Alan Cox mentioned this. He gave PCI and 10us as an example. I suggested
adding a third parameter that would be a udelay() inserted into the loop. He
countered with this:
spin_until_timeout(readb(foo) & 0x80, 30 * HZ) {
udelay(10);
/* Maybe do other stuff */
}
But I don't know how to make that work *and* have it return a value indicating
timeout or success.
--
Timur Tabi
Linux Kernel Developer @ Freescale
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