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SubjectRe: interrupt - spin lock question

> Right, that is why you would use a spin_lock ! :)
>
> Further, you would want to use a spin_lock_irq and related friends. The
> irq disable prevents the race wrt interrupts and the spin_lock prevents
> racing wrt SMP.
>

ok things are clear now. so the spin_lock_irq friends are actually for 2
purposes - preventing racing from interrupts and from SMP. so if SMP is not
chosen only the local_irq_disable() part works right??

do { local_irq_disable(); spin_lock(lock); } while (0)

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