Messages in this thread | | | Date | Fri, 18 Nov 2005 16:37:25 +0800 | From | liyu <> | Subject | [Question] spin_lock in interrupt handler. |
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Hi, every one in LKML.
I have one question about how to use spin_lock.
I read Documentation/spinlocks.txt wrote by Linus. The Lesson 1 and 2 are simple for me. But I confused in Lesson 3. The most doublt is why we can not use spin_lock_irq*() version in interrupt handler?
At i386, I known the interrupt is disabled in interrupt handler. I think this feature is supplied in handware-level. The spin_lock_irqrestore() will use 'sti' instruction internal, it will change interrupt mask bit in FLAGS register, do this have re-enable interrupt, even in interrput handler? I can not sure this.
Thanks in advanced.
-liyu
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