Hi,
As far as I understand, spin_lock_bh will disable all softirqs and
spin_lock_irqsave will disable all interrupts and save the flags.
#1.
- One interesting I found is that many drivers use spin_lock_irqsave in
their ioctl and their bottom-half routine rather than spin_lock_bh in
even bottom-half. Why isn't spin_lock_bh used?
#2.
- As long as a section is processed between spin_lock_irqsave and
spin_unlock_irqrestore, I understand no interrupt routine cannot
interrupt between them. Am I correct?
#3.
- If a section is processed between spin_lock_bh and spin_unlock_bh, is
it possible that an interrupt such like timer (NMI) interrupt can
interrupt between them? If that, when it returns back to the critical
section between spin_lock_bh and spin_unlock_bh, is there a possibility
a memory or register can be broken?
Could you help me to confirm if I know correctly?
Thank you,
Daniel
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