spin_lock_irq / spin_lock_irqsave ??

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Hi list,

Can anybody tell me what is the intended use of the spin_lock_irqsave?

The only extra thing spn_lock_irqsave does when compared to spin_lock_irq is,
it saves the current context(?) in some variable. But why is it required at all?

Isn't it done by the kernel??

Thanks and regards,
Mahesh.


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