sparc64: Add some more commentary to __raw_local_irq_save()
Suggested by Peter Zijlstra Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -80,6 +80,13 @@ static inline unsigned long __raw_local_irq_save(void)
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/* Disable interrupts to PIL_NORMAL_MAX unless we already
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* are using PIL_NMI, in which case PIL_NMI is retained.
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*
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* The only values we ever program into the %pil are 0,
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* PIL_NORMAL_MAX and PIL_NMI.
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*
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* Since PIL_NMI is the largest %pil value and all bits are
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* set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
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* actually is.
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*/
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__asm__ __volatile__(
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"rdpr %%pil, %0\n\t"
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