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sparc64: Add some more commentary to __raw_local_irq_save()

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Suggested by Peter Zijlstra

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-04-13 01:50:43 -07:00
parent 9343af084c
commit c011f80ba0
1 changed files with 7 additions and 0 deletions
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7
arch/sparc/include/asm/irqflags_64.h
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@ -80,6 +80,13 @@ static inline unsigned long __raw_local_irq_save(void)
/* Disable interrupts to PIL_NORMAL_MAX unless we already
* are using PIL_NMI, in which case PIL_NMI is retained.
*
* The only values we ever program into the %pil are 0,
* PIL_NORMAL_MAX and PIL_NMI.
*
* Since PIL_NMI is the largest %pil value and all bits are
* set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
* actually is.
*/
__asm__ __volatile__(
"rdpr %%pil, %0\n\t"