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Do as the USII CPU manual suggests and leave interrupts enabled

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for a bit before retrying to resend an IPI in order to avoid
deadlocks if the other CPU is also trying to send one.
OpenSolaris uses a delay of 1 microsecond here but waiting 2
microseconds with interrupts enabled like Linux does shouldn't
hurt but is a bit safer.

MFC after:	1 day
This commit is contained in:
Marius Strobl 2006-09-03 21:20:21 +00:00
parent 405a44d326
commit 7d7ce7f24e
1 changed files with 6 additions and 0 deletions
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6
sys/sparc64/sparc64/mp_machdep.c
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@ -456,6 +456,12 @@ cpu_ipi_send(u_int mid, u_long d0, u_long d1, u_long d2)
intr_restore(s); intr_restore(s);
if ((ids & IDR_NACK) == 0) if ((ids & IDR_NACK) == 0)
return; return;
/*
* Leave interrupts enabled for a bit before retrying
* in order to avoid deadlocks if the other CPU is also
* trying to send an IPI.
*/
DELAY(2);
} }
if ( if (
#ifdef KDB #ifdef KDB