On Wed, Nov 24, 2004 at 10:42:45PM +0000, Maciej W. Rozycki wrote: > > That interrupt disabling in some cache flushes dates back further than > > CVS history. Seems once uppon a time there was some CPU which didn't > > like cache flushes with interrupts enabled. This is rather bad for > > latencies so unless somebody else on this list recalls a good reason > > I'd like to remove this. > > Some R4600 (v1.1?) errata workaround? Or was it elsewhere? V1.7 you mean - it identifies as 1.0 in c0_prid though. I don't have my erratas for this one anymore. I've checked erratum #3 of V2.0 with one of the R4600 designers already a while ago and he said disabling interrupts isn't necessary. The ancient Linux code I was refering to used to disable interrupts for all CPUs. Supported CPUs back then were R4000, R4400, R4600 only, so it must have been one of those. Ralf
