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Date: Mon, 14 Apr 2003 18:48:33 +0200
From: Ralf Baechle <ralf@linux-mips.org>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: linux-mips@linux-mips.org
Subject: Re: minor c-r4k.c cleanup
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On Tue, Apr 15, 2003 at 12:24:25AM +0900, Atsushi Nemoto wrote:

> r4k_dma_cache_xxx should not flush icache ?

The dma_* functions of course don't need I-cache coherence.

> And I wonder why r4k_flush_pcache_mm (and r4k_flush_pcache_all) does
> nothing if cpu_has_dc_aliases was not true.  I'm still
> investigating...

R4000SC / R4400SC caches have the subset property.  S-cache cacheops
flush the primary caches as well and P-caches must always be a subset
of the S-cache or operation is undefined.

  Ralf