From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [Linux-ia64] Question about wbinvd
Date: Tue, 04 Jun 2002 18:36:04 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590701905638@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590701905635@msgid-missing>
>>>>> On Tue, 4 Jun 2002 10:13:43 -0700, "Grover, Andrew" <andrew.grover@intel.com> said:
Andy> I don't know if it is not necessary or not. We changed it
Andy> because "wbinvd" is a IA32-ism. IA64 may need to define
Andy> ACPI_FLUSH_CPU_CACHE to something appropriate.
The current implementation is most likely broken. I'm not exactly
sure what the requirements of ACPI_FLUSH_CPU_CACHE are, that's why I'm
saying "most likely". I suspect it ought to be using the SAL rather
than the PAL flush cache routines (so that off-chip caches get
flushed, too). Also, IIRC, the latest interpretation of the SAL
cache-flush routines is that they flush the caches only on the CPU
that is making the call. So, if the intent is to flush all the caches
on all CPUs, an IPI would be needed.
--david
next prev parent reply other threads:[~2002-06-04 18:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-04 7:45 [Linux-ia64] Question about wbinvd Takanori Kawano
2002-06-04 12:02 ` Matthew Wilcox
2002-06-04 17:13 ` Grover, Andrew
2002-06-04 18:36 ` David Mosberger [this message]
2002-06-05 5:33 ` Takanori Kawano
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