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Subject: Re: svn commit: r262411 - head/sys/arm/arm
From: Ian Lepore <ian@FreeBSD.org>
To: Konstantin Belousov <kostikbel@gmail.com>
In-Reply-To: <20140305115402.GC24664@kib.kiev.ua>
References: <201402232252.s1NMqmI5075701@svn.freebsd.org>
 <20140305115402.GC24664@kib.kiev.ua>
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Date: Wed, 05 Mar 2014 06:22:47 -0700
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On Wed, 2014-03-05 at 13:54 +0200, Konstantin Belousov wrote:
> On Sun, Feb 23, 2014 at 10:52:48PM +0000, Ian Lepore wrote:
> > Author: ian
> > Date: Sun Feb 23 22:52:48 2014
> > New Revision: 262411
> > URL: http://svnweb.freebsd.org/changeset/base/262411
> > 
> > Log:
> >   If the L2 cache type is PIPT, pass a physical address for a flush.
> >   
> >   While this is technically more correct, I don't think it much matters,
> >   because the only thing in the tree that calls cpu_flush_dcache() is md(4)
> >   and I'm > 99% sure it's bogus that it does so; md has no ability to do
> >   anything that can perturb data cache coherency.
> 
> Yes, md(4) does not break data cache coherency, but I think that
> Marcel added the flush to ensure instruction cache coherency.  The
> intent was to ensure that harward-architecture machines would
> see up-to-date memory content when fetching instructions after
> read on md(4).

Oh.  If that's necessary on ia64, it seems like ia64/elf_machdep.c would
be the place to do the flush.

-- Ian