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Message-ID: <20091018220243.GA32405@Krystal>
Date:	Sun, 18 Oct 2009 18:02:43 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Pavel Machek <pavel@....cz>
Cc:	Pierre-Marc Fournier <pierre-marc.fournier@...ymtl.ca>,
	Jan Blunck <jblunck@...e.de>,
	Steven Munroe <munroesj@...ux.vnet.ibm.com>,
	rp@...s.cs.pdx.edu, Josh Triplett <josh@...htriplett.org>,
	linux-kernel@...r.kernel.org, ltt-dev@...ts.casi.polymtl.ca,
	Pierre Habouzit <madcoder@...ian.org>,
	Jon Bernard <jbernard@...ian.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Bert Wesarg <bert.wesarg@...glemail.com>
Subject: Re: [rp] Userspace RCU 0.2.3

* Pavel Machek (pavel@....cz) wrote:
> On Thu 2009-10-15 13:40:54, Pierre-Marc Fournier wrote:
> > Josh Triplett wrote:
> > > 
> > > Even Debian has given up on real 386 systems at this point, primarily
> > > because system libraries like glibc have; 486 and better represents the
> > > bare minimum required at this point.  I don't know of any distributions
> > > supporting real 386 systems at this point, and doing so would represent
> > > a major undertaking.
> > > 
> > 
> > What about embedded systems? Anyone know if some 386 chips, perhaps even
> > in smp configurations, are still in use in those?
> 
> smp 386: definitely not.

Hrm, so for UP 386, I wonder what's the best approach.

One would be to encapsulate all write accesses to the RCU pointers. If
we detect that the architecture lacks cmpxchg, _all_ update operations
(rcu_assign_pointer, rcu_xchg_pointer and rcu_cmpxchg_pointer) would
have to use the signal-disabled+mutex fall-back.

Does it make sense ?

Mathieu

> 
> -- 
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
> 
> _______________________________________________
> rp mailing list
> rp@...s.cs.pdx.edu
> http://svcs.cs.pdx.edu/mailman/listinfo/rp

-- 
Mathieu Desnoyers
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