From: Alan Modra <amodra@bigpond.net.au>
To: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>,
linux-arch@vger.kernel.org, linuxppc-dev@ozlabs.org,
linux-kernel@vger.kernel.org, rth@twiddle.net
Subject: Re: [RFC/PATCH] Make powerpc64 use __thread for per-cpu variables
Date: Thu, 11 May 2006 10:34:38 +0930 [thread overview]
Message-ID: <20060511010438.GE24458@bubble.grove.modra.org> (raw)
In-Reply-To: <17506.21908.857189.645889@cargo.ozlabs.ibm.com>
On Thu, May 11, 2006 at 07:05:24AM +1000, Paul Mackerras wrote:
> No, Richard has a point, it's not the value that is the concern, it's
> the address, which gcc could assume is still valid after a barrier.
> Drat.
That may never happen, at least with a compiler that knows how to
optimise away the addi. You're using -mtls-size=16 so all your accesses
should look like
lwz rn,per_cpu_var@tprel(13)
gcc shouldn't think there is any reason to cache the address.
--
Alan Modra
IBM OzLabs - Linux Technology Centre
next prev parent reply other threads:[~2006-05-11 1:04 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-10 4:03 [RFC/PATCH] Make powerpc64 use __thread for per-cpu variables Paul Mackerras
2006-05-10 5:16 ` Olof Johansson
2006-05-10 5:35 ` Alan Modra
2006-05-10 6:22 ` David S. Miller
2006-05-10 6:29 ` Paul Mackerras
2006-05-10 6:39 ` David S. Miller
2006-05-10 7:21 ` Benjamin Herrenschmidt
2006-05-10 7:41 ` Paul Mackerras
2006-05-10 10:14 ` David Howells
2006-05-10 15:47 ` Richard Henderson
2006-05-10 18:04 ` Steven Rostedt
2006-05-10 19:40 ` David S. Miller
2006-05-10 21:05 ` Paul Mackerras
2006-05-10 22:25 ` David S. Miller
2006-05-10 23:17 ` Segher Boessenkool
2006-05-11 0:22 ` Richard Henderson
2006-05-11 23:41 ` Segher Boessenkool
2006-05-11 1:04 ` Alan Modra [this message]
2006-05-11 1:21 ` Paul Mackerras
2006-05-11 2:01 ` Alan Modra
2006-05-11 23:42 ` Segher Boessenkool
2006-05-10 23:05 ` Paul Mackerras
2006-05-10 23:44 ` Paul Mackerras
2006-05-11 0:11 ` David S. Miller
2006-05-18 23:50 ` Paul Mackerras
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