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Re: Using __kuser_cmpxchg

From: Andrew Haley <aph at redhat dot com>
To: David Daney <ddaney at avtrex dot com>
Cc: Nicolas Pitre <nico at cam dot org>, Paul Brook <paul at codesourcery dot com>, java at gcc dot gnu dot org, linux-arm-kernel at lists dot arm dot linux dot org dot uk
Date: Thu, 15 Nov 2007 19:37:49 +0000
Subject: Re: Using __kuser_cmpxchg
References: <200711151759.lAFHxKa4027497@devserv.devel.redhat.com> <alpine.LFD.0.9999.0711151326510.21255@xanadu.home> <18236.39235.500965.810488@zebedee.pink> <473C9A6B.9080406@avtrex.com> <18236.40178.870108.828040@zebedee.pink> <473C9EFF.2070209@avtrex.com>

David Daney writes:
 > Andrew Haley wrote:
 > > David Daney writes:
 > >  > 
 > >  > Am I missing something here?
 > >  > 
 > >  > Is it really impossible to implement compare_and_swap on these ARM 
 > >  > platforms?
 > > 
 > > No, but it is exceedingly difficult to do it *efficiently*.
 > > 
 > 
 > Right, I think you told me that once before.
 > 
 > I forget, is the arm-linuxeabi port of libgcj currently sacrificing 
 > correctness for speed?

Yeah, that's right, and it's what I'm trying to fix.  Unfortunately,
the suggested cure seems to be worse than the disease.

Andrew.

References:
- Re: Using __kuser_cmpxchg
  - From: Nicolas Pitre
- Re: Using __kuser_cmpxchg
  - From: Andrew Haley
- Re: Using __kuser_cmpxchg
  - From: David Daney
- Re: Using __kuser_cmpxchg
  - From: Andrew Haley
- Re: Using __kuser_cmpxchg
  - From: David Daney

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