From: "Lu, Hongjiu" <hongjiu.lu@intel.com>
To: Roland McGrath <roland@redhat.com>
CC: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
       Oleg Nesterov <oleg@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
       Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       LKML <linux-kernel@vger.kernel.org>,
       "Lachner, Peter" <peter.lachner@intel.com>
Date: Wed, 3 Feb 2010 18:05:11 -0800
Subject: RE: [patch] x86: ptrace and core-dump extensions for xstate
Thread-Topic: [patch] x86: ptrace and core-dump extensions for xstate
Thread-Index: AcqlPiLUZH2xsqwMR9ezc7006eRRjAAAEdNA
Message-ID: <8EA2C2C4116BF44AB370468FBF85A7770123AAB2E8@orsmsx504.amr.corp.intel.com>
References: <1265076025.2802.194.camel@sbs-t61.sc.intel.com>
	<20100203230817.E6529AA@magilla.sf.frob.com>
	<8EA2C2C4116BF44AB370468FBF85A7770123AAB0AE@orsmsx504.amr.corp.intel.com>
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In-Reply-To: <20100204020224.45379725@magilla.sf.frob.com>
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> 
> > Gdb calls cpuid during startup time to find out the actual xstate_size
> > on the target machine. It has to be reliable. There is no need for
> > another ptrace option. But we should document it clearly in ABI.
> 
> As I said, I think that is an extremely poor API choice.  There is no such
> arcane requirement in the API now, so we do not have add one.
> 

That is how processor works.


H.J.
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