linux-kernel - RE: [patch] x86: ptrace and core-dump extensions for xstate

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Date:	Wed, 3 Feb 2010 18:05:11 -0800
From:	"Lu, Hongjiu" <hongjiu.lu@...el.com>
To:	Roland McGrath <roland@...hat.com>
CC:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lachner, Peter" <peter.lachner@...el.com>
Subject: RE: [patch] x86: ptrace and core-dump extensions for xstate

> 
> > 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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