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

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Message-Id: <20100204020224.45379725@magilla.sf.frob.com>
Date:	Wed,  3 Feb 2010 18:02:24 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	"Lu, Hongjiu" <hongjiu.lu@...el.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.


Thanks,
Roland
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