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

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Message-ID: <20100209172807.GA19529@redhat.com>
Date:	Tue, 9 Feb 2010 18:28:07 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Roland McGrath <roland@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lu, Hongjiu" <hongjiu.lu@...el.com>,
	"Lachner, Peter" <peter.lachner@...el.com>
Subject: Re: [patch] x86: ptrace and core-dump extensions for xstate

Sorry for delay!

On 02/05, Suresh Siddha wrote:
>
> On Fri, 2010-02-05 at 13:15 -0800, Roland McGrath wrote:
>
> > (OTOH, my suggestion requires a whole extra 5 lines of code or so
> > in compat_sys_ptrace because the indirection in the ABI is sensitive to
> > userland word size.)  But I don't feel strongly about the particulars of
> > the ptrace API addition, just that it be generic to cover any regset and
> > not be prone to implicit buffer-size miscommunications.  I'll leave it to
> > whatever Oleg wants to implement.
>
> Ok. I will split the previous patch in to two patches and re-post it. I
> can help Oleg with reviewing and testing the generic implementation
> whenever it is ready.

OK, I'll try to do this "asap", this generic implementation looks easy.

Except, I am not sure I really understand the problem, need to read
the regset code and then re-read this thread ;)

Oleg.

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