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

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Date:	Fri,  5 Feb 2010 13:15:15 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Oleg Nesterov <oleg@...hat.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

> #define PTRACE_GETREGS(r) (((r) << 16) | PTRACE_GETREGS_CMD)
> 
> ... or something like that?

(You can't use that exact name, it's taken.)  IMHO this is some spurious
obfuscation that is not warranted by saving the two get_user calls in the
kernel.  (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.

Thanks,
Roland
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