linux-kernel - Re: [PATCH 1/5] asm-generic/ptrace.h: start a common low level ptrace helper

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Message-ID: <20110414180936.GA20924@redhat.com>
Date:	Thu, 14 Apr 2011 20:09:36 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org,
	kgdb-bugreport@...ts.sourceforge.net,
	Jason Wessel <jason.wessel@...driver.com>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/5] asm-generic/ptrace.h: start a common low level
	ptrace helper

On 04/14, Mike Frysinger wrote:
>
> This implements a bunch of helper funcs for poking the registers of a
> ptrace structure.  Now common code should be able to portably update
> specific registers (like kgdb updating the PC).

The whole series looks correct, but I am a bit confused...

> +#ifndef GET_IP
> +#define GET_IP(regs) ((regs)->pc)
> +#endif

Could you explain this ifndef ?

IIUC, this should be included by arch/*/asm/ptrace.h. Isn't it better
to simply require that if you include asm-generic/ptrace.h you should
provide the necessary GET_* macros?

(regs)->pc looks a bit strange in asm-generic. But please feel free
to ignore.

Oleg.

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