linux-kernel - Re: [PATCH 1/2] Move the pt_regs_offset struct definition from arch to common include file

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Date:	Tue, 16 Jun 2015 08:17:47 -0500
From:	Rob Herring <robherring2@...il.com>
To:	David Long <dave.long@...aro.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Anton Blanchard <anton@...ba.org>,
	Behan Webster <behanw@...verseincode.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Eric Paris <eparis@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Jan Willeke <willeke@...ibm.com>,
	Kees Cook <keescook@...omium.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Richard Kuo <rkuo@...eaurora.org>,
	Robert Richter <rric@...nel.org>,
	Roland McGrath <roland@...k.frob.com>,
	Russell King <linux@....linux.org.uk>,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-hexagon@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-s390@...r.kernel.org, SH-Linux <linux-sh@...r.kernel.org>,
	linux390@...ibm.com, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 1/2] Move the pt_regs_offset struct definition from arch
 to common include file

On Mon, Jun 15, 2015 at 11:42 AM, David Long <dave.long@...aro.org> wrote:
> From: "David A. Long" <dave.long@...aro.org>
>
> The pt_regs_offset structure is used for HAVE_REGS_AND_STACK_ACCESS_API
>  feature and has identical definitions in four different arch ptrace.h
> include files. It seems unlikely that definition would ever need to be
> changed regardless of architecture so lets move it into
> include/linux/ptrace.h.
>
> Signed-off-by: David A. Long <dave.long@...aro.org>
> ---
>  arch/arm/kernel/ptrace.c     | 5 -----
>  arch/powerpc/kernel/ptrace.c | 5 -----
>  arch/sh/include/asm/ptrace.h | 5 -----
>  arch/x86/kernel/ptrace.c     | 5 -----
>  include/linux/ptrace.h       | 9 +++++++++
>  5 files changed, 9 insertions(+), 20 deletions(-)
>
> diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
> index ef9119f..fb45cf1 100644
> --- a/arch/arm/kernel/ptrace.c
> +++ b/arch/arm/kernel/ptrace.c
> @@ -59,11 +59,6 @@
>  #define BREAKINST_THUMB        0xde01
>  #endif
>
> -struct pt_regs_offset {
> -       const char *name;
> -       int offset;
> -};
> -
>  #define REG_OFFSET_NAME(r) \
>         {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)}
>  #define REG_OFFSET_END {.name = NULL, .offset = 0}

Can't you also move these? ARM is complicated with the "ARM_"
prefixing, but the others appear to be the same. Maybe you can remove
the prefix or redefine the macro for ARM.

Rob
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