linux-kernel - Re: [PATCH] x86/asm/entry/64: Merge the field offset into the THREAD

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Message-ID: <5511B1EA.1000100@redhat.com>
Date:	Tue, 24 Mar 2015 19:50:18 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/asm/entry/64: Merge the field offset into the THREAD_INFO()
 macro

On 03/24/2015 07:44 PM, Ingo Molnar wrote:
> From 11e2761ba0969466299b7109eba749d2292e8796 Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@...nel.org>
> Date: Tue, 24 Mar 2015 19:18:41 +0100
> Subject: [PATCH] x86/asm/entry/64: Merge the field offset into the THREAD_INFO() macro
> 
> Before:
> 
>    TI_sysenter_return+THREAD_INFO(%rsp,3*8),%r10d
> 
> After:
> 
>    movl    THREAD_INFO(TI_sysenter_return, %rsp, 3*8), %r10d
> 
> to turn it into a clear thread_info accessor.

Good idea, I also wanted to do this.
I propose a more C-like order of arguments instead.
In C, field names are on the right: obj.field, ptr->field.

    THREAD_INFO(%rsp, 3*8, TI_field_name)

would suggest to the reader a pseudo-C construct:

    THREAD_INFO(sp, offset)->field_name

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