linux-kernel - Re: [patch 2/4] [RFC] syscalls, x86: Add __NR

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Date:	Tue, 24 Jan 2012 13:46:31 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Cyrill Gorcunov <gorcunov@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>, Valdis.Kletnieks@...edu
Subject: Re: [patch 2/4] [RFC] syscalls, x86: Add __NR_kcmp syscall v4

On 01/24/2012 01:45 PM, Andrew Morton wrote:
> On Tue, 24 Jan 2012 13:22:22 -0800
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
>> static int kcmp_task_pointers(void *task1, void *task2, size_t field_offset,
>> 				enum you_forgot_to_name_the_enum type)
>> {
>> 	void **field1 = t1 + field_offset;	/* points to a pointer in the task_struct */
>> 	void **field2 = t1 + field_offset;
> 
> On reflection, this was being too cute.  It would be better to make the
> function type-safer and just put up with the local typecasts:
> 
> static int kcmp_task_pointers(struct task_struct *task1,
> 			struct task_struct *task2, size_t field_offset,
> 			enum you_forgot_to_name_the_enum type)
> {
> 	void **field1 = (void *)t1 + field_offset;
> 	void **field2 = (void *)t2 + field_offset;
> 

Arithmetic on void pointers?

	-hpa

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