linux-kernel - Re: [PATCH] all arches, signal: Move restart_block to struct task

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Message-ID: <20141026183826.GA18348@ravnborg.org>
Date:	Sun, 26 Oct 2014 19:38:27 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, hpa@...or.com
Subject: Re: [PATCH] all arches, signal: Move restart_block to struct
 task_struct

sparc/include/asm/thread_info_32.h b/arch/sparc/include/asm/thread_info_32.h
> index 025c98446b1e..88719dbb12f5 100644
> --- a/arch/sparc/include/asm/thread_info_32.h
> +++ b/arch/sparc/include/asm/thread_info_32.h
> @@ -62,9 +62,6 @@ struct thread_info {
>  	.flags		=	0,			\
>  	.cpu		=	0,			\
>  	.preempt_count	=	INIT_PREEMPT_COUNT,	\
> -	.restart_block	= {				\
> -		.fn	=	do_no_restart_syscall,	\
> -	},						\
>  }
If this is deleted then the corresponding TI_RESTART_BLOCK should go as well


>  
>  #define init_thread_info	(init_thread_union.thread_info)
> diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
> index 798f0279a4b5..a11f1e551a58 100644
> --- a/arch/sparc/include/asm/thread_info_64.h
> +++ b/arch/sparc/include/asm/thread_info_64.h
> @@ -124,9 +124,6 @@ struct thread_info {
>  	.current_ds	=	ASI_P,			\
>  	.exec_domain	=	&default_exec_domain,	\
>  	.preempt_count	=	INIT_PREEMPT_COUNT,	\
> -	.restart_block	= {				\
> -		.fn	=	do_no_restart_syscall,	\
> -	},						\
>  }
When thread_info is modified the relevant TI_ constants needs to be updated.
And TI_RESTART_BLOCK shold be killed as it is no longer relevant.

This stuff is caught only at run-time - and not at build time which would
have been better.

	Sam
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