linux-kernel - Re: [patch 1/2] kcmp: Make it to depend on CONFIG

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Date:	Tue, 19 Feb 2013 13:42:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	ebiederm@...ssion.com, xemul@...allels.com,
	Andrey Vagin <avagin@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [patch 1/2] kcmp: Make it to depend on CONFIG_KCMP

On Tue, 19 Feb 2013 22:28:38 +0400
Cyrill Gorcunov <gorcunov@...nvz.org> wrote:

> Since kcmp syscall has been implemented (initially on
> x86 architecture) a number of other archs wire it up
> as well: xtensa, sparc, sh, s390, mips, microblaze,
> m68k (not taking into account those who uses
> <asm-generic/unistd.h> for syscall numbers
> definitions).
> 
> But the Makefile, which turns kcmp.o generation on
> still depends on former config-x86. Thus get rid
> of this limitation and make kcmp.o depend on CONFIG_KCMP
> option.
> 
> ...
>
> --- linux-2.6.git.orig/init/Kconfig
> +++ linux-2.6.git/init/Kconfig
> @@ -279,6 +279,15 @@ config FHANDLE
>  	  get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)
>  	  syscalls.
>  
> +config KCMP
> +	bool "kcmp syscall"
> +	default CHECKPOINT_RESTORE
> +	help
> +	  If you say Y here, a user level program will be able to use
> +	  kcmp(2) syscall.
> +
> +	  If unsure, say Y.
> +
>  config AUDIT
>  	bool "Auditing support"
>  	depends on NET
> Index: linux-2.6.git/kernel/Makefile
> ===================================================================
> --- linux-2.6.git.orig/kernel/Makefile
> +++ linux-2.6.git/kernel/Makefile
> @@ -25,9 +25,7 @@ endif
>  obj-y += sched/
>  obj-y += power/
>  
> -ifeq ($(CONFIG_CHECKPOINT_RESTORE),y)
> -obj-$(CONFIG_X86) += kcmp.o
> -endif
> +obj-$(CONFIG_KCMP) += kcmp.o
>  obj-$(CONFIG_FREEZER) += freezer.o
>  obj-$(CONFIG_PROFILING) += profile.o
>  obj-$(CONFIG_STACKTRACE) += stacktrace.o

This permits people to select kcmp with CONFIG_CHECKPOINT_RESTORE=n. 
Is there any point in doing that?

What would be wrong with just doing

	obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o

?

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