linux-kernel - Re: [CRIU] [PATCH 2/4] ipc: move all checkpoint-restore code under appropriate define

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Date:	Mon, 09 Apr 2012 23:47:43 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"serge.hallyn@...onical.com" <serge.hallyn@...onical.com>,
	"criu@...nvz.org" <criu@...nvz.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"mtk.manpages@...il.com" <mtk.manpages@...il.com>
Subject: Re: [CRIU] [PATCH 2/4] ipc: move all checkpoint-restore code under
 appropriate define

On 04/09/2012 09:54 PM, Stanislav Kinsbursky wrote:
> All new checkpoint/restore code parts are now covered with
> CONFIG_CHECKPOINT_RESTORE marco. So it would be easy to remove them, in case
> the whole project fails.
> 
> ---
>  ipc/compat.c |    9 ++++++---
>  ipc/msg.c    |   15 ++++++++++++++-
>  2 files changed, 20 insertions(+), 4 deletions(-)
> 
> @@ -387,8 +388,10 @@ long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
>  		msgtyp = ipck.msgtyp;
>  	}
>  	return do_msgrcv(first, uptr, second, msgtyp, third,
> -			 (third & MSG_PEEK_ALL) ? compat_do_msg_peek_all
> -						: compat_do_msg_fill);
> +#ifdef CONFIG_CHECKPOINT_RESTORE
> +			 (third & MSG_PEEK_ALL) ? compat_do_msg_peek_all :
> +#endif
> +						compat_do_msg_fill);

These ifdefs in the middle of the code look not very elegant. Is there a way
to replace the checks they surround with static inline function (reporting
0 when CHECKPOINT_RESTORE is off) potentially letting the compiler optimize
out the code sitting under if (0) ?

>  }
>  
>  static inline int get_compat_msqid64(struct msqid64_ds *m64,
> diff --git a/ipc/msg.c b/ipc/msg.c
> index 017bf0b..8d63cc7 100644
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