linux-kernel - Re: [PATCH, RFC] shmat: introduce flag SHM_MAP

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Message-Id: <20081007195837.5A6B.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue,  7 Oct 2008 20:08:19 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH, RFC] shmat: introduce flag SHM_MAP_HINT

> It allows interpret attach address as a hint, not as exact address.
> 
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Andi Kleen <andi@...stfloor.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arjan van de Ven <arjan@...radead.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  include/linux/shm.h |    1 +
>  ipc/shm.c           |    4 ++--
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/shm.h b/include/linux/shm.h
> index eca6235..2a637b8 100644
> --- a/include/linux/shm.h
> +++ b/include/linux/shm.h
> @@ -55,6 +55,7 @@ struct shmid_ds {
>  #define	SHM_RND		020000	/* round attach address to SHMLBA boundary */
>  #define	SHM_REMAP	040000	/* take-over region on attach */
>  #define	SHM_EXEC	0100000	/* execution access */
> +#define	SHM_MAP_HINT	0200000	/* interpret attach address as a hint */

hmm..
Honestly, I don't like that qemu specific feature insert into shmem core.
At least, this patch is too few comments.
Therefore, an develpper can't understand why SHM_MAP_HINT exist.

I think this patch description is too short and too poor.
I don't like increasing mysterious interface.


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