linux-kernel - Re: [PATCH 3/3] user.c: #ifdef ->mq

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Date:	Fri, 21 Sep 2007 11:55:50 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...ru>
CC:	akpm@...l.org, linux-kernel@...r.kernel.org, devel@...nvz.org
Subject: Re: [PATCH 3/3] user.c: #ifdef ->mq_bytes

Hello Alexey !

Alexey Dobriyan wrote:
> for those who deselect POSIX message queues.
> 
> Reduces SLAB size of user_struct from 64 to 32 bytes here,
> SLUB size -- from 40 bytes to 32 bytes.
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...ru>
> ---
> 
>  include/linux/sched.h |    2 ++
>  kernel/user.c         |    2 --
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -583,8 +583,10 @@ struct user_struct {
>  	atomic_t inotify_watches; /* How many inotify watches does this user have? */
>  	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
>  #endif
> +#ifdef CONFIG_POSIX_MQUEUE
>  	/* protected by mq_lock	*/
>  	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
> +#endif
>  	unsigned long locked_shm; /* How many pages of mlocked shm ? */

while you are it, it seems possible to #ifdef locked_shm also. it's a bit more 
complex because the code is mm/ and there are some links with the hugetlbfs 
also.

Cheers,

C.

>  #ifdef CONFIG_KEYS
> --- a/kernel/user.c
> +++ b/kernel/user.c
> @@ -44,7 +44,6 @@ struct user_struct root_user = {
>  	.processes	= ATOMIC_INIT(1),
>  	.files		= ATOMIC_INIT(0),
>  	.sigpending	= ATOMIC_INIT(0),
> -	.mq_bytes	= 0,
>  	.locked_shm     = 0,
>  #ifdef CONFIG_KEYS
>  	.uid_keyring	= &root_user_keyring,
> 
> -
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