linux-kernel - Re: [PATCH 8/8] Use __kernel_long_t in struct mq

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Message-ID: <20151124043944.GB31047@altlinux.org>
Date:	Tue, 24 Nov 2015 07:39:44 +0300
From:	"Dmitry V. Levin" <ldv@...linux.org>
To:	"H.J. Lu" <hjl.tools@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/8] Use __kernel_long_t in struct mq_attr

On Fri, Dec 27, 2013 at 02:14:24PM -0800, H.J. Lu wrote:
> Both x32 and x86-64 use the same struct mq_attr for system calls.  But
> x32 long is 32-bit. This patch replaces long with __kernel_long_t in
> struct mq_attr.
> 
> Signed-off-by: H.J. Lu <hjl.tools@...il.com>
> ---
>  include/uapi/linux/mqueue.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/uapi/linux/mqueue.h b/include/uapi/linux/mqueue.h
> index 8b5a796..d0a2b8e 100644
> --- a/include/uapi/linux/mqueue.h
> +++ b/include/uapi/linux/mqueue.h
> @@ -23,11 +23,11 @@
>  #define MQ_BYTES_MAX	819200
>  
>  struct mq_attr {
> -	long	mq_flags;	/* message queue flags			*/
> -	long	mq_maxmsg;	/* maximum number of messages		*/
> -	long	mq_msgsize;	/* maximum message size			*/
> -	long	mq_curmsgs;	/* number of messages currently queued	*/
> -	long	__reserved[4];	/* ignored for input, zeroed for output */
> +	__kernel_long_t	mq_flags;	/* message queue flags			*/
> +	__kernel_long_t	mq_maxmsg;	/* maximum number of messages		*/
> +	__kernel_long_t	mq_msgsize;	/* maximum message size			*/
> +	__kernel_long_t	mq_curmsgs;	/* number of messages currently queued	*/
> +	__kernel_long_t	__reserved[4];	/* ignored for input, zeroed for output */
>  };
>  
>  /*

This breaks userspace, please #include <linux/types.h>
before using __kernel_long_t.


-- 
ldv

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