linux-kernel - Re: [PATCH 1/1] xen-blkback: Change statistics counter types to unsigned

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Message-ID: <20130308184301.GA31104@phenom.dumpdata.com>
Date:	Fri, 8 Mar 2013 13:43:01 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] xen-blkback: Change statistics counter types to
 unsigned

On Tue, Mar 05, 2013 at 05:59:32PM +0000, Zoltan Kiss wrote:
> These values shouldn't be negative, but after an overflow their value
> can turn into negative, if they are signed. xentop can show bogus
> values in this case.

I get this during compilation:

/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_oo_req’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:233: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_rd_req’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:234: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_wr_req’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:235: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_f_req’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:236: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_ds_req’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:237: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_rd_sect’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:238: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c: In function ‘show_wr_sect’:
/home/konrad/linux/drivers/block/xen-blkback/xenbus.c:239: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
  CC      block/bsg-lib.o
  CC      mm/dmapool.o
  CC      kernel/debug/debug_core.o
  CC      mm/hugetlb.o
  CC      mm/mempolicy.o
  CC      drivers/acpi/sleep.o
/home/konrad/linux/drivers/block/xen-blkback/blkback.c: In function ‘print_stats’:
/home/konrad/linux/drivers/block/xen-blkback/blkback.c:384: warning: format ‘%3d’ expects type ‘int’, but argument 3 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/blkback.c:384: warning: format ‘%4d’ expects type ‘int’, but argument 4 has type ‘long long unsigned int’
/home/konrad/linux/drivers/block/xen-blkback/blkback.c:384: warning: format ‘%4d’ expects type ‘int’, but argument 5 has type ‘lo

Could you fix it up please as one big patch if possible?

> 
> Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
> Reported-by: Ichiro Ogino <ichiro.ogino@...rix.co.jp>
> ---
>  drivers/block/xen-blkback/common.h |   14 +++++++-------
>  1 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
> index 6072390..72d09ac 100644
> --- a/drivers/block/xen-blkback/common.h
> +++ b/drivers/block/xen-blkback/common.h
> @@ -208,13 +208,13 @@ struct xen_blkif {
>  
>  	/* statistics */
>  	unsigned long		st_print;
> -	int			st_rd_req;
> -	int			st_wr_req;
> -	int			st_oo_req;
> -	int			st_f_req;
> -	int			st_ds_req;
> -	int			st_rd_sect;
> -	int			st_wr_sect;
> +	unsigned long long			st_rd_req;
> +	unsigned long long			st_wr_req;
> +	unsigned long long			st_oo_req;
> +	unsigned long long			st_f_req;
> +	unsigned long long			st_ds_req;
> +	unsigned long long			st_rd_sect;
> +	unsigned long long			st_wr_sect;
>  
>  	wait_queue_head_t	waiting_to_free;
>  };
> -- 
> 1.7.0.4
> 
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