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

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Date:	Mon, 11 Mar 2013 16:16:43 +0000
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] xen-blkback: Change statistics counter types to unsigned

Done, just sent in in separate mail.

On 08/03/13 18:43, Konrad Rzeszutek Wilk wrote:
> 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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View attachment "0001-xen-blkback-Change-statistics-counter-types-to-unsig.patch" of type "text/x-patch" (3193 bytes)