linux-kernel - Re: [PATCH] block: sysfs fix mismatched queue_var

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Date:	Tue, 14 Jul 2009 23:00:30 +0800
From:	Danny Feng <dfeng@...hat.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: sysfs fix mismatched queue_var_{store,show} in
 	64bit kernel

On 07/14/2009 09:53 PM, Américo Wang wrote:
> On Tue, Jul 14, 2009 at 7:56 PM, Xiaotian Feng<dfeng@...hat.com> wrote:
>> In blk-sysfs.c, queue_var_store uses unsigned long to store data,
>> but queue_var_show uses unsigned int to show data. This causes,
>>
>>        # echo 70000000000 > /sys/block/<dev>/queue/read_ahead_kb
>>        # cat /sys/block/<dev>/queue/read_ahead_kb => get wrong value
>>
>> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
>> ---
>>  block/blk-sysfs.c |   13 +++++++------
>>  1 files changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
>> index b1cd040..e177eb3 100644
>> --- a/block/blk-sysfs.c
>> +++ b/block/blk-sysfs.c
>> @@ -16,9 +16,9 @@ struct queue_sysfs_entry {
>>  };
>>
>>  static ssize_t
>> -queue_var_show(unsigned int var, char *page)
>> +queue_var_show(unsigned long var, char *page)
>>  {
>> -       return sprintf(page, "%d\n", var);
>> +       return sprintf(page, "lu\n", var);
>
>
> %lu
>
My mistake, correct in V2. Thank you.
>>   }
>>
>>   static ssize_t
>> @@ -77,7 +77,8 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count)
>>
>>   static ssize_t queue_ra_show(struct request_queue *q, char *page)
>>   {
>> -       int ra_kb = q->backing_dev_info.ra_pages<<  (PAGE_CACHE_SHIFT - 10);
>> +       unsigned long ra_kb = q->backing_dev_info.ra_pages<<
>> +                                       (PAGE_CACHE_SHIFT - 10);
>
>
> It looks like that your email client replaces tab's with spaces.
I use git send-email, and in my thunderbird, they're all tabs...
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