linux-kernel - Re: [PATCH v2 19/21] bcache: use match

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Message-ID: <36b9f53d-66bd-076e-7c2e-045ca2fd4406@huawei.com>
Date:   Fri, 1 Jun 2018 12:32:00 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Coly Li <colyli@...e.de>, <linux-kernel@...r.kernel.org>
CC:     <andy.shevchenko@...il.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        <linux-bcache@...r.kernel.org>
Subject: Re: [PATCH v2 19/21] bcache: use match_string() helper

Hi Coly,

On 2018/6/1 11:45, Coly Li wrote:
> On 2018/5/31 7:11 PM, Yisheng Xie wrote:
>> match_string() returns the index of an array for a matching string,
>> which can be used instead of open coded variant.
>>
>> Cc: Kent Overstreet <kent.overstreet@...il.com>
>> Cc: linux-bcache@...r.kernel.org 
>> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> 
> Hi Yishenng,
> 
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> submitted a patch to
> replace the whole bch_read_string_list() with __sysfs_match_string().
> And this patch is applied in Jens' block tree, will go into mainline
> kernel in v4.18.
> 
> If you search bcache mailing list, you may find a patch named with
> "bcache: Replace bch_read_string_list() by __sysfs_match_string()".
> 
> That means this patch will conflict with existing changes.

Get it, and thanks for this information.

Sorry Andy, for doing this once more.

Thanks
Yisheng
> 
> Thanks.
> 
> Coly Li
> 
>> ---
>>  drivers/md/bcache/util.c | 9 ++-------
>>  1 file changed, 2 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
>> index 74febd5..cd1f4fd 100644
>> --- a/drivers/md/bcache/util.c
>> +++ b/drivers/md/bcache/util.c
>> @@ -136,22 +136,17 @@ ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[
>>  
>>  ssize_t bch_read_string_list(const char *buf, const char * const list[])
>>  {
>> -	size_t i;
>> +	ssize_t i;
>>  	char *s, *d = kstrndup(buf, PAGE_SIZE - 1, GFP_KERNEL);
>>  	if (!d)
>>  		return -ENOMEM;
>>  
>>  	s = strim(d);
>>  
>> -	for (i = 0; list[i]; i++)
>> -		if (!strcmp(list[i], s))
>> -			break;
>> +	i = match_string(list, -1, s);
>>  
>>  	kfree(d);
>>  
>> -	if (!list[i])
>> -		return -EINVAL;
>> -
>>  	return i;
>>  }
>>  
>>
> 
> 
>