linux-kernel - Re: 回复: [PATCH] bcache: replace snprintf in show functions with sysfs

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Message-ID: <fff14784-aadf-d7b0-3aed-e2428b1a7b54@suse.de>
Date:   Wed, 13 Oct 2021 15:51:24 +0800
From:   Coly Li <colyli@...e.de>
To:     王擎 <wangqing@...o.com>
Cc:     "linux-bcache@...r.kernel.org" <linux-bcache@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 回复: [PATCH] bcache: replace snprintf in show functions with sysfs_emit

On 10/13/21 3:39 PM, 王擎 wrote:
>>> diff --git a/drivers/md/bcache/sysfs.h b/drivers/md/bcache/sysfs.h
>>> index 215df32..8bec32d 100644
>>> --- a/drivers/md/bcache/sysfs.h
>>> +++ b/drivers/md/bcache/sysfs.h
>>> @@ -51,7 +51,7 @@ STORE(fn)                                                           \
>>>     #define sysfs_printf(file, fmt, ...)                                        \
>>>     do {                                                                        \
>>>          if (attr == &sysfs_ ## file)                                    \
>>> -             return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__); \
>>> +             return sysfs_emit(buf, fmt "\n", __VA_ARGS__);  \
>>>     } while (0)
>>>     
>>>     #define sysfs_print(file, var)                                              \
>> IMHO I like this change :-) BTW, for snprint() from util.h, it seems
>> only to be used by sysfs_print() in syfs.h, would you like to change it
>> to use sysfs_emit too ?
>>
>> Thanks for the patch.
>>
>> Coly Li
>>
> sysfs_print() should also be modified if size is a fixed value PAGE_SIZE,
> but here is param, it would be appreciate if you have better method.

Yes, I meant you may implement sysfs_print() by sysfs_emit() directly in 
the way as snprint() does. Then you may remove snprint() since no one 
uses it any more.

Coly Li