linux-kernel - Re: [PATCH] printk: Make printk

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Date:   Fri, 23 Nov 2018 22:25:04 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: Make printk_emit() local function.

On 2018/11/23 21:24, Petr Mladek wrote:
> On Thu 2018-11-22 23:59:28, Tetsuo Handa wrote:
>> printk_emit() is called from only devkmsg_write() in the same file.
>> Save object size by making it a local function.
>>
>> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>> ---
>>  include/linux/printk.h |  5 -----
>>  kernel/printk/printk.c | 31 +++++++++++++++----------------
>>  2 files changed, 15 insertions(+), 21 deletions(-)
>>
>> --- a/kernel/printk/printk.c
>> +++ b/kernel/printk/printk.c
>> @@ -752,6 +752,20 @@ struct devkmsg_user {
>>  	char buf[CONSOLE_EXT_LOG_MAX];
>>  };
>>  
>> +static __printf(3, 4) __cold int devkmsg_emit(int facility, int level,
>> +					      const char *fmt, ...);
> 
> There is no need for the forward declaration. __printf(3, 4)
> and __cold could be part of the function definition.
> Or do I miss anything?

If you meant below one, it fails with "error: expected ',' or ';' before '{' token".
Attributes annotation needs to be done as the prototype definition.
(Though I don't know whether __cold here makes sense...)

static int devkmsg_emit(int facility, int level, const char *fmt, ...)
__printf(3, 4) __cold
{
        va_list args;
        int r;

        va_start(args, fmt);
        r = vprintk_emit(facility, level, NULL, 0, fmt, args);
        va_end(args);

        return r;
}