linux-kernel - Re: [PATCH] earlyprintk: re-enable earlyprintk calling early

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Date:	Mon, 18 Aug 2014 12:13:38 +0900
From:	Sahara <keun-o.park@...driver.com>
To:	Rusty Russell <rusty@...tcorp.com.au>, <kpark3469@...il.com>,
	<akpm@...ux-foundation.org>
CC:	<hpa@...or.com>, <rafael.j.wysocki@...el.com>,
	<peterz@...radead.org>, <kirill.shutemov@...ux.intel.com>,
	<oleg@...hat.com>, <prarit@...hat.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] earlyprintk: re-enable earlyprintk calling early_param


2014년 08월 16일 03:34, Rusty Russell 쓴 글:
> kpark3469@...il.com writes:
>> From: Sahara <keun-o.park@...driver.com>
>>
>> Although there are many obs_kernel_param and its names are
>> earlyprintk and also EARLY_PRINTK is also enabled, we could not
>> see the early_printk output properly until now. This patch
>> considers earlycon as well as earlyprintk.
> Hmm, the initial "earlycon" hack slipped in when I wasn't looking.
> I don't think we should extend it.
>
> Why not make the thing(s) you want early_param()s?
>
> Cheers,
> Rusty.
The earlycon and the earlyprintk are scattered and used in many 
architectures.
It looks earlycon just could be a subset of earlyprintk.
The earlycon is for uart specific, while the earlyprintk is to support 
vga, efi, xen, serial, and so on. Especially ARM uses earlyprintk in 
many places. And, I am not sure if this is a good chance to replace all 
the earlyprintk with the earlycon. As of now, it's fair for both 
earlycon and earlyprintk.
Or perhaps removing case#2, see in my previous email to Andrew Morton, 
is better?, so users be forced to specify earlycon and earlyprintk in 
cmdline if they want to see early_printk() output.

Thanks.

Best Regards,
Sahara.

>
>> --- a/init/main.c
>> +++ b/init/main.c
>> @@ -426,7 +426,8 @@ static int __init do_early_param(char *param, char *val, const char *unused)
>>   	for (p = __setup_start; p < __setup_end; p++) {
>>   		if ((p->early && parameq(param, p->str)) ||
>>   		    (strcmp(param, "console") == 0 &&
>> -		     strcmp(p->str, "earlycon") == 0)
>> +		     ((strcmp(p->str, "earlycon") == 0) ||
>> +		     (strcmp(p->str, "earlyprintk") == 0)))
>>   		) {
>>   			if (p->setup_func(val) != 0)
>>   				pr_warn("Malformed early option '%s'\n", param);
>> -- 
>> 1.7.9.5

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