linux-kernel - Re: [PATCH v3] kernel/module.c: need return the first error code to upper caller when error occurs

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Date:	Thu, 23 May 2013 13:24:08 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] kernel/module.c: need return the first error code to upper caller when error occurs

Chen Gang <gang.chen@...anux.com> writes:
> Hello Maintainers:
>
> Please help check the patch whether OK or not, when you have time.

Hi Chen,

        There's nothing *wrong* with the patch, but I don't think it's
worthwhile.  If this were your very first kernel patch, I'd probably
apply it just to encourage you, but you're not a newbie any more!

Cheers,
Rusty.

> On 05/17/2013 12:33 PM, Chen Gang wrote:
>> 
>> When multiple errors occur, simplify_symbols() will return the last
>> error code to the upper caller.
>> 
>> In this case, better to return the first error code to the upper caller.
>> 
>> Just like "using compiler": it will print all errors and warnings as
>> much as it can, but the user usually mainly focus on the first error or
>> warning. Since 'user' only can get one error return code, 'he/she'
>> usually assume the error code will match the first error print line.
>> 
>> 
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  kernel/module.c |    6 ++++--
>>  1 files changed, 4 insertions(+), 2 deletions(-)
>> 
>> diff --git a/kernel/module.c b/kernel/module.c
>> index e4ee1bf..9e6c96d 100644
>> --- a/kernel/module.c
>> +++ b/kernel/module.c
>> @@ -1976,7 +1976,8 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)
>>  			pr_debug("Common symbol: %s\n", name);
>>  			printk("%s: please compile with -fno-common\n",
>>  			       mod->name);
>> -			ret = -ENOEXEC;
>> +			if (!ret)
>> +				ret = -ENOEXEC;
>>  			break;
>>  
>>  		case SHN_ABS:
>> @@ -1999,7 +2000,8 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)
>>  
>>  			printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
>>  			       mod->name, name, PTR_ERR(ksym));
>> -			ret = PTR_ERR(ksym) ?: -ENOENT;
>> +			if (!ret)
>> +				ret = PTR_ERR(ksym) ?: -ENOENT;
>>  			break;
>>  
>>  		default:
>> 
>
>
> -- 
> Chen Gang
>
> Asianux Corporation
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