Re: [PATCH] tracing: Do PTR_ERR() after IS_ERR()

[李力琼]

在 2022/7/30 00:56, Steven Rostedt 写道:
> On Thu, 28 Jul 2022 08:28:08 +0800
> liqiong <liqiong@xxxxxxxxxxxx> wrote:
>
> > It's all right, assign  PTR_ERR()  to 'ret'  anyway.
> > But this assignment is valid only at the "IS_ERR()" path.
> > Maybe it is better put "PTR_ERR()" at error path, keep the code clear.
> No it does not. It adds unnecessary brackets.
>
> It is common in the kernel to have:
>
> 	ret = ERROR;
> 	if (some_condition())
> 		goto out;
>
> 	ret = ERROR1;
> 	if (some_other_condition())
> 		goto out;
>
> 	ret = ERROR2;
> 	if (some_new_condition())
> 		goto out;
>
> 	ret = 0;
> out:
> 	return ret;
>
> And your change breaks this.
>
> -- Steve

I got it, Thanks.