linux-kernel - Re: parse_args() is too unforgivable?

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Date:	Tue, 25 Aug 2015 10:54:46 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: parse_args() is too unforgivable?

Oleg Nesterov <oleg@...hat.com> writes:
> On 08/24, Oleg Nesterov wrote:
>>
>> I booted the kernel with the additional patch below, and nothing bad has
>> happened,
>
> Until I tried reboot it once with "locktorture.verbose=true" paramater.
> It didn't boot.
>
> This is because parse_args() just aborts after it hits the error, so other
> arguments at the same initcall level are simply ignored.
>
> Fixed by the patch below, but I simply can't believe nobody hit this (imo)
> bug before.
>
> Why does parse_args() do this?? I simply can't understand why parse_args()
> adds more random and hard-to-understand problems if one of the args ("=true"
> in this particular case) is wrong.
>
> Yes, the patch below is probably oversimplified / incomplete but imho the
> current behaviour is confusing. At least I was greatly confused ;) At least
> (I think) it makes sense to let the user know that the rest of command line
> was probably ignored.

This is nice, but please save and return the error properly; modules need
this too.

I think nobody hit this before because they notice that they screwed up
the commandline and it didn't boot.

Thanks,
Rusty.
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