linux-kernel - Re: [PATCH] Add initcall_blacklist kernel parameter [v2]

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Message-ID: <53396F4D.50402@redhat.com>
Date:	Mon, 31 Mar 2014 09:36:13 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel@...r.kernel.org,
	Josh Boyer <jwboyer@...oraproject.org>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH] Add initcall_blacklist kernel parameter [v2]



On 03/31/2014 09:04 AM, Andi Kleen wrote:
>>  		do_initcall_level(level);
>> +
>> +	list_for_each_safe(tmp, next, &blacklisted_initcalls) {
>> +		entry = list_entry(tmp, struct blacklist_entry, next);
>> +		free_bootmem(entry->buf, strlen(entry->buf));
>> +		free_bootmem(entry, sizeof(*entry));
> 
> Does that really work? At this point the bootmem allocator should
> be already finished, so no memory will be freed.

Oh, geez ... that's a good point.  I completely missed that.

> 
> For this case it's probably ok to leak it.

Okay ... maybe that's an option.

> 
> Alternatively you could use static arrays and storing pointer/len.
> 

Yeah, I was thinking about the pros-cons of doing static vs. dynamic.  I was
planning on doing an array of 5 but kept falling into the trap of "how much is
too much or too little?".

Does anyone object to a static array?  If not I'll bang out a static version for
[v3] tomorrow ...

P.

> -Andi
> 
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