linux-kernel - Re: [PATCH v3] printk: allow increasing the ring buffer depending on the number of CPUs

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Message-ID: <20140614184807.GE4841@wotan.suse.de>
Date:	Sat, 14 Jun 2014 20:48:07 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, hpa@...ux.intel.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Michal Hocko <mhocko@...e.cz>, Petr Mladek <pmladek@...e.cz>,
	Joe Perches <joe@...ches.com>,
	Arun KS <arunks.linux@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: Re: [PATCH v3] printk: allow increasing the ring buffer depending
	on the number of CPUs

It turns out we can't use num_possible_cpus() that early on boot, as
it hasn't yet been properly set, nor other helpers, a late setup for
big CPUs is therefore needed in order to use num_possible_cpus().
That also means we can use kzalloc() instead. I'll send a v4 and
I think we should test this a bit so will send as RFT.

  Luis
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