linux-kernel - Re: [PATCH 02/02] clk: clk-of: Use alloc

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Date:	Thu, 21 Jun 2012 21:18:44 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Chris Ball <cjb@...top.org>
Cc:	Rob Herring <robherring2@...il.com>,
	Mitch Bradley <wmb@...top.org>, mturquette@...aro.org,
	devicetree-discuss@...ts.ozlabs.org, sboyd@...eaurora.org,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	skannan@...eaurora.org, shawn.guo@...aro.org,
	s.hauer@...gutronix.de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 02/02] clk: clk-of: Use alloc_bootmem() instead of
 kzalloc()

On Thu, Jun 21, 2012 at 03:32:04AM -0400, Chris Ball wrote:
> When of_clk_add_provider() is used at boot time (during .init_early on
> ARM, in the motivating case for this patch), kzalloc() cannot be used
> because slab isn't up yet.
> 
> Signed-off-by: Chris Ball <cjb@...top.org>

I wouldn't use alloc_bootmem() unconditionally for this, as you have no
idea where other platforms may wire the call site up. slab is also
available a lot earlier now than it used to be, so many places that
required bootmem pages previously can get away with slab allocations now.

You could rework this as:

	if (slab_is_available())
		cp = kzalloc(...)
	else
		cp = alloc_bootmem(...)

and then it doesn't matter when and where it gets called.
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