linux-kernel - Re: Clock register in early init

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Message-ID: <CAJOA=zM1KsUKg=xcuF+Md=1UN9EsmB4vAWSK3gch2PKXK=zweQ@mail.gmail.com>
Date:	Thu, 24 May 2012 08:51:03 -0700
From:	"Turquette, Mike" <mturquette@...com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Clock register in early init

On Wed, May 23, 2012 at 6:02 PM, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Tue, May 22, 2012 at 10:37:15AM -0700, Turquette, Mike wrote:
>> On Tue, May 22, 2012 at 5:08 AM, Peter De Schrijver
>> <pdeschrijver@...dia.com> wrote:
>> >> We had at-least that on the older Samsung parts and they where still
>> >> growing. I would suggest that in a multi-kernel image situation the
>> >> more data that can be discarded after init-time the better.
>> >>
>> >> Also, __initdata gets gathered into one place so there's no possibility
>> >> of page fragmentation there. If you mean fragmentation of the memory
>> >> map, then allocate the size of all the clocks you know of at init time
>> >> in one go.
>> >>
>> >
>> > That would work, except that clocks are needed before kmalloc is available.
>> >
>>
>> Is static initialization the only way to solve this problem?  What
>> about using the bootmem allocator for early init clocks?
>>
> This is what sh does for its asm/clkdev.h __clkdev_alloc(), which is
> really the only difference over the ARM version. It always seemed a bit
> silly to me to make early allocation an arch-specific property.

Good point.  clkdev will probably need to be bootmem-able as well as
the common clk stuff.

Regards,
Mike
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