linux-kernel - Re: [PATCH 3/3] omap: add hwspinlock device

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Date:	Tue, 19 Oct 2010 23:02:37 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Kevin Hilman <khilman@...prootsystems.com>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
	Greg KH <greg@...ah.com>, Tony Lindgren <tony@...mide.com>,
	Benoit Cousson <b-cousson@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Hari Kanigeri <h-kanigeri2@...com>, Suman Anna <s-anna@...com>,
	Simon Que <sque@...com>
Subject: Re: [PATCH 3/3] omap: add hwspinlock device

On Tue, Oct 19, 2010 at 7:03 PM, Kevin Hilman
<khilman@...prootsystems.com> wrote:
>> +postcore_initcall(hwspinlocks_init);
>
> Any reason this needs to be a postcore_initcall?  Are there users of
> hwspinlocks this early in boot?

i2c-omap, which is subsys_initcall (the I2C bus is shared between the
A9 and the M3 on some OMAP4 boards).

And to allow early board code to reserve specific hwspinlock numbers
for predefined use-cases, we probably want to be before arch_initcall.

> The I2C   Probaly subsys or even device_initcall
> is more appropriate here.
>
> I would've suspected that any users of hwspinlocks will be dependent on
> drivers for the other cores (e.g. syslink) which would likely be
> initialized much later.
>
> Kevin
>
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