linux-kernel - Re: Spinlock init

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Date:	Wed, 20 Jun 2007 21:31:29 +0100
From:	Jack Stone <jack@...keye.stone.uk.eu.org>
To:	Roland Dreier <rdreier@...co.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Spinlock init

Roland Dreier wrote:
>  > can rwlock_init and spin_lock_init be used outside of functions declared
>  > __init. The spinlock documentation suggests that it can't but I'd like
>  > someone to confirm that.
> 
> Those function can be used in any function.  A function is declared
> __init if it only runs during the kernel startup, so that the memory
> holding the code for __init functions can be freed once startup is
> done.  However, spin_lock_init() is just used to initialize a freshly
> allocated spinlock, and spinlocks may be allocated at any time, even
> long after the kernel is done starting up.  A quick look throught
> kernel source code will show many, many examples where
> spin_lock_init(), rwlock_init(), mutex_init(), etc. are called from
> non-__init functions.

Exactly what I wanted to hear. Thank you very much.

Jack

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