linux-kernel - Re: Spinlock init

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Message-ID: <ada4pl29xph.fsf@cisco.com>
Date:	Wed, 20 Jun 2007 13:29:14 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Jack Stone <jack@...keye.stone.uk.eu.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Spinlock init

 > 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.

 - R.
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