Messages in this thread | | | Subject | Re: Spinlock init | From | Roland Dreier <> | Date | Wed, 20 Jun 2007 13:29:14 -0700 |
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> 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.
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