-Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
-__SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate for static
-initialization.
-
-Dynamic initialization, when necessary, may be performed as
-demonstrated below.
-
- spinlock_t xxx_lock;
- rwlock_t xxx_rw_lock;
-
- static int __init xxx_init(void)
- {
- spin_lock_init(&xxx_lock);
- rwlock_init(&xxx_rw_lock);
- ...
- }
-
- module_init(xxx_init);
-
-The following discussion is still valid, however, with the dynamic
-initialization of spinlocks or with DEFINE_SPINLOCK, etc., used
-instead of SPIN_LOCK_UNLOCKED.
-
------------------------
-
-On Fri, 2 Jan 1998, Doug Ledford wrote:
->
-> I'm working on making the aic7xxx driver more SMP friendly (as well as
-> importing the latest FreeBSD sequencer code to have 7895 support) and wanted
-> to get some info from you. The goal here is to make the various routines
-> SMP safe as well as UP safe during interrupts and other manipulating
-> routines. So far, I've added a spin_lock variable to things like my queue
-> structs. Now, from what I recall, there are some spin lock functions I can
-> use to lock these spin locks from other use as opposed to a (nasty)
-> save_flags(); cli(); stuff; restore_flags(); construct. Where do I find
-> these routines and go about making use of them? Do they only lock on a
-> per-processor basis or can they also lock say an interrupt routine from
-> mucking with a queue if the queue routine was manipulating it when the
-> interrupt occurred, or should I still use a cli(); based construct on that
-> one?
-
-See <asm/spinlock.h>. The basic version is:
-
- spinlock_t xxx_lock = SPIN_LOCK_UNLOCKED;