linux-kernel - how exactly is the macro SPIN_LOCK

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Message-ID: <Pine.LNX.4.64.0701160906140.20489@CPE00045a9c397f-CM001225dbafb6>
Date:	Tue, 16 Jan 2007 09:14:58 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: how exactly is the macro SPIN_LOCK_UNLOCKED going to be removed?

  (the following applies equally well to RW_LOCK_UNLOCKED.)

according to Documentation/spinlocks.txt:

======================================
Macros SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED are deprecated and will
be removed soon. So for any new code dynamic initialization should be
used:

   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);
...
======================================

  fair enough, i can see how *some* of that replacement is going to be
done.  new spinlocks can be created based on the macro:

#define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)

  so i'm assuming that the underlying macro __SPIN_LOCK_UNLOCKED is
sticking around.

  also, since defining a spinlock that way requires a lock name,
things like this:

  ...
  .lock           = SPIN_LOCK_UNLOCKED,
  ...

will have to be replaced with the form:

  ...
  .death_lock     = __SPIN_LOCK_UNLOCKED(tcp_death_row.death_lock)
  ...

is that correct so far?  but i'm not sure what's going to happen with
stuff like this:

  spinlock_t cris_atomic_locks[] =
    { [0 ... LOCK_COUNT - 1] = SPIN_LOCK_UNLOCKED};

what's the deal with *that*?  or am i misunderstanding this
completely?

rday
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