Re: [PATCH 3/4] IPMI: convert locked counters to atomics

[Andrew Morton <akpm@linux-foundation.org>]

> +	for (i = 0; i < IPMI_NUM_STATS; i++)
> +		atomic_set(&intf->stats[i], 0);

And this is why it would be very hard for any architecture to ever
implement atomic_t as

struct atomic_t {
	int counter;
	spinlock_t lock;
};

The interface assumes that atomic_set() fully initialises the atomic_t, and
that atomic_set() can be used agaisnt both an uninitialised atomic_t and
against an already-initialised atomic_t.  IOW, we don't have atomic_init().

So would our hypothetical future architcture's atomic_set() do spin_lock(),
or would it do spin_lock_init()?  Either one is wrong in many atomic_set
callsites.

Oh well.