Re: [PATCH] ipc 1/3: Add refcount to ipc_rcu_alloc

[Andrew Morton <akpm@osdl.org>]

Manfred Spraul <manfred@colorfullife.com> wrote:
>
> +struct ipc_rcu_hdr
>  +{
>  +	int refcount;
>  +	int is_vmalloc;
>  +	void *data[0];
>  +};

That's not what I meant ;)

struct ipc_rcu_hdr
{
	int refcount;
	int is_vmalloc;
};

Then place one of these inside struct msg_queue, one inside struct
sem_array, etc.

#define ipc_rcu_putref(p)
	if (--p->rcu_hdr.refcount == 0)
		ipc_rcu_putref_final(p, &p->rcu_hdr)

or whatever.

That's assuming struct kref isn't suitable.  I guess you don't want the
atomic_t.