linux-kernel - Re: [PATCH 1/2] utrace core

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Message-ID: <20080830150545.GA29686@x200.localdomain>
Date:	Sat, 30 Aug 2008 19:05:45 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] utrace core

On Tue, Aug 26, 2008 at 03:01:57PM -0700, Roland McGrath wrote:
> +/**
> + * struct utrace_attached_engine - per-engine structure
> + * @ops:	&struct utrace_engine_ops pointer passed to utrace_attach_task()
> + * @data:	engine-private &void * passed to utrace_attach_task()
> + * @flags:	event mask set by utrace_set_events() plus internal flag bits
> + *
> + * The task itself never has to worry about engines detaching while
> + * it's doing event callbacks.  These structures are removed from the
> + * task's active list only when it's stopped, or by the task itself.
> + *
> + * utrace_engine_get() and utrace_engine_put() maintain a reference count.
> + * When it drops to zero, the structure is freed.  One reference is held
> + * implicitly while the engine is attached to its task.
> + */
> +struct utrace_attached_engine {
> +/* private: */
> +	struct kref kref;

Engine grew a refcount.

Was it added to fix some bug?

Old utrace git doesn't have this, new utrace git has only two
posted patches, so asking.

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