Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Iau, 2005-12-15 at 16:41 +0300, Nikita Danilov wrote:
> But this change is about fixing bugs: mutex assumes that
> 
>  - only owner can unlock, and
> 
>  - owner cannot lock (immediate self-deadlock).

So add mutex_up/mutex_down that use the same semaphores but do extra
checks if lock debugging is enabled. All you need is an owner field for
debugging.

Now generate a trace dump on up when up and to check for sleeping on a
lock you already hold (for both sem and mutex).

Alan

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