Re: PI BUG with -rt13

[Ingo Molnar <mingo@elte.hu>]

* David Singleton <dsingleton@mvista.com> wrote:

> Ingo,
>    here is a patch that provides the correct locking for the rt_mutex 
> backing the robust pthread_mutex.   The patch also unifies the locking 
> for all the robust functions and adds support for pthread_mutexes on 
> the heap.

thanks. Could you split up the patch into a fix and a 'heap' patch (at a 
minimum)?

it's this portion of the 'heap' patch that looks problematic:

> --- base/linux-2.6.14/include/linux/mm.h	2005-11-18 20:36:53.000000000 -0800
> +++ wip/linux-2.6.14/include/linux/mm.h	2005-11-21 10:51:19.000000000 -0800
> @@ -109,6 +109,11 @@
>  #ifdef CONFIG_NUMA
>  	struct mempolicy *vm_policy;	/* NUMA policy for the VMA */
>  #endif
> +#ifdef CONFIG_FUTEX
> +	int robust_init;		/* robust initialized? */
> +	struct list_head robust_list;	/* list of robust futexes in this vma */
> +	struct semaphore robust_sem;	/* semaphore to protect the list */
> +#endif
>  };

why is there per-vma info needed?

Also, what testing did this patch have - should it solve Dinakar's 
problem(s)?

	Ingo