Re: [Xen-devel] [PATCH v1 3/7] mm: Use statically defined locking order

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Fri, 2016-05-06 at 16:48 +0100, Ross Lagerwall wrote:
> Instead of using a locking order based on line numbers which doesn't
> play nicely with xSplice, statically define the locking order.
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
>
Reviewed-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>

FWIW, I actually like this...

> --- a/xen/arch/x86/mm/mm-locks.h
> +++ b/xen/arch/x86/mm/mm-locks.h
> @@ -46,8 +46,10 @@ static inline int mm_locked_by_me(mm_lock_t *l)
>      return (l->lock.recurse_cpu == current->processor);
>  }
>  
> -/* If you see this crash, the numbers printed are lines in this
> file 
> - * where the offending locks are declared. */
> +/*
> + * If you see this crash, the numbers printed are order levels
> defined
> + * in this file.
> + */
>
... and, apart from the fat that it server xsplice purposes, I'd say
this is an improvement on its own of the current situation (although I
understand this is a matter of taste). :-)

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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