Re: RT and XFS

[William Weston]

On Tue, 12 Jul 2005, Daniel Walker wrote:

> Is there something so odd about the XFS locking, that it can't use the
> rt_lock ?
> 
> 
> --- linux.orig/fs/xfs/linux-2.6/mrlock.h
> +++ linux/fs/xfs/linux-2.6/mrlock.h
> @@ -37,12 +37,12 @@
>  enum { MR_NONE, MR_ACCESS, MR_UPDATE };
>  
>  typedef struct {
> -	struct rw_semaphore	mr_lock;
> -	int			mr_writer;
> +	struct compat_rw_semaphore	mr_lock;
> +	int				mr_writer;
>  } mrlock_t;

BTW, what's the difference between rw_semaphore and compat_rw_semaphore?  
Or between semaphore and compat_semaphore?  I ran into a similar issue
(needing compat_semaphore) with the IVTV drivers.  The following is a
portion of my patch to get IVTV running under RT (the other portions are
just compile-time semantics):

--- ivtv-0.2.0-rc3k.orig/driver/msp3400.c       2004-11-19 08:21:04.000000000 -0800
+++ ivtv-0.2.0-rc3k/driver/msp3400.c    2005-06-22 17:26:24.000000000 
-0700
@@ -115,7 +115,7 @@
 	struct task_struct  *thread;
 	wait_queue_head_t    wq;
 
-	struct semaphore    *notify;
+	struct compat_semaphore *notify;
 	int                  active,restart,rmmod;
 
 	int                  watch_stereo;

--ww
-
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