[PATCH 004/119] xfs: enable buffer deadlock postmortem diagnosis via ftrace

[Christoph Hellwig]

> diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> index efa2a73..2333db7 100644
> --- a/fs/xfs/xfs_buf.c
> +++ b/fs/xfs/xfs_buf.c
> @@ -947,7 +947,8 @@ xfs_buf_trylock(
>  	if (locked)
>  		XB_SET_OWNER(bp);
>  
> -	trace_xfs_buf_trylock(bp, _RET_IP_);
> +	locked ? trace_xfs_buf_trylock(bp, _RET_IP_) :
> +		 trace_xfs_buf_trylock_fail(bp, _RET_IP_);
>  	return locked;

I think this should be something like:

	if (locked) {
		XB_SET_OWNER(bp);
		trace_xfs_buf_trylock(bp, _RET_IP_);
	} else {
		trace_xfs_buf_trylock_fail(bp, _RET_IP_);
	}

otherwise this looks good and can go in without the rest of the series.