RE: highmem deadlock fix [was Re: VM in 2.4.10(+tweaks) vs. 2.4.9

> -----Original Message-----
> From: Andrea Arcangeli [mailto:[e-mail]]
> Sent: Thursday, September 27, 2001 5:13 PM
> To: Macaulay, Robert
> Cc: Rik van Riel; Craig Kulesa; [e-mail]; Bob
> Matthews; Marcelo Tosatti; Linus Torvalds
> Subject: highmem deadlock fix [was Re: VM in 2.4.10(+tweaks) vs.
> 2.4.9-ac14/15(+stuff)]
> 
> @@ -2519,7 +2521,9 @@
>  	int tryagain = 1;
>  
>  	do {
> -		if (buffer_dirty(p) || buffer_locked(p)) {
> +		if (unlikely(buffer_pending_IO(p)))
> +			tryagain = 0;
> +		else if (buffer_dirty(p) || buffer_locked(p)) {
>  			if (test_and_set_bit(BH_Wait_IO, &p->b_state)) {
>  				if (buffer_dirty(p)) {
>  					ll_rw_block(WRITE, 1, &p);
> 

Im getting an undefined reference to the unlikely function in this patch.