v is unsigned, cast to signed to evaluate the do_brk() return value,
    
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
---
diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index 290d8e3..fad2a2a 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -583,15 +583,15 @@ static void irix_map_prda_page(void)
 	unsigned long v;
 	struct prda *pp;
 
 	down_write(&current->mm->mmap_sem);
 	v =  do_brk(PRDA_ADDRESS, PAGE_SIZE);
 	up_write(&current->mm->mmap_sem);
 
-	if (v < 0)
+	if ((long) v < 0)
 		return;
 
 	pp = (struct prda *) v;
 	pp->prda_sys.t_pid  = task_pid_vnr(current);
 	pp->prda_sys.t_prid = read_c0_prid();
 	pp->prda_sys.t_rpid = task_pid_vnr(current);
 

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