diff -Nur --exclude=SCCS --exclude=BitKeeper --exclude=ChangeSet bk-official-extra/arch/ia64/kernel/perfmon.c bk-base/arch/ia64/kernel/perfmon.c
--- bk-official-extra/arch/ia64/kernel/perfmon.c	Thu Apr 10 14:01:35 2003
+++ bk-base/arch/ia64/kernel/perfmon.c	Thu Apr 10 12:24:05 2003
@@ -1883,7 +1883,10 @@
 		DBprintk(("unblocking %d \n", task->pid));
 		up(sem);
 	} else {
+		struct thread_info *info = (struct thread_info *) ((char *) task + IA64_TASK_SIZE);
 		task->thread.pfm_ovfl_block_reset = 1;
+		ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_RESET;
+		set_bit(TIF_NOTIFY_RESUME, &info->flags);
 	}
 #if 0
 	/*
@@ -2733,6 +2736,7 @@
 	 * again
 	 */
 	th->pfm_ovfl_block_reset = 0;
+	clear_thread_flag(TIF_NOTIFY_RESUME);
 
 	/*
 	 * do some sanity checks first
@@ -2907,8 +2911,9 @@
 static unsigned long
 pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, struct pt_regs *regs)
 {
-	unsigned long mask;
 	struct thread_struct *t;
+	struct thread_info *info;
+	unsigned long mask;
 	unsigned long old_val;
 	unsigned long ovfl_notify = 0UL, ovfl_pmds = 0UL;
 	int i;
@@ -3053,6 +3058,8 @@
 		t->pfm_ovfl_block_reset = 1; /* will cause blocking */
 		ctx->ctx_fl_trap_reason = PFM_TRAP_REASON_SIG;
 	}
+	info = (struct thread_info *) ((char *) task + IA64_TASK_SIZE);
+	set_bit(TIF_NOTIFY_RESUME, &info->flags);
 
 	/*
 	 * keep the PMU frozen until either pfm_restart() or