X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=kernel%2Fexit.c;h=3594291a854286545de8c33048bb57396871b083;hb=dea8dcf2a9fa8cc540136a6cd885c3beece16ec3;hp=1f236ed375f83c2bf6b3c88c65d94d6ac9b2c0b3;hpb=5b2fc08c455bbf749489254a81baeffdf4c0a693;p=linux-2.6-microblaze.git

diff --git a/kernel/exit.c b/kernel/exit.c
index 1f236ed375f8..3594291a8542 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -478,10 +478,24 @@ static void exit_mm(void)
 	BUG_ON(mm != current->active_mm);
 	/* more a memory barrier than a real lock */
 	task_lock(current);
+	/*
+	 * When a thread stops operating on an address space, the loop
+	 * in membarrier_private_expedited() may not observe that
+	 * tsk->mm, and the loop in membarrier_global_expedited() may
+	 * not observe a MEMBARRIER_STATE_GLOBAL_EXPEDITED
+	 * rq->membarrier_state, so those would not issue an IPI.
+	 * Membarrier requires a memory barrier after accessing
+	 * user-space memory, before clearing tsk->mm or the
+	 * rq->membarrier_state.
+	 */
+	smp_mb__after_spinlock();
+	local_irq_disable();
 	current->mm = NULL;
-	mmap_read_unlock(mm);
+	membarrier_update_current_mm(NULL);
 	enter_lazy_tlb(mm, current);
+	local_irq_enable();
 	task_unlock(current);
+	mmap_read_unlock(mm);
 	mm_update_next_owner(mm);
 	mmput(mm);
 	if (test_thread_flag(TIF_MEMDIE))