[POWERPC] Fix deadlock with mmu_hash_lock in hash_page_sync

hash_page_sync() takes and releases the low level mmu hash
lock in order to sync with other processors disposing of page
tables.  Because that lock can be needed to service hash misses
triggered by interrupt handlers, taking it must be done with
interrupts off.  However, hash_page_sync() appears to be called
with interrupts enabled, thus causing occasional deadlocks.

We fix it by making sure hash_page_sync() masks interrupts while
holding the lock.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_low_32.S

@@ -44,6 +44,9 @@ mmu_hash_lock:
 #ifdef CONFIG_SMP
 	.text
 _GLOBAL(hash_page_sync)
+	mfmsr   r10
+	rlwinm  r0,r10,0,17,15          /* clear bit 16 (MSR_EE) */
+	mtmsr   r0
 	lis	r8,mmu_hash_lock@h
 	ori	r8,r8,mmu_hash_lock@l
 	lis	r0,0x0fff
@@ -60,8 +63,9 @@ _GLOBAL(hash_page_sync)
 	eieio
 	li	r0,0
 	stw	r0,0(r8)
+	mtmsr	r10
 	blr
-#endif
+#endif /* CONFIG_SMP */
 
 /*
  * Load a PTE into the hash table, if possible.