powerpc/mm: Blacklist SLB symbols from kprobe

We can't sensibly take a trap at this point. So, blacklist these
symbols.

Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/slb_low.S

@@ -272,3 +272,11 @@ slb_compare_rr_to_size:
 	clrrdi	r3,r3,SID_SHIFT_1T	/* clear out non-ESID bits */
 	b	7b
 
+
+_ASM_NOKPROBE_SYMBOL(slb_allocate_realmode)
+_ASM_NOKPROBE_SYMBOL(slb_miss_kernel_load_linear)
+_ASM_NOKPROBE_SYMBOL(slb_miss_kernel_load_io)
+_ASM_NOKPROBE_SYMBOL(slb_compare_rr_to_size)
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+_ASM_NOKPROBE_SYMBOL(slb_miss_kernel_load_vmemmap)
+#endif