powerpc/32s: Blacklist functions running with MMU disabled for kprobe

kprobe does not handle events happening in real mode, all
functions running with MMU disabled have to be blacklisted.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/dabed523c1b8955dd425152ce260b390053e727a.1585670437.git.christophe.leroy@c-s.fr

arch/powerpc/mm/book3s32/hash_low.S

@@ -163,6 +163,7 @@ _GLOBAL(hash_page)
 	stw	r0, (mmu_hash_lock - PAGE_OFFSET)@l(r8)
 	blr
 #endif /* CONFIG_SMP */
+_ASM_NOKPROBE_SYMBOL(hash_page)
 
 /*
  * Add an entry for a particular page to the hash table.
@@ -267,6 +268,7 @@ _GLOBAL(add_hash_page)
 	lwz	r0,4(r1)
 	mtlr	r0
 	blr
+_ASM_NOKPROBE_SYMBOL(add_hash_page)
 
 /*
  * This routine adds a hardware PTE to the hash table.
@@ -474,6 +476,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
 
 	sync		/* make sure pte updates get to memory */
 	blr
+_ASM_NOKPROBE_SYMBOL(create_hpte)
 
 	.section .bss
 	.align	2
@@ -630,6 +633,7 @@ _GLOBAL(flush_hash_pages)
 	isync
 	blr
 EXPORT_SYMBOL(flush_hash_pages)
+_ASM_NOKPROBE_SYMBOL(flush_hash_pages)
 
 /*
  * Flush an entry from the TLB
@@ -667,6 +671,7 @@ _GLOBAL(_tlbie)
 	sync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbie)
 
 /*
  * Flush the entire TLB. 603/603e only
@@ -708,3 +713,4 @@ _GLOBAL(_tlbia)
 	isync
 #endif /* CONFIG_SMP */
 	blr
+_ASM_NOKPROBE_SYMBOL(_tlbia)