powerpc/kprobes: Warn if instruction patching failed

When arming and disarming probes, we currently assume that instruction
patching can never fail, and don't have a mechanism to surface errors.
Add a warning in case instruction patching ever fails.

Signed-off-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/18d7b1309f938c08ce07738100932b551bdd3a52.1621416666.git.naveen.n.rao@linux.vnet.ibm.com

arch/powerpc/kernel/kprobes.c

@@ -165,13 +165,13 @@ NOKPROBE_SYMBOL(arch_prepare_kprobe);
 
 void arch_arm_kprobe(struct kprobe *p)
 {
-	patch_instruction(p->addr, ppc_inst(BREAKPOINT_INSTRUCTION));
+	WARN_ON_ONCE(patch_instruction(p->addr, ppc_inst(BREAKPOINT_INSTRUCTION)));
 }
 NOKPROBE_SYMBOL(arch_arm_kprobe);
 
 void arch_disarm_kprobe(struct kprobe *p)
 {
-	patch_instruction(p->addr, ppc_inst(p->opcode));
+	WARN_ON_ONCE(patch_instruction(p->addr, ppc_inst(p->opcode)));
 }
 NOKPROBE_SYMBOL(arch_disarm_kprobe);