[PATCH 5/5] powerpc/kprobes: Warn if instruction patching failed

[Naveen N. Rao]

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....@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/kprobes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 7195162362941f..e0190e75a221eb 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -158,13 +158,13 @@ NOKPROBE_SYMBOL(arch_prepare_kprobe);
 
 void arch_arm_kprobe(struct kprobe *p)
 {
-       patch_instruction((struct ppc_inst *)p->addr, 
ppc_inst(BREAKPOINT_INSTRUCTION));
+       WARN_ON_ONCE(patch_instruction((struct ppc_inst *)p->addr, 
ppc_inst(BREAKPOINT_INSTRUCTION)));
 }
 NOKPROBE_SYMBOL(arch_arm_kprobe);
 
 void arch_disarm_kprobe(struct kprobe *p)
 {
-       patch_instruction((struct ppc_inst *)p->addr, ppc_inst(p->opcode));
+       WARN_ON_ONCE(patch_instruction((struct ppc_inst *)p->addr, 
ppc_inst(p->opcode)));
 }
 NOKPROBE_SYMBOL(arch_disarm_kprobe);
 
-- 
2.30.2