arm64: hw_breakpoint: Fix warnings about implicit fallthrough

Now that -Wimplicit-fallthrough is passed to GCC by default, the kernel
build has suddenly got noisy. Annotate the two fall-through cases in our
hw_breakpoint implementation, since they are both intentional.

Reported-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index 67b3bae..38ee151 100644 (file)
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -540,10 +540,14 @@ int hw_breakpoint_arch_parse(struct perf_event *bp,
                        /* Allow halfword watchpoints and breakpoints. */
                        if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2)
                                break;
+
+                       /* Fallthrough */
                case 3:
                        /* Allow single byte watchpoint. */
                        if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1)
                                break;
+
+                       /* Fallthrough */
                default:
                        return -EINVAL;
                }