x86/ptrace: Mark expected switch fall-through

Mark switch cases where we are expecting to fall through.

Fix the following warning (Building: allnoconfig i386):

arch/x86/kernel/ptrace.c:202:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (unlikely(value == 0))
      ^
arch/x86/kernel/ptrace.c:206:2: note: here
  default:
  ^~~~~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20190805195654.GA17831@embeddedor

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 0fdbe89d0754058c6d61be12e42134b1a4359045..3c5bbe8e412087f15cf3280a43c921fe32f54e0a 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -201,6 +201,7 @@ static int set_segment_reg(struct task_struct *task,
        case offsetof(struct user_regs_struct, ss):
                if (unlikely(value == 0))
                        return -EIO;
+               /* Else, fall through */
 
        default:
                *pt_regs_access(task_pt_regs(task), offset) = value;