[PATCH] x86, kprobes: Hide skip_singlestep forward declaration properly

[Borislav Petkov <bp@amd64.org>]

From: Borislav Petkov <borislav.petkov@amd.com>

I get

arch/x86/kernel/kprobes.c:544:23: warning: ‘skip_singlestep’ declared ‘static’ but never defined [-Wunused-function]

on tip/auto-latest.

Hide the forward declaration in the KPROBES_CAN_USE_FTRACE as it
is done in its callsites.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
 arch/x86/kernel/kprobes.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index b7c2a85d1926..ac4188368fdf 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -541,8 +541,11 @@ reenter_kprobe(struct kprobe *p, struct pt_regs *regs, struct kprobe_ctlblk *kcb
 	return 1;
 }
 
+#ifdef KPROBES_CAN_USE_FTRACE
 static void __kprobes skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 				      struct kprobe_ctlblk *kcb);
+#endif
+
 /*
  * Interrupts are disabled on entry as trap3 is an interrupt gate and they
  * remain disabled throughout this function.
-- 
1.7.11.rc1