[RFC PATCH 1/3] early kprobes: ARM: add definition for vmlinux.lds use.

[Wang Nan]

This patch defines MAX_OPTINSN_SIZE, MAX_INSN_SIZE and
KPROBE_OPCODE_SIZE for ARM for vmlinux.lds.S use. These macros are
originally defined in kprobes.h, which are unable to be used in
vmlinux.lds.

Signed-off-by: Wang Nan <wangnan0 at huawei.com>
---
 arch/arm/kernel/vmlinux.lds.S | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index b31aa73..38ba4fd 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -45,6 +45,16 @@
 #define ARM_EXIT_DISCARD(x)	x
 #endif
 
+#ifdef CONFIG_EARLY_KPROBES
+# ifdef CONFIG_THUMB2_KERNEL
+#  error "Thumb2 kernel does not support early kprobes now"
+# else
+#  define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry)
+#  define MAX_INSN_SIZE 2
+#  define KPROBE_OPCODE_SIZE 4
+# endif
+#endif
+
 OUTPUT_ARCH(arm)
 ENTRY(stext)
 
-- 
1.8.4