[PATCH] objtool: ignore INT3 padding

[Alexey Dobriyan]

NOP padding doesn't count as unreachable instruction
neither should INT3.

Signed-off-by: Alexey Dobriyan <adobri...@gmail.com>
---

 tools/objtool/arch.h            |    3 ++-
 tools/objtool/arch/x86/decode.c |    4 ++++
 tools/objtool/check.c           |    3 +++
 3 files changed, 9 insertions(+), 1 deletion(-)

--- a/tools/objtool/arch.h
+++ b/tools/objtool/arch.h
@@ -34,7 +34,8 @@
 #define INSN_BUG               9
 #define INSN_NOP               10
 #define INSN_OTHER             11
-#define INSN_LAST              INSN_OTHER
+#define INSN_INT3              12
+#define INSN_LAST              INSN_INT3
 
 enum op_dest_type {
        OP_DEST_REG,
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -440,6 +440,10 @@ int arch_decode_instruction(struct elf *elf, struct 
section *sec,
                *type = INSN_CONTEXT_SWITCH;
                break;
 
+       case 0xcc:
+               *type = INSN_INT3;
+               break;
+
        case 0xe8:
                *type = INSN_CALL;
                break;
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1998,6 +1998,9 @@ static bool ignore_unreachable_insn(struct instruction 
*insn)
 
        if (insn->ignore || insn->type == INSN_NOP)
                return true;
+       /* Inter-function padding. */
+       if (insn->type == INSN_INT3)
+               return true;
 
        /*
         * Ignore any unused exceptions.  This can happen when a whitelisted