linux-kernel - [PATCH v4 4/4] objtool: check: Use orc definition only when needed

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Date:   Tue, 25 Aug 2020 13:47:42 +0100
From:   Julien Thierry <jthierry@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org, mbenes@...e.cz,
        benh@...nel.crashing.org, Julien Thierry <jthierry@...hat.com>
Subject: [PATCH v4 4/4] objtool: check: Use orc definition only when needed

Implementation of ORC requires some definitions that are currently
provided by the target architecture headers. Do not depend on these
definitions when the orc subcommand is not implemented.

This avoid requiring arches with no orc implementation to provide dummy
orc definitions.

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 tools/objtool/Makefile | 4 ++++
 tools/objtool/arch.h   | 2 ++
 tools/objtool/check.h  | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 7770edcda3a0..33d1e3ca8efd 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -55,6 +55,10 @@ ifeq ($(SRCARCH),x86)
 	SUBCMD_ORC := y
 endif
 
+ifeq ($(SUBCMD_ORC),y)
+	CFLAGS += -DINSN_USE_ORC
+endif
+
 export SUBCMD_CHECK SUBCMD_ORC
 export srctree OUTPUT CFLAGS SRCARCH AWK
 include $(srctree)/tools/build/Makefile.include
diff --git a/tools/objtool/arch.h b/tools/objtool/arch.h
index 2e2ce089b0e9..b18c5f61d42d 100644
--- a/tools/objtool/arch.h
+++ b/tools/objtool/arch.h
@@ -11,7 +11,9 @@
 #include "objtool.h"
 #include "cfi.h"
 
+#ifdef INSN_USE_ORC
 #include <asm/orc_types.h>
+#endif
 
 enum insn_type {
 	INSN_JUMP_CONDITIONAL,
diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index 061aa96e15d3..0abdf8efdbc0 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -42,7 +42,9 @@ struct instruction {
 	struct symbol *func;
 	struct list_head stack_ops;
 	struct cfi_state cfi;
+#ifdef INSN_USE_ORC
 	struct orc_entry orc;
+#endif
 };
 
 struct instruction *find_insn(struct objtool_file *file,
-- 
2.21.3