Message-ID: <patch.git-cac1912eff37.your-ad-here.call-01601816519-ext-4857@work.hours>
Date:   Sun, 4 Oct 2020 15:05:42 +0200
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Miroslav Benes <mbenes@...e.cz>, Ingo Molnar <mingo@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Julien Thierry <jthierry@...hat.com>,
        Matt Helsley <mhelsley@...are.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Raphael Gault <raphael.gault@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] objtool: avoid ../ headers includes and name clashes

Currently objtool headers are being included either by their base name
or included via ../ from a parent directory. In case of a base name usage:

 #include "warn.h"
 #include "arch_elf.h"

it does not make it apparent from which directory the file comes from.
To make it slightly better, and actually to avoid name clashes some arch
specific files have "arch_" suffix. And files from an arch folder have
to revert to including via ../ e.g:

 #include "../../elf.h"

With additional architectures support and the code base growth there is
a need for clearer headers naming scheme for multiple reasons:
1. to make it instantly obvious where these files come from (objtool
   itself / objtool arch|generic folders / some other external files),
2. to avoid name clashes of objtool arch specific headers, potential
   obtool arch generic headers and the system header files (there is
   /usr/include/elf.h already),
3. to avoid ../ includes and improve code readability.
4. to give a warm fuzzy feeling to developers who are mostly kernel
   developers and are accustomed to linux kernel headers arranging
   scheme.

Doesn't this make it instantly obvious where are these files come from?

 #include <objtool/warn.h>
 #include <arch/elf.h>

And doesn't it look nicer to avoid ugly ../ includes? Which also
guarantees this is elf.h from the objtool and not /usr/include/elf.h.

 #include <objtool/elf.h>

This patch defines and implements new objtool headers arranging
scheme. Which is:
- all generic headers go to include/objtool (similar to include/linux)
- all arch headers go to arch/$(SRCARCH)/include/arch (to get arch
  prefix). This is similar to linux arch specific "asm/*" headers but we
  are not abusing "asm" name and calling it what it is. This also helps
  to prevent name clashes (arch is not used in system headers or kernel
  exports).

To bring objtool to this state the following things are done:
1. current top level tools/objtool/ headers are moved into
   include/objtool/ subdirectory,
2. arch specific headers, currently only arch/x86/include/ are moved into
   arch/x86/include/arch/ and were stripped of "arch_" suffix,
3. new -I$(srctree)/tools/objtool/include include path to make
   includes like <objtool/warn.h> possible,
4. rewriting file includes,
5. make git not to ignore include/objtool/ subdirectory.

Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>
---
 tools/objtool/.gitignore                           |  2 +-
 tools/objtool/Makefile                             |  1 +
 tools/objtool/arch/x86/decode.c                    |  8 ++++----
 .../objtool/arch/x86/include/{ => arch}/cfi_regs.h |  0
 .../arch/x86/include/{arch_elf.h => arch/elf.h}    |  0
 .../x86/include/{arch_special.h => arch/special.h} |  0
 tools/objtool/arch/x86/special.c                   |  4 ++--
 tools/objtool/builtin-check.c                      |  4 ++--
 tools/objtool/builtin-orc.c                        |  4 ++--
 tools/objtool/check.c                              | 14 +++++++-------
 tools/objtool/elf.c                                |  6 +++---
 tools/objtool/{ => include/objtool}/arch.h         |  4 ++--
 tools/objtool/{ => include/objtool}/builtin.h      |  0
 tools/objtool/{ => include/objtool}/cfi.h          |  2 +-
 tools/objtool/{ => include/objtool}/check.h        |  4 ++--
 tools/objtool/{ => include/objtool}/elf.h          |  0
 tools/objtool/{ => include/objtool}/objtool.h      |  2 +-
 tools/objtool/{ => include/objtool}/special.h      |  4 ++--
 tools/objtool/{ => include/objtool}/warn.h         |  2 +-
 tools/objtool/objtool.c                            |  6 +++---
 tools/objtool/orc_dump.c                           |  4 ++--
 tools/objtool/orc_gen.c                            |  4 ++--
 tools/objtool/special.c                            |  8 ++++----
 tools/objtool/weak.c                               |  2 +-
 24 files changed, 43 insertions(+), 42 deletions(-)
 rename tools/objtool/arch/x86/include/{ => arch}/cfi_regs.h (100%)
 rename tools/objtool/arch/x86/include/{arch_elf.h => arch/elf.h} (100%)
 rename tools/objtool/arch/x86/include/{arch_special.h => arch/special.h} (100%)
 rename tools/objtool/{ => include/objtool}/arch.h (96%)
 rename tools/objtool/{ => include/objtool}/builtin.h (100%)
 rename tools/objtool/{ => include/objtool}/cfi.h (96%)
 rename tools/objtool/{ => include/objtool}/check.h (96%)
 rename tools/objtool/{ => include/objtool}/elf.h (100%)
 rename tools/objtool/{ => include/objtool}/objtool.h (96%)
 rename tools/objtool/{ => include/objtool}/special.h (94%)
 rename tools/objtool/{ => include/objtool}/warn.h (98%)

diff --git a/tools/objtool/.gitignore b/tools/objtool/.gitignore
index 45cefda24c7b..14236db3677f 100644
--- a/tools/objtool/.gitignore
+++ b/tools/objtool/.gitignore
@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 arch/x86/lib/inat-tables.c
-objtool
+/objtool
 fixdep
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 33d1e3ca8efd..0d944a29a357 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -36,6 +36,7 @@ all: $(OBJTOOL)
 INCLUDES := -I$(srctree)/tools/include \
 	    -I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
 	    -I$(srctree)/tools/arch/$(SRCARCH)/include	\
+	    -I$(srctree)/tools/objtool/include \
 	    -I$(srctree)/tools/objtool/arch/$(SRCARCH)/include
 WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
 CFLAGS   := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index cde9c36e40ae..6baa22732ca6 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -11,11 +11,11 @@
 #include "../../../arch/x86/lib/inat.c"
 #include "../../../arch/x86/lib/insn.c"
 
-#include "../../check.h"
-#include "../../elf.h"
-#include "../../arch.h"
-#include "../../warn.h"
 #include <asm/orc_types.h>
+#include <objtool/check.h>
+#include <objtool/elf.h>
+#include <objtool/arch.h>
+#include <objtool/warn.h>
 
 static unsigned char op_to_cfi_reg[][2] = {
 	{CFI_AX, CFI_R8},
diff --git a/tools/objtool/arch/x86/include/cfi_regs.h b/tools/objtool/arch/x86/include/arch/cfi_regs.h
similarity index 100%
rename from tools/objtool/arch/x86/include/cfi_regs.h
rename to tools/objtool/arch/x86/include/arch/cfi_regs.h
diff --git a/tools/objtool/arch/x86/include/arch_elf.h b/tools/objtool/arch/x86/include/arch/elf.h
similarity index 100%
rename from tools/objtool/arch/x86/include/arch_elf.h
rename to tools/objtool/arch/x86/include/arch/elf.h
diff --git a/tools/objtool/arch/x86/include/arch_special.h b/tools/objtool/arch/x86/include/arch/special.h
similarity index 100%
rename from tools/objtool/arch/x86/include/arch_special.h
rename to tools/objtool/arch/x86/include/arch/special.h
diff --git a/tools/objtool/arch/x86/special.c b/tools/objtool/arch/x86/special.c
index fd4af88c0ea5..b4bd3505fc94 100644
--- a/tools/objtool/arch/x86/special.c
+++ b/tools/objtool/arch/x86/special.c
@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 #include <string.h>
 
-#include "../../special.h"
-#include "../../builtin.h"
+#include <objtool/special.h>
+#include <objtool/builtin.h>
 
 #define X86_FEATURE_POPCNT (4 * 32 + 23)
 #define X86_FEATURE_SMAP   (9 * 32 + 20)
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index c6d199bfd0ae..f47951e19c9d 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -15,8 +15,8 @@
 
 #include <subcmd/parse-options.h>
 #include <string.h>
-#include "builtin.h"
-#include "objtool.h"
+#include <objtool/builtin.h>
+#include <objtool/objtool.h>
 
 bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux;
 
diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c
index 7b31121fa60b..6745f3328a0e 100644
--- a/tools/objtool/builtin-orc.c
+++ b/tools/objtool/builtin-orc.c
@@ -13,8 +13,8 @@
  */
 
 #include <string.h>
-#include "builtin.h"
-#include "objtool.h"
+#include <objtool/builtin.h>
+#include <objtool/objtool.h>
 
 static const char *orc_usage[] = {
 	"objtool orc generate [<options>] file.o",
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2df9f769412e..49c033253bfd 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -6,13 +6,13 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "builtin.h"
-#include "cfi.h"
-#include "arch.h"
-#include "check.h"
-#include "special.h"
-#include "warn.h"
-#include "arch_elf.h"
+#include <arch/elf.h>
+#include <objtool/builtin.h>
+#include <objtool/cfi.h>
+#include <objtool/arch.h>
+#include <objtool/check.h>
+#include <objtool/special.h>
+#include <objtool/warn.h>
 
 #include <linux/objtool.h>
 #include <linux/hashtable.h>
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 4e1d7460574b..427afa79fe7c 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -15,10 +15,10 @@
 #include <string.h>
 #include <unistd.h>
 #include <errno.h>
-#include "builtin.h"
+#include <objtool/builtin.h>
 
-#include "elf.h"
-#include "warn.h"
+#include <objtool/elf.h>
+#include <objtool/warn.h>
 
 #define MAX_NAME_LEN 128
 
diff --git a/tools/objtool/arch.h b/tools/objtool/include/objtool/arch.h
similarity index 96%
rename from tools/objtool/arch.h
rename to tools/objtool/include/objtool/arch.h
index 4a84c3081b8e..dc4f503a3ae4 100644
--- a/tools/objtool/arch.h
+++ b/tools/objtool/include/objtool/arch.h
@@ -8,8 +8,8 @@
 
 #include <stdbool.h>
 #include <linux/list.h>
-#include "objtool.h"
-#include "cfi.h"
+#include <objtool/objtool.h>
+#include <objtool/cfi.h>
 
 #ifdef INSN_USE_ORC
 #include <asm/orc_types.h>
diff --git a/tools/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
similarity index 100%
rename from tools/objtool/builtin.h
rename to tools/objtool/include/objtool/builtin.h
diff --git a/tools/objtool/cfi.h b/tools/objtool/include/objtool/cfi.h
similarity index 96%
rename from tools/objtool/cfi.h
rename to tools/objtool/include/objtool/cfi.h
index c7c59c6a44ee..fd5cb0bed9bf 100644
--- a/tools/objtool/cfi.h
+++ b/tools/objtool/include/objtool/cfi.h
@@ -6,7 +6,7 @@
 #ifndef _OBJTOOL_CFI_H
 #define _OBJTOOL_CFI_H
 
-#include "cfi_regs.h"
+#include <arch/cfi_regs.h>
 
 #define CFI_UNDEFINED		-1
 #define CFI_CFA			-2
diff --git a/tools/objtool/check.h b/tools/objtool/include/objtool/check.h
similarity index 96%
rename from tools/objtool/check.h
rename to tools/objtool/include/objtool/check.h
index 5ec00a4b891b..bba10968eac0 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/include/objtool/check.h
@@ -7,8 +7,8 @@
 #define _CHECK_H
 
 #include <stdbool.h>
-#include "cfi.h"
-#include "arch.h"
+#include <objtool/cfi.h>
+#include <objtool/arch.h>
 
 struct insn_state {
 	struct cfi_state cfi;
diff --git a/tools/objtool/elf.h b/tools/objtool/include/objtool/elf.h
similarity index 100%
rename from tools/objtool/elf.h
rename to tools/objtool/include/objtool/elf.h
diff --git a/tools/objtool/objtool.h b/tools/objtool/include/objtool/objtool.h
similarity index 96%
rename from tools/objtool/objtool.h
rename to tools/objtool/include/objtool/objtool.h
index 4125d4578b23..32f4cd1da9fa 100644
--- a/tools/objtool/objtool.h
+++ b/tools/objtool/include/objtool/objtool.h
@@ -10,7 +10,7 @@
 #include <linux/list.h>
 #include <linux/hashtable.h>
 
-#include "elf.h"
+#include <objtool/elf.h>
 
 #define __weak __attribute__((weak))
 
diff --git a/tools/objtool/special.h b/tools/objtool/include/objtool/special.h
similarity index 94%
rename from tools/objtool/special.h
rename to tools/objtool/include/objtool/special.h
index abddf38ef334..8a09f4e9d480 100644
--- a/tools/objtool/special.h
+++ b/tools/objtool/include/objtool/special.h
@@ -7,8 +7,8 @@
 #define _SPECIAL_H
 
 #include <stdbool.h>
-#include "check.h"
-#include "elf.h"
+#include <objtool/check.h>
+#include <objtool/elf.h>
 
 #define C_JUMP_TABLE_SECTION ".rodata..c_jump_table"
 
diff --git a/tools/objtool/warn.h b/tools/objtool/include/objtool/warn.h
similarity index 98%
rename from tools/objtool/warn.h
rename to tools/objtool/include/objtool/warn.h
index 7799f60de80a..d99c4675e4a5 100644
--- a/tools/objtool/warn.h
+++ b/tools/objtool/include/objtool/warn.h
@@ -11,7 +11,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include "elf.h"
+#include <objtool/elf.h>
 
 extern const char *objname;
 
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index 9df0cd86d310..e848feb0a5fc 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -21,9 +21,9 @@
 #include <subcmd/pager.h>
 #include <linux/kernel.h>
 
-#include "builtin.h"
-#include "objtool.h"
-#include "warn.h"
+#include <objtool/builtin.h>
+#include <objtool/objtool.h>
+#include <objtool/warn.h>
 
 struct cmd_struct {
 	const char *name;
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index 5e6a95368d35..f0b0fb334b79 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -6,8 +6,8 @@
 #include <unistd.h>
 #include <linux/objtool.h>
 #include <asm/orc_types.h>
-#include "objtool.h"
-#include "warn.h"
+#include <objtool/objtool.h>
+#include <objtool/warn.h>
 
 static const char *reg_name(unsigned int reg)
 {
diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 235663b96adc..72109b301835 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -9,8 +9,8 @@
 #include <linux/objtool.h>
 #include <asm/orc_types.h>
 
-#include "check.h"
-#include "warn.h"
+#include <objtool/check.h>
+#include <objtool/warn.h>
 
 int create_orc(struct objtool_file *file)
 {
diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index 1a2420febd08..dbe2bbb132cb 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -11,10 +11,10 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "builtin.h"
-#include "special.h"
-#include "warn.h"
-#include "arch_special.h"
+#include <arch/special.h>
+#include <objtool/builtin.h>
+#include <objtool/special.h>
+#include <objtool/warn.h>
 
 struct special_entry {
 	const char *sec;
diff --git a/tools/objtool/weak.c b/tools/objtool/weak.c
index 7843e9a7a72f..f2716827cc30 100644
--- a/tools/objtool/weak.c
+++ b/tools/objtool/weak.c
@@ -7,7 +7,7 @@
 
 #include <stdbool.h>
 #include <errno.h>
-#include "objtool.h"
+#include <objtool/objtool.h>
 
 #define UNSUPPORTED(name)						\
 ({									\
-- 
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