[PATCH v4 1/3] arch: add the macro COMPILE_OFFSETS to all the asm-offsets.c

[Menglong Dong <menglong.dong@linux.dev>]

The include/generated/asm-offsets.h is generated in Kbuild during
compiling from arch/SRCARCH/kernel/asm-offsets.c. When we want to
generate another similar offset header file, circular dependency can
happen.

For example, we want to generate a offset file include/generated/test.h,
which is included in include/sched/sched.h. If we generate asm-offsets.h
first, it will fail, as include/sched/sched.h is included in asm-offsets.c
and include/generated/test.h doesn't exist; If we generate test.h first,
it can't success neither, as include/generated/asm-offsets.h is included
by it.

In x86_64, the macro COMPILE_OFFSETS is used to avoid such circular
dependency. We can generate asm-offsets.h first, and if the
COMPILE_OFFSETS is defined, we don't include the "generated/test.h".

And we define the macro COMPILE_OFFSETS for all the asm-offsets.c for this
purpose.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
---
 arch/alpha/kernel/asm-offsets.c      | 1 +
 arch/arc/kernel/asm-offsets.c        | 1 +
 arch/arm/kernel/asm-offsets.c        | 2 ++
 arch/arm64/kernel/asm-offsets.c      | 1 +
 arch/csky/kernel/asm-offsets.c       | 1 +
 arch/hexagon/kernel/asm-offsets.c    | 1 +
 arch/loongarch/kernel/asm-offsets.c  | 2 ++
 arch/m68k/kernel/asm-offsets.c       | 1 +
 arch/microblaze/kernel/asm-offsets.c | 1 +
 arch/mips/kernel/asm-offsets.c       | 2 ++
 arch/nios2/kernel/asm-offsets.c      | 1 +
 arch/openrisc/kernel/asm-offsets.c   | 1 +
 arch/parisc/kernel/asm-offsets.c     | 1 +
 arch/powerpc/kernel/asm-offsets.c    | 1 +
 arch/riscv/kernel/asm-offsets.c      | 1 +
 arch/s390/kernel/asm-offsets.c       | 1 +
 arch/sh/kernel/asm-offsets.c         | 1 +
 arch/sparc/kernel/asm-offsets.c      | 1 +
 arch/um/kernel/asm-offsets.c         | 2 ++
 arch/xtensa/kernel/asm-offsets.c     | 1 +
 20 files changed, 24 insertions(+)

diff --git a/arch/alpha/kernel/asm-offsets.c b/arch/alpha/kernel/asm-offsets.c
index e9dad60b147f..1ebb05890499 100644
--- a/arch/alpha/kernel/asm-offsets.c
+++ b/arch/alpha/kernel/asm-offsets.c
@@ -4,6 +4,7 @@
  * This code generates raw asm output which is post-processed to extract
  * and format the required data.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/types.h>
 #include <linux/stddef.h>
diff --git a/arch/arc/kernel/asm-offsets.c b/arch/arc/kernel/asm-offsets.c
index f77deb799175..2978da85fcb6 100644
--- a/arch/arc/kernel/asm-offsets.c
+++ b/arch/arc/kernel/asm-offsets.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  */
+#define COMPILE_OFFSETS
 
 #include <linux/sched.h>
 #include <linux/mm.h>
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 123f4a8ef446..2101938d27fc 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -7,6 +7,8 @@
  * This code generates raw asm output which is post-processed to extract
  * and format the required data.
  */
+#define COMPILE_OFFSETS
+
 #include <linux/compiler.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 30d4bbe68661..b6367ff3a49c 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -6,6 +6,7 @@
  *               2001-2002 Keith Owens
  * Copyright (C) 2012 ARM Ltd.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/arm_sdei.h>
 #include <linux/sched.h>
diff --git a/arch/csky/kernel/asm-offsets.c b/arch/csky/kernel/asm-offsets.c
index d1e903579473..5525c8e7e1d9 100644
--- a/arch/csky/kernel/asm-offsets.c
+++ b/arch/csky/kernel/asm-offsets.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+#define COMPILE_OFFSETS
 
 #include <linux/sched.h>
 #include <linux/kernel_stat.h>
diff --git a/arch/hexagon/kernel/asm-offsets.c b/arch/hexagon/kernel/asm-offsets.c
index 03a7063f9456..50eea9fa6f13 100644
--- a/arch/hexagon/kernel/asm-offsets.c
+++ b/arch/hexagon/kernel/asm-offsets.c
@@ -8,6 +8,7 @@
  *
  * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/compat.h>
 #include <linux/types.h>
diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
index db1e4bb26b6a..3017c7157600 100644
--- a/arch/loongarch/kernel/asm-offsets.c
+++ b/arch/loongarch/kernel/asm-offsets.c
@@ -4,6 +4,8 @@
  *
  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  */
+#define COMPILE_OFFSETS
+
 #include <linux/types.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
diff --git a/arch/m68k/kernel/asm-offsets.c b/arch/m68k/kernel/asm-offsets.c
index 906d73230537..67a1990f9d74 100644
--- a/arch/m68k/kernel/asm-offsets.c
+++ b/arch/m68k/kernel/asm-offsets.c
@@ -9,6 +9,7 @@
  * #defines from the assembly-language output.
  */
 
+#define COMPILE_OFFSETS
 #define ASM_OFFSETS_C
 
 #include <linux/stddef.h>
diff --git a/arch/microblaze/kernel/asm-offsets.c b/arch/microblaze/kernel/asm-offsets.c
index 104c3ac5f30c..b4b67d58e7f6 100644
--- a/arch/microblaze/kernel/asm-offsets.c
+++ b/arch/microblaze/kernel/asm-offsets.c
@@ -7,6 +7,7 @@
  * License. See the file "COPYING" in the main directory of this archive
  * for more details.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/init.h>
 #include <linux/stddef.h>
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 1e29efcba46e..5debd9a3854a 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -9,6 +9,8 @@
  * Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
  * Copyright (C) 2000 MIPS Technologies, Inc.
  */
+#define COMPILE_OFFSETS
+
 #include <linux/compat.h>
 #include <linux/types.h>
 #include <linux/sched.h>
diff --git a/arch/nios2/kernel/asm-offsets.c b/arch/nios2/kernel/asm-offsets.c
index e3d9b7b6fb48..88190b503ce5 100644
--- a/arch/nios2/kernel/asm-offsets.c
+++ b/arch/nios2/kernel/asm-offsets.c
@@ -2,6 +2,7 @@
 /*
  * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
  */
+#define COMPILE_OFFSETS
 
 #include <linux/stddef.h>
 #include <linux/sched.h>
diff --git a/arch/openrisc/kernel/asm-offsets.c b/arch/openrisc/kernel/asm-offsets.c
index 710651d5aaae..3cc826f2216b 100644
--- a/arch/openrisc/kernel/asm-offsets.c
+++ b/arch/openrisc/kernel/asm-offsets.c
@@ -18,6 +18,7 @@
  * compile this file to assembler, and then extract the
  * #defines from the assembly-language output.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/signal.h>
 #include <linux/sched.h>
diff --git a/arch/parisc/kernel/asm-offsets.c b/arch/parisc/kernel/asm-offsets.c
index 757816a7bd4b..9abfe65492c6 100644
--- a/arch/parisc/kernel/asm-offsets.c
+++ b/arch/parisc/kernel/asm-offsets.c
@@ -13,6 +13,7 @@
  *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
  *    Copyright (C) 2003 James Bottomley <jejb at parisc-linux.org>
  */
+#define COMPILE_OFFSETS
 
 #include <linux/types.h>
 #include <linux/sched.h>
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index b3048f6d3822..a4bc80b30410 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -8,6 +8,7 @@
  * compile this file to assembler, and then extract the
  * #defines from the assembly-language output.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/compat.h>
 #include <linux/signal.h>
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index 6e8c0d6feae9..7d42d3b8a32a 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2012 Regents of the University of California
  * Copyright (C) 2017 SiFive
  */
+#define COMPILE_OFFSETS
 
 #include <linux/kbuild.h>
 #include <linux/mm.h>
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 95ecad9c7d7d..a8915663e917 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -4,6 +4,7 @@
  * This code generates raw asm output which is post-processed to extract
  * and format the required data.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/kbuild.h>
 #include <linux/sched.h>
diff --git a/arch/sh/kernel/asm-offsets.c b/arch/sh/kernel/asm-offsets.c
index a0322e832845..429b6a763146 100644
--- a/arch/sh/kernel/asm-offsets.c
+++ b/arch/sh/kernel/asm-offsets.c
@@ -8,6 +8,7 @@
  * compile this file to assembler, and then extract the
  * #defines from the assembly-language output.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/stddef.h>
 #include <linux/types.h>
diff --git a/arch/sparc/kernel/asm-offsets.c b/arch/sparc/kernel/asm-offsets.c
index 3d9b9855dce9..6e660bde48dd 100644
--- a/arch/sparc/kernel/asm-offsets.c
+++ b/arch/sparc/kernel/asm-offsets.c
@@ -10,6 +10,7 @@
  *
  * On sparc, thread_info data is static and TI_XXX offsets are computed by hand.
  */
+#define COMPILE_OFFSETS
 
 #include <linux/sched.h>
 #include <linux/mm_types.h>
diff --git a/arch/um/kernel/asm-offsets.c b/arch/um/kernel/asm-offsets.c
index 1fb12235ab9c..a69873aa697f 100644
--- a/arch/um/kernel/asm-offsets.c
+++ b/arch/um/kernel/asm-offsets.c
@@ -1 +1,3 @@
+#define COMPILE_OFFSETS
+
 #include <sysdep/kernel-offsets.h>
diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c
index da38de20ae59..cfbced95e944 100644
--- a/arch/xtensa/kernel/asm-offsets.c
+++ b/arch/xtensa/kernel/asm-offsets.c
@@ -11,6 +11,7 @@
  *
  * Chris Zankel <chris@zankel.net>
  */
+#define COMPILE_OFFSETS
 
 #include <asm/processor.h>
 #include <asm/coprocessor.h>
-- 
2.51.0