linux-kernel - [PATCH] acpi: Fix ARM32 platforms compile issue introduced by fw

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Date:   Tue, 21 Nov 2023 08:58:12 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     linus.walleij@...aro.org, rafael@...nel.org
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, lenb@...nel.org,
        robert.moore@...el.com, Jonathan.Cameron@...wei.com,
        dan.j.williams@...el.com, guohanjun@...wei.com, arnd@...db.de,
        linux-acpi@...r.kernel.org, acpica-devel@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] acpi: Fix ARM32 platforms compile issue introduced by
 fw_table changes

Linus reported that:
After commit a103f46633fd the kernel stopped compiling for
several ARM32 platforms that I am building with a bare metal
compiler. Bare metal compilers (arm-none-eabi-) don't
define __linux__.

This is because the header <acpi/platform/acenv.h> is now
in the include path for <linux/irq.h>:

  CC      arch/arm/kernel/irq.o
  CC      kernel/sysctl.o
  CC      crypto/api.o
In file included from ../include/acpi/acpi.h:22,
                 from ../include/linux/fw_table.h:29,
                 from ../include/linux/acpi.h:18,
                 from ../include/linux/irqchip.h:14,
                 from ../arch/arm/kernel/irq.c:25:
../include/acpi/platform/acenv.h:218:2: error: #error Unknown target environment
  218 | #error Unknown target environment
      |  ^~~~~

The issue is caused by the introducing of splitting out the ACPI code to
support the new generic fw_table code.

Rafael suggested moving the fw_table.h include in linux/acpi.h to below
the asm/acpi.h. The move also helped with eliminating the inclusion of
acpi/acpi.h in fw_table.h. The unfortunate circular inclusion of
linux/acpi.h is needed for fw_table.h due fw_table code needing the
defined acpi structs in order to build.

Fixes: a103f46633fd ("acpi: Move common tables helper functions to common lib")
Reported-by: Linus Walleij <linus.walleij@...aro.org>
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
 include/linux/acpi.h     |   23 ++++++++++++-----------
 include/linux/fw_table.h |    1 -
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 54189e0e5f41..2789beb26138 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -15,7 +15,6 @@
 #include <linux/mod_devicetable.h>
 #include <linux/property.h>
 #include <linux/uuid.h>
-#include <linux/fw_table.h>
 
 struct irq_domain;
 struct irq_domain_ops;
@@ -25,16 +24,6 @@ struct irq_domain_ops;
 #endif
 #include <acpi/acpi.h>
 
-#ifdef CONFIG_ACPI_TABLE_LIB
-#define EXPORT_SYMBOL_ACPI_LIB(x) EXPORT_SYMBOL_NS_GPL(x, ACPI)
-#define __init_or_acpilib
-#define __initdata_or_acpilib
-#else
-#define EXPORT_SYMBOL_ACPI_LIB(x)
-#define __init_or_acpilib __init
-#define __initdata_or_acpilib __initdata
-#endif
-
 #ifdef	CONFIG_ACPI
 
 #include <linux/list.h>
@@ -48,6 +37,18 @@ struct irq_domain_ops;
 #include <acpi/acpi_io.h>
 #include <asm/acpi.h>
 
+#include <linux/fw_table.h>
+
+#ifdef CONFIG_ACPI_TABLE_LIB
+#define EXPORT_SYMBOL_ACPI_LIB(x) EXPORT_SYMBOL_NS_GPL(x, ACPI)
+#define __init_or_acpilib
+#define __initdata_or_acpilib
+#else
+#define EXPORT_SYMBOL_ACPI_LIB(x)
+#define __init_or_acpilib __init
+#define __initdata_or_acpilib __initdata
+#endif
+
 static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
 {
 	return adev ? adev->handle : NULL;
diff --git a/include/linux/fw_table.h b/include/linux/fw_table.h
index ff8fa58d5818..a722300c215b 100644
--- a/include/linux/fw_table.h
+++ b/include/linux/fw_table.h
@@ -26,7 +26,6 @@ struct acpi_subtable_proc {
 };
 
 #include <linux/acpi.h>
-#include <acpi/acpi.h>
 
 union acpi_subtable_headers {
 	struct acpi_subtable_header common;