linux-kernel - [PATCH v1 1/3] ACPI / x86: boot: Not all platforms require acpi_reduced_hw

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Message-Id: <20180117173409.88136-1-andriy.shevchenko@linux.intel.com>
Date:   Wed, 17 Jan 2018 19:34:07 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/3] ACPI / x86: boot: Not all platforms require acpi_reduced_hw_init()

Some platforms might take care of legacy devices on theirs own.
Let's allow them to do that by exporting a weak function.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 arch/x86/kernel/acpi/boot.c | 2 +-
 include/linux/acpi.h        | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index ec3a286163c3..9a714b79ebed 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1375,7 +1375,7 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d)
  *
  * We initialize the Hardware-reduced ACPI model here:
  */
-static void __init acpi_reduced_hw_init(void)
+void __init __weak acpi_reduced_hw_init(void)
 {
 	if (acpi_gbl_reduced_hardware) {
 		/*
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index f0ea50ba0550..eb881516bce6 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -226,6 +226,8 @@ struct acpi_subtable_proc {
 
 void __iomem *__acpi_map_table(unsigned long phys, unsigned long size);
 void __acpi_unmap_table(void __iomem *map, unsigned long size);
+
+void acpi_reduced_hw_init(void);
 int early_acpi_boot_init(void);
 int acpi_boot_init (void);
 void acpi_boot_table_init (void);
@@ -707,6 +709,7 @@ static inline struct device *acpi_get_first_physical_node(struct acpi_device *ad
 static inline void acpi_early_init(void) { }
 static inline void acpi_subsystem_init(void) { }
 
+static inline void acpi_reduced_hw_init(void) { }
 static inline int early_acpi_boot_init(void)
 {
 	return 0;
-- 
2.15.1