linux-kernel - [tip: core/headers] ACPI/sleep: Convert acpi_wakeup

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Message-ID: <157943044502.396.15306490913678776890.tip-bot2@tip-bot2>
Date:   Sun, 19 Jan 2020 10:40:45 -0000
From:   "tip-bot2 for Sean Christopherson" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/headers] ACPI/sleep: Convert acpi_wakeup_address into a function

The following commit has been merged into the core/headers branch of tip:

Commit-ID:     8c53b318b222eff55d2900b554094a099b1a30f6
Gitweb:        https://git.kernel.org/tip/8c53b318b222eff55d2900b554094a099b1a30f6
Author:        Sean Christopherson <sean.j.christopherson@...el.com>
AuthorDate:    Tue, 26 Nov 2019 08:54:16 -08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 10 Dec 2019 10:15:48 +01:00

ACPI/sleep: Convert acpi_wakeup_address into a function

Convert acpi_wakeup_address from a raw variable into a function so that
x86 can wrap its dereference of the real mode boot header in a function
instead of broadcasting it to the world via a #define.  This sets the
stage for a future patch to move x86's definition of the new function,
acpi_get_wakeup_address(), out of asm/acpi.h and thus break acpi.h's
dependency on asm/realmode.h.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Link: https://lkml.kernel.org/r/20191126165417.22423-12-sean.j.christopherson@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/ia64/include/asm/acpi.h | 5 ++++-
 arch/ia64/kernel/acpi.c      | 2 --
 arch/x86/include/asm/acpi.h  | 5 ++++-
 drivers/acpi/sleep.c         | 3 +++
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index f886d4d..b66ba90 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -38,7 +38,10 @@ int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 /* Low-level suspend routine. */
 extern int acpi_suspend_lowlevel(void);
 
-extern unsigned long acpi_wakeup_address;
+static inline unsigned long acpi_get_wakeup_address(void)
+{
+	return 0;
+}
 
 /*
  * Record the cpei override flag and current logical cpu. This is
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 70d1587..a563652 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -42,8 +42,6 @@ int acpi_lapic;
 unsigned int acpi_cpei_override;
 unsigned int acpi_cpei_phys_cpuid;
 
-unsigned long acpi_wakeup_address = 0;
-
 #define ACPI_MAX_PLATFORM_INTERRUPTS	256
 
 /* Array to record platform interrupt vectors for generic interrupt routing. */
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index bc9693c..23ffafd 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -62,7 +62,10 @@ static inline void acpi_disable_pci(void)
 extern int (*acpi_suspend_lowlevel)(void);
 
 /* Physical address to resume after wakeup */
-#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start))
+static inline unsigned long acpi_get_wakeup_address(void)
+{
+	return ((unsigned long)(real_mode_header->wakeup_start));
+}
 
 /*
  * Check if the CPU can handle C2 and deeper
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 6747a27..4398806 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -61,8 +61,11 @@ static struct notifier_block tts_notifier = {
 static int acpi_sleep_prepare(u32 acpi_state)
 {
 #ifdef CONFIG_ACPI_SLEEP
+	unsigned long acpi_wakeup_address;
+
 	/* do we have a wakeup address for S2 and S3? */
 	if (acpi_state == ACPI_STATE_S3) {
+		acpi_wakeup_address = acpi_get_wakeup_address();
 		if (!acpi_wakeup_address)
 			return -EFAULT;
 		acpi_set_waking_vector(acpi_wakeup_address);