[PATCH v3 08/47] kernel: Move pm_power_off to common code

From: Guenter Roeck
Date: Mon Oct 27 2014 - 12:09:54 EST

pm_power_off is defined for all architectures. Move it to common code.

Have all architectures call do_kernel_power_off instead of pm_power_off.
Some architectures point pm_power_off to machine_power_off. For those,
call do_kernel_power_off from machine_power_off instead.

Acked-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: Hirokazu Takata <takata@xxxxxxxxxxxxxx>
Acked-by: James Hogan <james.hogan@xxxxxxxxxx>
Acked-by: Jesper Nilsson <jesper.nilsson@xxxxxxxx>
Acked-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Acked-by: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Acked-by: Richard Weinberger <richard@xxxxxx>
Acked-by: Xuetao Guan <gxt@xxxxxxxxxxxxxxx>
Acked-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v3:
- Replace poweroff in all newly introduced variables and in text
with power_off or power-off as appropriate
v2:
- do_kernel_poweroff -> do_kernel_power_off
- have_kernel_poweroff -> have_kernel_power_off

arch/alpha/kernel/process.c | 9 +++------
arch/arc/kernel/reset.c | 5 +----
arch/arm/kernel/process.c | 5 +----
arch/arm64/kernel/process.c | 5 +----
arch/avr32/kernel/process.c | 6 +-----
arch/blackfin/kernel/process.c | 3 ---
arch/blackfin/kernel/reboot.c | 2 ++
arch/c6x/kernel/process.c | 9 +--------
arch/cris/kernel/process.c | 4 +---
arch/frv/kernel/process.c | 5 ++---
arch/hexagon/kernel/reset.c | 5 ++---
arch/ia64/kernel/process.c | 5 +----
arch/m32r/kernel/process.c | 8 ++++----
arch/m68k/kernel/process.c | 6 +-----
arch/metag/kernel/process.c | 6 +-----
arch/microblaze/kernel/process.c | 3 ---
arch/microblaze/kernel/reset.c | 1 +
arch/mips/kernel/reset.c | 6 +-----
arch/mn10300/kernel/process.c | 8 ++------
arch/openrisc/kernel/process.c | 8 +++++---
arch/parisc/kernel/process.c | 8 ++++----
arch/powerpc/kernel/setup-common.c | 6 +++---
arch/s390/kernel/setup.c | 8 ++------
arch/score/kernel/process.c | 8 ++++----
arch/sh/kernel/reboot.c | 6 +-----
arch/sparc/kernel/process_32.c | 10 ++--------
arch/sparc/kernel/reboot.c | 8 ++------
arch/tile/kernel/reboot.c | 7 +++----
arch/um/kernel/reboot.c | 2 --
arch/unicore32/kernel/process.c | 9 +--------
arch/x86/kernel/reboot.c | 11 +++--------
arch/x86/xen/enlighten.c | 3 +--
arch/xtensa/kernel/process.c | 4 ----
drivers/parisc/power.c | 3 +--
kernel/power/power_off_handler.c | 8 ++++++++
kernel/reboot.c | 4 ++--
36 files changed, 68 insertions(+), 146 deletions(-)

diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 1941a07..81c43f8 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -24,6 +24,7 @@
#include <linux/vt.h>
#include <linux/mman.h>
#include <linux/elfcore.h>
+#include <linux/pm.h>
#include <linux/reboot.h>
#include <linux/tty.h>
#include <linux/console.h>
@@ -40,12 +41,6 @@
#include "proto.h"
#include "pci_impl.h"

-/*
- * Power off function, if any
- */
-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
#ifdef CONFIG_ALPHA_WTINT
/*
* Sleep the CPU.
@@ -184,6 +179,8 @@ machine_halt(void)
void
machine_power_off(void)
{
+ do_kernel_power_off();
+
common_shutdown(LINUX_REBOOT_CMD_POWER_OFF, NULL);
}

diff --git a/arch/arc/kernel/reset.c b/arch/arc/kernel/reset.c
index 2768fa1..0758d9d 100644
--- a/arch/arc/kernel/reset.c
+++ b/arch/arc/kernel/reset.c
@@ -26,9 +26,6 @@ void machine_restart(char *__unused)

void machine_power_off(void)
{
- /* FIXME :: power off ??? */
+ do_kernel_power_off();
machine_halt();
}
-
-void (*pm_power_off) (void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index fe972a2..aa3f656 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -117,8 +117,6 @@ void soft_restart(unsigned long addr)
/*
* Function pointers to optional machine specific functions
*/
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);

void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);

@@ -205,8 +203,7 @@ void machine_power_off(void)
local_irq_disable();
smp_send_stop();

- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
}

/*
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index fde9923..6f623a0 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -68,8 +68,6 @@ void soft_restart(unsigned long addr)
/*
* Function pointers to optional machine specific functions
*/
-void (*pm_power_off)(void);
-EXPORT_SYMBOL_GPL(pm_power_off);

void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);

@@ -129,8 +127,7 @@ void machine_power_off(void)
{
local_irq_disable();
smp_send_stop();
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
}

/*
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 42a53e74..529c1f6 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -23,9 +23,6 @@

#include <mach/pm.h>

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
/*
* This file handles the architecture-dependent parts of process handling..
*/
@@ -48,8 +45,7 @@ void machine_halt(void)

void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
}

void machine_restart(char *cmd)
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 4aa5545..812dd83 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -39,9 +39,6 @@ int nr_l1stack_tasks;
void *l1_stack_base;
unsigned long l1_stack_len;

-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
/*
* The idle loop on BFIN
*/
diff --git a/arch/blackfin/kernel/reboot.c b/arch/blackfin/kernel/reboot.c
index c4f50a3..387d610 100644
--- a/arch/blackfin/kernel/reboot.c
+++ b/arch/blackfin/kernel/reboot.c
@@ -7,6 +7,7 @@
*/

#include <linux/interrupt.h>
+#include <linux/pm.h>
#include <asm/bfin-global.h>
#include <asm/reboot.h>
#include <asm/bfrom.h>
@@ -106,6 +107,7 @@ void machine_halt(void)
__attribute__((weak))
void native_machine_power_off(void)
{
+ do_kernel_power_off();
idle_with_irq_disabled();
}

diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index 57d2ea8..edf7e5a 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -27,12 +27,6 @@ void (*c6x_halt)(void);
extern asmlinkage void ret_from_fork(void);
extern asmlinkage void ret_from_kernel_thread(void);

-/*
- * power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
void arch_cpu_idle(void)
{
unsigned long tmp;
@@ -73,8 +67,7 @@ void machine_halt(void)

void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
halt_loop();
}

diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c
index b78498e..9ebd76b 100644
--- a/arch/cris/kernel/process.c
+++ b/arch/cris/kernel/process.c
@@ -31,9 +31,6 @@

extern void default_idle(void);

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
void arch_cpu_idle(void)
{
default_idle();
@@ -60,6 +57,7 @@ void machine_halt(void)

void machine_power_off(void)
{
+ do_kernel_power_off();
}

/*
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index 5d40aeb77..502dabb 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -42,9 +42,6 @@ asmlinkage void ret_from_kernel_thread(void);

#include <asm/pgalloc.h>

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
static void core_sleep_idle(void)
{
#ifdef LED_DEBUG_SLEEP
@@ -107,6 +104,8 @@ void machine_power_off(void)
gdbstub_exit(0);
#endif

+ do_kernel_power_off();
+
for (;;);
}

diff --git a/arch/hexagon/kernel/reset.c b/arch/hexagon/kernel/reset.c
index 76483c1..6f607b6 100644
--- a/arch/hexagon/kernel/reset.c
+++ b/arch/hexagon/kernel/reset.c
@@ -16,11 +16,13 @@
* 02110-1301, USA.
*/

+#include <linux/pm.h>
#include <linux/smp.h>
#include <asm/hexagon_vm.h>

void machine_power_off(void)
{
+ do_kernel_power_off();
smp_send_stop();
__vmstop();
}
@@ -32,6 +34,3 @@ void machine_halt(void)
void machine_restart(char *cmd)
{
}
-
-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index b515149..88121a2 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -57,8 +57,6 @@ void (*ia64_mark_idle)(int);

unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);
-void (*pm_power_off) (void);
-EXPORT_SYMBOL(pm_power_off);

void
ia64_do_show_stack (struct unw_frame_info *info, void *arg)
@@ -675,8 +673,7 @@ machine_halt (void)
void
machine_power_off (void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
machine_halt();
}

diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index e69221d..65a037e 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -23,6 +23,7 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/pm.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/hardirq.h>
@@ -44,9 +45,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return tsk->thread.lr;
}

-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
void machine_restart(char *__unused)
{
#if defined(CONFIG_PLAT_MAPPI3)
@@ -67,7 +65,9 @@ void machine_halt(void)

void machine_power_off(void)
{
- /* M32R_FIXME */
+ do_kernel_power_off();
+ for (;;)
+ ;
}

void show_regs(struct pt_regs * regs)
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index afe3d6e..bbc0a63 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -78,14 +78,10 @@ void machine_halt(void)

void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
for (;;);
}

-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
void show_regs(struct pt_regs * regs)
{
printk("\n");
diff --git a/arch/metag/kernel/process.c b/arch/metag/kernel/process.c
index 483dff9..8d95773 100644
--- a/arch/metag/kernel/process.c
+++ b/arch/metag/kernel/process.c
@@ -67,9 +67,6 @@ void arch_cpu_idle_dead(void)
}
#endif

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
void (*soc_restart)(char *cmd);
void (*soc_halt)(void);

@@ -90,8 +87,7 @@ void machine_halt(void)

void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
smp_send_stop();
hard_processor_halt(HALT_OK);
}
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index b2dd371..0ebca36 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -44,9 +44,6 @@ void show_regs(struct pt_regs *regs)
regs->msr, regs->ear, regs->esr, regs->fsr);
}

-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
void flush_thread(void)
{
}
diff --git a/arch/microblaze/kernel/reset.c b/arch/microblaze/kernel/reset.c
index fbe58c6..2c6b32c 100644
--- a/arch/microblaze/kernel/reset.c
+++ b/arch/microblaze/kernel/reset.c
@@ -103,6 +103,7 @@ void machine_halt(void)
void machine_power_off(void)
{
pr_notice("Machine power off...\n");
+ do_kernel_power_off();
while (1)
;
}
diff --git a/arch/mips/kernel/reset.c b/arch/mips/kernel/reset.c
index 07fc524..09e74d2 100644
--- a/arch/mips/kernel/reset.c
+++ b/arch/mips/kernel/reset.c
@@ -21,9 +21,6 @@
*/
void (*_machine_restart)(char *command);
void (*_machine_halt)(void);
-void (*pm_power_off)(void);
-
-EXPORT_SYMBOL(pm_power_off);

void machine_restart(char *command)
{
@@ -39,6 +36,5 @@ void machine_halt(void)

void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
}
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 3707da5..c78b2eb 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -20,6 +20,7 @@
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <linux/pm.h>
#include <linux/reboot.h>
#include <linux/percpu.h>
#include <linux/err.h>
@@ -45,12 +46,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
}

/*
- * power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-/*
* On SMP it's slightly faster (but much more power-consuming!)
* to poll the ->work.need_resched flag instead of waiting for the
* cross-CPU IPI to arrive. Use this option with caution.
@@ -93,6 +88,7 @@ void machine_power_off(void)
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
+ do_kernel_power_off();
}

void show_regs(struct pt_regs *regs)
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index 386af25..494afd2 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -25,6 +25,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>
+#include <linux/pm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
@@ -51,7 +52,7 @@
*/
struct thread_info *current_thread_info_set[NR_CPUS] = { &init_thread_info, };

-void machine_restart(void)
+void machine_restart(char *cmd)
{
printk(KERN_INFO "*** MACHINE RESTART ***\n");
__asm__("l.nop 1");
@@ -72,11 +73,12 @@ void machine_halt(void)
void machine_power_off(void)
{
printk(KERN_INFO "*** MACHINE POWER OFF ***\n");
+
+ do_kernel_power_off();
+
__asm__("l.nop 1");
}

-void (*pm_power_off) (void) = machine_power_off;
-
/*
* When a process does an "exec", machine state like FPU and debug
* registers need to be reset. This is a hook function for that.
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 0bbbf0d..3f5d14a 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -41,6 +41,7 @@
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/personality.h>
+#include <linux/pm.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -133,7 +134,9 @@ void machine_power_off(void)
pdc_soft_power_button(0);

pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
-
+
+ do_kernel_power_off();
+
/* It seems we have no way to power the system off via
* software. The user has to press the button himself. */

@@ -141,9 +144,6 @@ void machine_power_off(void)
"Please power this system off now.");
}

-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
/*
* Free current thread data structures etc..
*/
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 1362cd6..5b7a851 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -141,6 +141,9 @@ void machine_power_off(void)
machine_shutdown();
if (ppc_md.power_off)
ppc_md.power_off();
+
+ do_kernel_power_off();
+
#ifdef CONFIG_SMP
smp_send_stop();
#endif
@@ -151,9 +154,6 @@ void machine_power_off(void)
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);

-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL_GPL(pm_power_off);
-
void machine_halt(void)
{
machine_shutdown();
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index e80d9ff..267e025 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -263,13 +263,9 @@ void machine_power_off(void)
*/
console_unblank();
_machine_power_off();
-}

-/*
- * Dummy power off function.
- */
-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL_GPL(pm_power_off);
+ do_kernel_power_off();
+}

static int __init early_parse_mem(char *p)
{
diff --git a/arch/score/kernel/process.c b/arch/score/kernel/process.c
index a1519ad3..b76ea67 100644
--- a/arch/score/kernel/process.c
+++ b/arch/score/kernel/process.c
@@ -29,9 +29,6 @@
#include <linux/pm.h>
#include <linux/rcupdate.h>

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
/* If or when software machine-restart is implemented, add code here. */
void machine_restart(char *command) {}

@@ -39,7 +36,10 @@ void machine_restart(char *command) {}
void machine_halt(void) {}

/* If or when software machine-power-off is implemented, add code here. */
-void machine_power_off(void) {}
+void machine_power_off(void)
+{
+ do_kernel_power_off();
+}

void ret_from_fork(void);
void ret_from_kernel_thread(void);
diff --git a/arch/sh/kernel/reboot.c b/arch/sh/kernel/reboot.c
index 04afe5b..065de12 100644
--- a/arch/sh/kernel/reboot.c
+++ b/arch/sh/kernel/reboot.c
@@ -11,9 +11,6 @@
#include <asm/tlbflush.h>
#include <asm/traps.h>

-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
#ifdef CONFIG_SUPERH32
static void watchdog_trigger_immediate(void)
{
@@ -51,8 +48,7 @@ static void native_machine_shutdown(void)

static void native_machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
}

static void native_machine_halt(void)
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 50e7b62..cb8148a 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -48,14 +48,6 @@
*/
void (*sparc_idle)(void);

-/*
- * Power-off handler instantiation for pm.h compliance
- * This is done via auxio, but could be used as a fallback
- * handler when auxio is not present-- unused for now...
- */
-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
/*
* sysctl - toggle power-off restriction for serial console
* systems in machine_power_off()
@@ -112,6 +104,8 @@ void machine_power_off(void)
sbus_writeb(power_register, auxio_power_register);
}

+ do_kernel_power_off();
+
machine_halt();
}

diff --git a/arch/sparc/kernel/reboot.c b/arch/sparc/kernel/reboot.c
index eba7d91..3c0bb03 100644
--- a/arch/sparc/kernel/reboot.c
+++ b/arch/sparc/kernel/reboot.c
@@ -16,17 +16,13 @@
*/
int scons_pwroff = 1;

-/* This isn't actually used, it exists merely to satisfy the
- * reference in kernel/sys.c
- */
-void (*pm_power_off)(void) = machine_power_off;
-EXPORT_SYMBOL(pm_power_off);
-
void machine_power_off(void)
{
if (strcmp(of_console_device->type, "serial") || scons_pwroff)
prom_halt_power_off();

+ do_kernel_power_off();
+
prom_halt();
}

diff --git a/arch/tile/kernel/reboot.c b/arch/tile/kernel/reboot.c
index 6c5d2c0..8ff4a7f 100644
--- a/arch/tile/kernel/reboot.c
+++ b/arch/tile/kernel/reboot.c
@@ -36,6 +36,9 @@ void machine_power_off(void)
{
arch_local_irq_disable_all();
smp_send_stop();
+
+ do_kernel_power_off();
+
hv_power_off();
}

@@ -45,7 +48,3 @@ void machine_restart(char *cmd)
smp_send_stop();
hv_restart((HV_VirtAddr) "vmlinux", (HV_VirtAddr) cmd);
}
-
-/* No interesting distinction to be made here. */
-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
index ced8903..a82ef28 100644
--- a/arch/um/kernel/reboot.c
+++ b/arch/um/kernel/reboot.c
@@ -11,8 +11,6 @@
#include <os.h>
#include <skas.h>

-void (*pm_power_off)(void);
-
static void kill_off_processes(void)
{
if (proc_mm)
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index b008e99..9490dd5 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -56,16 +56,9 @@ void machine_halt(void)
gpio_set_value(GPO_SOFT_OFF, 0);
}

-/*
- * Function pointers to optional machine specific functions
- */
-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
void machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
machine_halt();
}

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 17962e6..5c09e28 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -30,12 +30,6 @@
#include <asm/x86_init.h>
#include <asm/efi.h>

-/*
- * Power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
static const struct desc_ptr no_idt = {};

/*
@@ -647,11 +641,12 @@ static void native_machine_halt(void)

static void native_machine_power_off(void)
{
- if (pm_power_off) {
+ if (have_kernel_power_off()) {
if (!reboot_force)
machine_shutdown();
- pm_power_off();
+ do_kernel_power_off();
}
+
/* A fallback in case there is no PM info available */
tboot_shutdown(TB_SHUTDOWN_HALT);
}
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index fac5e4f..bc08998 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1320,8 +1320,7 @@ static void xen_machine_halt(void)

static void xen_machine_power_off(void)
{
- if (pm_power_off)
- pm_power_off();
+ do_kernel_power_off();
xen_reboot(SHUTDOWN_poweroff);
}

diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c
index 1c85323..c487296 100644
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -49,10 +49,6 @@ extern void ret_from_kernel_thread(void);

struct task_struct *current_set[NR_CPUS] = {&init_task, };

-void (*pm_power_off)(void) = NULL;
-EXPORT_SYMBOL(pm_power_off);
-
-
#if XTENSA_HAVE_COPROCESSORS

void coprocessor_release_all(struct thread_info *ti)
diff --git a/drivers/parisc/power.c b/drivers/parisc/power.c
index ef31b77..f10cf92 100644
--- a/drivers/parisc/power.c
+++ b/drivers/parisc/power.c
@@ -95,8 +95,7 @@ static void process_shutdown(void)
/* send kill signal */
if (kill_cad_pid(SIGINT, 1)) {
/* just in case killing init process failed */
- if (pm_power_off)
- pm_power_off();
+ kernel_power_off();
}
}
}
diff --git a/kernel/power/power_off_handler.c b/kernel/power/power_off_handler.c
index f838e63..97b7163 100644
--- a/kernel/power/power_off_handler.c
+++ b/kernel/power/power_off_handler.c
@@ -22,6 +22,12 @@
#include <linux/types.h>

/*
+ * If set, calling this function will power off the system immediately.
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+/*
* Notifier list for kernel code which wants to be called
* to power off the system.
*/
@@ -253,6 +259,8 @@ void do_kernel_power_off(void)
* removed while the call chain is traversed, but we'll have to carry
* that risk.
*/
+ if (pm_power_off)
+ pm_power_off();
raw_notifier_call_chain(&power_off_handler_list, 0, NULL);
}

diff --git a/kernel/reboot.c b/kernel/reboot.c
index 5925f5a..d87d921 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -306,9 +306,9 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
return ret;

/* Instead of trying to make the power_off code look like
- * halt when pm_power_off is not set do it the easy way.
+ * halt when no power-off handler exists do it the easy way.
*/
- if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
+ if (cmd == LINUX_REBOOT_CMD_POWER_OFF && !have_kernel_power_off())
cmd = LINUX_REBOOT_CMD_HALT;

mutex_lock(&reboot_mutex);
--
1.9.1

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