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arm: support restart through restart handler call chain 

The kernel core now supports a restart handler call chain for system
restart functions.

With this change, the arm_pm_restart callback is now optional, so drop its
initialization and check if it is set before calling it.  Only call the
kernel restart handler if arm_pm_restart is not set.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonas Jensen <jonas.jensen@gmail.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
hifive-unleashed-5.1
Guenter Roeck 2014-09-26 00:03:17 +00:00
parent 1c7ffc32ea
commit 1a9607a3be
1 changed files with 5 additions and 6 deletions
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11
arch/arm/kernel/process.c
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@ -114,17 +114,13 @@ void soft_restart(unsigned long addr)
BUG();
}
static void null_restart(enum reboot_mode reboot_mode, const char *cmd)
{
}
/*
* 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) = null_restart;
void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
EXPORT_SYMBOL_GPL(arm_pm_restart);
/*
@ -230,7 +226,10 @@ void machine_restart(char *cmd)
local_irq_disable();
smp_send_stop();
arm_pm_restart(reboot_mode, cmd);
if (arm_pm_restart)
arm_pm_restart(reboot_mode, cmd);
else
do_kernel_restart(cmd);
/* Give a grace period for failure to restart of 1s */
mdelay(1000);