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sh: Provide cpu_idle_wait() to fix up cpuidle/SMP build.

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Crib the x86 cpu_idle_wait() implementation and shove it in with the
idle code, subsequently enabling ARCH_HAS_CPU_IDLE_WAIT.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-06-19 14:40:51 +09:00
parent d888a4c76c
commit 2e046b9487
3 changed files with 26 additions and 1 deletions
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3
arch/sh/Kconfig
View file

@ -151,6 +151,9 @@ config ARCH_NO_VIRT_TO_BUS
config ARCH_HAS_DEFAULT_IDLE
def_bool y
config ARCH_HAS_CPU_IDLE_WAIT
def_bool y
config IO_TRAPPED
bool

1
arch/sh/include/asm/system.h
View file

@ -154,6 +154,7 @@ extern struct dentry *sh_debugfs_root;
void per_cpu_trap_init(void);
void default_idle(void);
void cpu_idle_wait(void);
asmlinkage void break_point_trap(void);

23
arch/sh/kernel/idle.c
View file

@ -1,7 +1,7 @@
/*
* The idle loop for all SuperH platforms.
*
* Copyright (C) 2002 - 2008 Paul Mundt
* Copyright (C) 2002 - 2009 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@ -15,6 +15,7 @@
#include <linux/preempt.h>
#include <linux/thread_info.h>
#include <linux/irqflags.h>
#include <linux/smp.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/atomic.h>
@ -79,3 +80,23 @@ void cpu_idle(void)
check_pgt_cache();
}
}
static void do_nothing(void *unused)
{
}
/*
* cpu_idle_wait - Used to ensure that all the CPUs discard old value of
* pm_idle and update to new pm_idle value. Required while changing pm_idle
* handler on SMP systems.
*
* Caller must have changed pm_idle to the new value before the call. Old
* pm_idle value will not be used by any CPU after the return of this function.
*/
void cpu_idle_wait(void)
{
smp_mb();
/* kick all the CPUs so that they exit out of pm_idle */
smp_call_function(do_nothing, NULL, 1);
}
EXPORT_SYMBOL_GPL(cpu_idle_wait);