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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:50:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 07:50:17 -0700
commit8700c95adb033843fc163d112b9d21d4fda78018 (patch)
tree7bb9a37b8fe6328f63a61d88063c556346001098 /arch/cris
parent16fa94b532b1958f508e07eca1a9256351241fbc (diff)
parentd190e8195b90bc1e65c494fe08e54e9e581bfd16 (diff)
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull SMP/hotplug changes from Ingo Molnar: "This is a pretty large, multi-arch series unifying and generalizing the various disjunct pieces of idle routines that architectures have historically copied from each other and have grown in random, wildly inconsistent and sometimes buggy directions: 101 files changed, 455 insertions(+), 1328 deletions(-) this went through a number of review and test iterations before it was committed, it was tested on various architectures, was exposed to linux-next for quite some time - nevertheless it might cause problems on architectures that don't read the mailing lists and don't regularly test linux-next. This cat herding excercise was motivated by the -rt kernel, and was brought to you by Thomas "the Whip" Gleixner." * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits) idle: Remove GENERIC_IDLE_LOOP config switch um: Use generic idle loop ia64: Make sure interrupts enabled when we "safe_halt()" sparc: Use generic idle loop idle: Remove unused ARCH_HAS_DEFAULT_IDLE bfin: Fix typo in arch_cpu_idle() xtensa: Use generic idle loop x86: Use generic idle loop unicore: Use generic idle loop tile: Use generic idle loop tile: Enter idle with preemption disabled sh: Use generic idle loop score: Use generic idle loop s390: Use generic idle loop powerpc: Use generic idle loop parisc: Use generic idle loop openrisc: Use generic idle loop mn10300: Use generic idle loop mips: Use generic idle loop microblaze: Use generic idle loop ...
Diffstat (limited to 'arch/cris')
-rw-r--r--arch/cris/arch-v10/kernel/process.c3
-rw-r--r--arch/cris/arch-v32/kernel/process.c12
-rw-r--r--arch/cris/arch-v32/kernel/smp.c4
-rw-r--r--arch/cris/include/asm/processor.h7
-rw-r--r--arch/cris/kernel/process.c49
5 files changed, 8 insertions, 67 deletions
diff --git a/arch/cris/arch-v10/kernel/process.c b/arch/cris/arch-v10/kernel/process.c
index b1018750cffb..2ba23c13df68 100644
--- a/arch/cris/arch-v10/kernel/process.c
+++ b/arch/cris/arch-v10/kernel/process.c
@@ -30,8 +30,9 @@ void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
void default_idle(void)
{
#ifdef CONFIG_ETRAX_GPIO
- etrax_gpio_wake_up_check();
+ etrax_gpio_wake_up_check();
#endif
+ local_irq_enable();
}
/*
diff --git a/arch/cris/arch-v32/kernel/process.c b/arch/cris/arch-v32/kernel/process.c
index 2b23ef0e4452..57451faa9b20 100644
--- a/arch/cris/arch-v32/kernel/process.c
+++ b/arch/cris/arch-v32/kernel/process.c
@@ -20,18 +20,12 @@
extern void stop_watchdog(void);
-extern int cris_hlt_counter;
-
/* We use this if we don't have any better idle routine. */
void default_idle(void)
{
- local_irq_disable();
- if (!need_resched() && !cris_hlt_counter) {
- /* Halt until exception. */
- __asm__ volatile("ei \n\t"
- "halt ");
- }
- local_irq_enable();
+ /* Halt until exception. */
+ __asm__ volatile("ei \n\t"
+ "halt ");
}
/*
diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
index 04a16edd5401..cdd12028de0c 100644
--- a/arch/cris/arch-v32/kernel/smp.c
+++ b/arch/cris/arch-v32/kernel/smp.c
@@ -145,8 +145,6 @@ smp_boot_one_cpu(int cpuid, struct task_struct idle)
* specific stuff such as the local timer and the MMU. */
void __init smp_callin(void)
{
- extern void cpu_idle(void);
-
int cpu = cpu_now_booting;
reg_intr_vect_rw_mask vect_mask = {0};
@@ -170,7 +168,7 @@ void __init smp_callin(void)
local_irq_enable();
set_cpu_online(cpu, true);
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);
}
/* Stop execution on this CPU.*/
diff --git a/arch/cris/include/asm/processor.h b/arch/cris/include/asm/processor.h
index 675823f70c0f..c0a29b96b92b 100644
--- a/arch/cris/include/asm/processor.h
+++ b/arch/cris/include/asm/processor.h
@@ -65,13 +65,6 @@ static inline void release_thread(struct task_struct *dead_task)
#define cpu_relax() barrier()
-/*
- * disable hlt during certain critical i/o operations
- */
-#define HAVE_DISABLE_HLT
-void disable_hlt(void);
-void enable_hlt(void);
-
void default_idle(void);
#endif /* __ASM_CRIS_PROCESSOR_H */
diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c
index 104ff4dd9b98..b78498eb079b 100644
--- a/arch/cris/kernel/process.c
+++ b/arch/cris/kernel/process.c
@@ -29,59 +29,14 @@
//#define DEBUG
-/*
- * The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
- * there would ever be a halt sequence (for power save when idle) with
- * some largish delay when halting or resuming *and* a driver that can't
- * afford that delay. The hlt_counter would then be checked before
- * executing the halt sequence, and the driver marks the unhaltable
- * region by enable_hlt/disable_hlt.
- */
-
-int cris_hlt_counter=0;
-
-void disable_hlt(void)
-{
- cris_hlt_counter++;
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
- cris_hlt_counter--;
-}
-
-EXPORT_SYMBOL(enable_hlt);
-
extern void default_idle(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-
-void cpu_idle (void)
+void arch_cpu_idle(void)
{
- /* endless idle loop with no priority at all */
- while (1) {
- rcu_idle_enter();
- while (!need_resched()) {
- /*
- * Mark this as an RCU critical section so that
- * synchronize_kernel() in the unload path waits
- * for our completion.
- */
- default_idle();
- }
- rcu_idle_exit();
- schedule_preempt_disabled();
- }
+ default_idle();
}
void hard_reset_now (void);