diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2013-03-21 21:49:36 (GMT) |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-04-08 15:39:23 (GMT) |
| commit | fa35e42a00ec0120db2b5128753206efb288e789 (patch) | |
| tree | 9327391650b78e260cc2f16d6c1c676584a77425 | |
| parent | d166991234347215dc23fc9dc15a63a83a1a54e1 (diff) | |
| download | linux-fsl-qoriq-fa35e42a00ec0120db2b5128753206efb288e789.tar.xz | |
arc: Use generic idle loop
The generic idle loop implements all functionality. Aside of that it
allows arc to implement the tsk_is_polling() functionality correctly,
despite the patently (now gone) comment in the original arc cpu_idle()
function:
/* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
See kernel/cpu/idle.c
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>
Link: http://lkml.kernel.org/r/20130321215233.711253792@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/arc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arc/kernel/process.c | 27 | ||||
| -rw-r--r-- | arch/arc/kernel/smp.c | 2 |
3 files changed, 3 insertions, 27 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index e6f4eca..b006977 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -14,6 +14,7 @@ config ARC select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS select GENERIC_FIND_FIRST_BIT + select GENERIC_IDLE_LOOP # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW select GENERIC_KERNEL_EXECVE diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index 0a7531d..cad6685 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -41,37 +41,12 @@ SYSCALL_DEFINE0(arc_gettls) return task_thread_info(current)->thr_ptr; } -static inline void arch_idle(void) +void arch_cpu_idle(void) { /* sleep, but enable all interrupts before committing */ __asm__("sleep 0x3"); } -void cpu_idle(void) -{ - /* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */ - - /* endless idle loop with no priority at all */ - while (1) { - tick_nohz_idle_enter(); - rcu_idle_enter(); - -doze: - local_irq_disable(); - if (!need_resched()) { - arch_idle(); - goto doze; - } else { - local_irq_enable(); - } - - rcu_idle_exit(); - tick_nohz_idle_exit(); - - schedule_preempt_disabled(); - } -} - asmlinkage void ret_from_fork(void); /* Layout of Child kernel mode stack as setup at the end of this function is diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c index 3af3e06..5c7fd60 100644 --- a/arch/arc/kernel/smp.c +++ b/arch/arc/kernel/smp.c @@ -141,7 +141,7 @@ void __cpuinit start_kernel_secondary(void) local_irq_enable(); preempt_disable(); - cpu_idle(); + cpu_startup_entry(CPUHP_ONLINE); } /* |