arm: convert to generic helpers for IPI function calls
This converts arm to use the new helpers for smp_call_function() and friends, and adds support for smp_call_function_single(). Fixups and testing done by Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
parent
c524a1d891
commit
f6dd9fa5a7
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@ -650,6 +650,7 @@ source "kernel/time/Kconfig"
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config SMP
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bool "Symmetric Multi-Processing (EXPERIMENTAL)"
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depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
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select USE_GENERIC_SMP_HELPERS
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help
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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@ -68,20 +68,10 @@ enum ipi_msg_type {
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IPI_TIMER,
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IPI_RESCHEDULE,
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IPI_CALL_FUNC,
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IPI_CALL_FUNC_SINGLE,
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IPI_CPU_STOP,
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};
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struct smp_call_struct {
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void (*func)(void *info);
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void *info;
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int wait;
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cpumask_t pending;
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cpumask_t unfinished;
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};
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static struct smp_call_struct * volatile smp_call_function_data;
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static DEFINE_SPINLOCK(smp_call_function_lock);
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int __cpuinit __cpu_up(unsigned int cpu)
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{
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struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
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@ -366,114 +356,15 @@ static void send_ipi_message(cpumask_t callmap, enum ipi_msg_type msg)
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local_irq_restore(flags);
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}
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/*
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* You must not call this function with disabled interrupts, from a
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* hardware interrupt handler, nor from a bottom half handler.
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*/
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static int smp_call_function_on_cpu(void (*func)(void *info), void *info,
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int retry, int wait, cpumask_t callmap)
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void arch_send_call_function_ipi(cpumask_t mask)
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{
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struct smp_call_struct data;
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unsigned long timeout;
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int ret = 0;
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data.func = func;
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data.info = info;
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data.wait = wait;
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cpu_clear(smp_processor_id(), callmap);
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if (cpus_empty(callmap))
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goto out;
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data.pending = callmap;
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if (wait)
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data.unfinished = callmap;
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/*
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* try to get the mutex on smp_call_function_data
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*/
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spin_lock(&smp_call_function_lock);
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smp_call_function_data = &data;
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send_ipi_message(callmap, IPI_CALL_FUNC);
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timeout = jiffies + HZ;
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while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
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barrier();
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/*
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* did we time out?
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*/
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if (!cpus_empty(data.pending)) {
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/*
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* this may be causing our panic - report it
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*/
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printk(KERN_CRIT
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"CPU%u: smp_call_function timeout for %p(%p)\n"
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" callmap %lx pending %lx, %swait\n",
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smp_processor_id(), func, info, *cpus_addr(callmap),
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*cpus_addr(data.pending), wait ? "" : "no ");
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/*
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* TRACE
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*/
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timeout = jiffies + (5 * HZ);
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while (!cpus_empty(data.pending) && time_before(jiffies, timeout))
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barrier();
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if (cpus_empty(data.pending))
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printk(KERN_CRIT " RESOLVED\n");
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else
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printk(KERN_CRIT " STILL STUCK\n");
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}
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/*
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* whatever happened, we're done with the data, so release it
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*/
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smp_call_function_data = NULL;
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spin_unlock(&smp_call_function_lock);
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if (!cpus_empty(data.pending)) {
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ret = -ETIMEDOUT;
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goto out;
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}
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if (wait)
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while (!cpus_empty(data.unfinished))
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barrier();
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out:
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return 0;
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send_ipi_message(mask, IPI_CALL_FUNC);
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}
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int smp_call_function(void (*func)(void *info), void *info, int retry,
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int wait)
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void arch_send_call_function_single_ipi(int cpu)
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{
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return smp_call_function_on_cpu(func, info, retry, wait,
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cpu_online_map);
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send_ipi_message(cpumask_of_cpu(cpu), IPI_CALL_FUNC_SINGLE);
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}
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EXPORT_SYMBOL_GPL(smp_call_function);
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int smp_call_function_single(int cpu, void (*func)(void *info), void *info,
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int retry, int wait)
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{
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/* prevent preemption and reschedule on another processor */
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int current_cpu = get_cpu();
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int ret = 0;
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if (cpu == current_cpu) {
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local_irq_disable();
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func(info);
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local_irq_enable();
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} else
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ret = smp_call_function_on_cpu(func, info, retry, wait,
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cpumask_of_cpu(cpu));
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put_cpu();
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return ret;
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}
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EXPORT_SYMBOL_GPL(smp_call_function_single);
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void show_ipi_list(struct seq_file *p)
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{
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@ -521,27 +412,6 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs)
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}
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#endif
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/*
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* ipi_call_function - handle IPI from smp_call_function()
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*
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* Note that we copy data out of the cross-call structure and then
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* let the caller know that we're here and have done with their data
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*/
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static void ipi_call_function(unsigned int cpu)
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{
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struct smp_call_struct *data = smp_call_function_data;
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void (*func)(void *info) = data->func;
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void *info = data->info;
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int wait = data->wait;
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cpu_clear(cpu, data->pending);
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func(info);
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if (wait)
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cpu_clear(cpu, data->unfinished);
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}
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static DEFINE_SPINLOCK(stop_lock);
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/*
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@ -611,7 +481,11 @@ asmlinkage void __exception do_IPI(struct pt_regs *regs)
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break;
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case IPI_CALL_FUNC:
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ipi_call_function(cpu);
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generic_smp_call_function_interrupt();
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break;
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case IPI_CALL_FUNC_SINGLE:
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generic_smp_call_function_single_interrupt();
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break;
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case IPI_CPU_STOP:
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@ -662,14 +536,13 @@ int setup_profiling_timer(unsigned int multiplier)
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}
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static int
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on_each_cpu_mask(void (*func)(void *), void *info, int retry, int wait,
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cpumask_t mask)
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on_each_cpu_mask(void (*func)(void *), void *info, int wait, cpumask_t mask)
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{
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int ret = 0;
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preempt_disable();
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ret = smp_call_function_on_cpu(func, info, retry, wait, mask);
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ret = smp_call_function_mask(mask, func, info, wait);
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if (cpu_isset(smp_processor_id(), mask))
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func(info);
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@ -738,7 +611,7 @@ void flush_tlb_mm(struct mm_struct *mm)
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{
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cpumask_t mask = mm->cpu_vm_mask;
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on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, 1, mask);
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on_each_cpu_mask(ipi_flush_tlb_mm, mm, 1, mask);
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}
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
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@ -749,7 +622,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
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ta.ta_vma = vma;
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ta.ta_start = uaddr;
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on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, 1, mask);
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on_each_cpu_mask(ipi_flush_tlb_page, &ta, 1, mask);
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}
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void flush_tlb_kernel_page(unsigned long kaddr)
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@ -771,7 +644,7 @@ void flush_tlb_range(struct vm_area_struct *vma,
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ta.ta_start = start;
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ta.ta_end = end;
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on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, 1, mask);
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on_each_cpu_mask(ipi_flush_tlb_range, &ta, 1, mask);
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}
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void flush_tlb_kernel_range(unsigned long start, unsigned long end)
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@ -101,6 +101,9 @@ extern void platform_cpu_die(unsigned int cpu);
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extern int platform_cpu_kill(unsigned int cpu);
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extern void platform_cpu_enable(unsigned int cpu);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi(cpumask_t mask);
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/*
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* Local timer interrupt handling function (can be IPI'ed).
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*/
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