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arm64: percpu: implement optimised pcpu access using tpidr_el1

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This patch implements optimised percpu variable accesses using the
el1 r/w thread register (tpidr_el1) along the same lines as arch/arm/.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon
2013-11-05 18:10:47 +00:00
committed by Catalin Marinas
parent 66aa8d6a14
commit 7158627686
4 changed files with 55 additions and 3 deletions
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6
arch/arm64/kernel/smp.c
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@@ -122,8 +122,6 @@ asmlinkage void secondary_start_kernel(void)
struct mm_struct *mm = &init_mm;
unsigned int cpu = smp_processor_id();
printk("CPU%u: Booted secondary processor\n", cpu);
/*
* All kernel threads share the same mm context; grab a
* reference and switch to it.
@@ -132,6 +130,9 @@ asmlinkage void secondary_start_kernel(void)
current->active_mm = mm;
cpumask_set_cpu(cpu, mm_cpumask(mm));
set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
printk("CPU%u: Booted secondary processor\n", cpu);
/*
* TTBR0 is only used for the identity mapping at this stage. Make it
* point to zero page to avoid speculatively fetching new entries.
@@ -271,6 +272,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
void __init smp_prepare_boot_cpu(void)
{
set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
}
static void (*smp_cross_call)(const struct cpumask *, unsigned int);