diff options
Diffstat (limited to 'arch/arm/mm/context.c')
| -rw-r--r-- | arch/arm/mm/context.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c index c9e9a5586267..fc84fcc74380 100644 --- a/arch/arm/mm/context.c +++ b/arch/arm/mm/context.c @@ -14,7 +14,8 @@ #include <asm/mmu_context.h> #include <asm/tlbflush.h> -unsigned int cpu_last_asid = { 1 << ASID_BITS }; +static DEFINE_SPINLOCK(cpu_asid_lock); +unsigned int cpu_last_asid = ASID_FIRST_VERSION; /* * We fork()ed a process, and we need a new context for the child @@ -31,15 +32,16 @@ void __new_context(struct mm_struct *mm) { unsigned int asid; + spin_lock(&cpu_asid_lock); asid = ++cpu_last_asid; if (asid == 0) - asid = cpu_last_asid = 1 << ASID_BITS; + asid = cpu_last_asid = ASID_FIRST_VERSION; /* * If we've used up all our ASIDs, we need * to start a new version and flush the TLB. */ - if ((asid & ~ASID_MASK) == 0) { + if (unlikely((asid & ~ASID_MASK) == 0)) { asid = ++cpu_last_asid; /* set the reserved ASID before flushing the TLB */ asm("mcr p15, 0, %0, c13, c0, 1 @ set reserved context ID\n" @@ -55,6 +57,8 @@ void __new_context(struct mm_struct *mm) dsb(); } } + spin_unlock(&cpu_asid_lock); + mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id()); mm->context.id = asid; } |