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s390/spinlock: optimize spinlock code sequence

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Use lowcore constant to improve the code generated for spinlocks.

[ Martin Schwidefsky: patch breakdown and code beautification ]

Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Philipp Hachtmann
2014-04-07 18:25:23 +02:00
committed by Martin Schwidefsky
parent 5b3f683e69
commit 6c8cd5bbda
5 changed files with 21 additions and 10 deletions
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4
arch/s390/kernel/setup.c
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@@ -373,6 +373,10 @@ static void __init setup_lowcore(void)
mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
#ifdef CONFIG_SMP
lc->spinlock_lockval = arch_spin_lockval(0);
#endif
set_prefix((u32)(unsigned long) lc);
lowcore_ptr[0] = lc;
}

3
arch/s390/kernel/smp.c
View File

@@ -170,6 +170,7 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
lc->panic_stack = pcpu->panic_stack + PAGE_SIZE
- STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
lc->cpu_nr = cpu;
lc->spinlock_lockval = arch_spin_lockval(cpu);
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lc->extended_save_area_addr = get_zeroed_page(GFP_KERNEL);
@@ -226,6 +227,7 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
cpumask_set_cpu(cpu, mm_cpumask(&init_mm));
atomic_inc(&init_mm.context.attach_count);
lc->cpu_nr = cpu;
lc->spinlock_lockval = arch_spin_lockval(cpu);
lc->percpu_offset = __per_cpu_offset[cpu];
lc->kernel_asce = S390_lowcore.kernel_asce;
lc->machine_flags = S390_lowcore.machine_flags;
@@ -809,6 +811,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
void __init smp_setup_processor_id(void)
{
S390_lowcore.cpu_nr = 0;
S390_lowcore.spinlock_lockval = arch_spin_lockval(0);
}
/*