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| author | Philipp Hachtmann <phacht@linux.vnet.ibm.com> | 2014-04-07 16:25:23 (GMT) |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-05-20 06:58:42 (GMT) |
| commit | 6c8cd5bbda7e6be166cf2e2dd4be5890193e17ac (patch) | |
| tree | 0245d1a206b04c2cd2b5b4914dfb696205673861 /arch/s390/kernel | |
| parent | 5b3f683e694a835f5dfdab06102be1a50604c3b7 (diff) | |
| download | linux-6c8cd5bbda7e6be166cf2e2dd4be5890193e17ac.tar.xz | |
s390/spinlock: optimize spinlock code sequence
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>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/setup.c | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 1f5536c..7c5b05f 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -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; } diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 86e65ec..1f0b474 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -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); } /* |