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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-11-25 12:59:03 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-12-23 12:05:04 +0530 |
| commit | ddf84433f411b612e935a6719ee395bb9dd2221f (patch) | |
| tree | d9dab0c2b2b6aa73e1959149e21baf38031dc7ff /arch/arc | |
| parent | 413541dd66d51f791a0b169d9b9014e4f56be13c (diff) | |
| download | linux-ddf84433f411b612e935a6719ee395bb9dd2221f.tar.bz2 | |
ARC: [SMP] cpumask not needed in IPI send path
The current IPI sending callstack needlessly involves cpumask.
arch_send_call_function_single_ipi(cpu) / smp_send_reschedule(cpu)
ipi_send_msg(cpumask_of(cpu)) --> [cpu to cpumask]
plat_smp_ops.ipi_send(callmap)
for_each_cpu(callmap) --> [cpuask to cpu]
do_plat_specific_ipi_PER_CPU
Given that current backends are not capable of 1:N IPIs, lets simplify
the interface for now, by keeping "a" cpu all along.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/smp.h | 4 | ||||
| -rw-r--r-- | arch/arc/kernel/smp.c | 23 | ||||
| -rw-r--r-- | arch/arc/plat-arcfpga/smp.c | 8 |
3 files changed, 18 insertions, 17 deletions
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h index eefc29f08cdb..9b40e3bdc1ba 100644 --- a/arch/arc/include/asm/smp.h +++ b/arch/arc/include/asm/smp.h @@ -46,13 +46,13 @@ extern int smp_ipi_irq_setup(int cpu, int irq); * * @info: SoC SMP specific info for /proc/cpuinfo etc * @cpu_kick: For Master to kickstart a cpu (optionally at a PC) - * @ipi_send: To send IPI to a @cpumask + * @ipi_send: To send IPI to a @cpu * @ips_clear: To clear IPI received by @cpu at @irq */ struct plat_smp_ops { const char *info; void (*cpu_kick)(int cpu, unsigned long pc); - void (*ipi_send)(void *callmap); + void (*ipi_send)(int cpu); void (*ipi_clear)(int cpu, int irq); }; diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c index c2f9ebbc38f6..f2fdef964045 100644 --- a/arch/arc/kernel/smp.c +++ b/arch/arc/kernel/smp.c @@ -220,28 +220,33 @@ struct ipi_data { static DEFINE_PER_CPU(struct ipi_data, ipi_data); -static void ipi_send_msg(const struct cpumask *callmap, enum ipi_msg_type msg) +static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg) { + struct ipi_data *ipi = &per_cpu(ipi_data, cpu); unsigned long flags; - unsigned int cpu; local_irq_save(flags); - for_each_cpu(cpu, callmap) { - struct ipi_data *ipi = &per_cpu(ipi_data, cpu); - set_bit(msg, &ipi->bits); - } + set_bit(msg, &ipi->bits); /* Call the platform specific cross-CPU call function */ if (plat_smp_ops.ipi_send) - plat_smp_ops.ipi_send((void *)callmap); + plat_smp_ops.ipi_send(cpu); local_irq_restore(flags); } +static void ipi_send_msg(const struct cpumask *callmap, enum ipi_msg_type msg) +{ + unsigned int cpu; + + for_each_cpu(cpu, callmap) + ipi_send_msg_one(cpu, msg); +} + void smp_send_reschedule(int cpu) { - ipi_send_msg(cpumask_of(cpu), IPI_RESCHEDULE); + ipi_send_msg_one(cpu, IPI_RESCHEDULE); } void smp_send_stop(void) @@ -254,7 +259,7 @@ void smp_send_stop(void) void arch_send_call_function_single_ipi(int cpu) { - ipi_send_msg(cpumask_of(cpu), IPI_CALL_FUNC); + ipi_send_msg_one(cpu, IPI_CALL_FUNC); } void arch_send_call_function_ipi_mask(const struct cpumask *mask) diff --git a/arch/arc/plat-arcfpga/smp.c b/arch/arc/plat-arcfpga/smp.c index 91b55349a5f8..5e4fe959665c 100644 --- a/arch/arc/plat-arcfpga/smp.c +++ b/arch/arc/plat-arcfpga/smp.c @@ -88,13 +88,9 @@ void iss_model_init_smp(unsigned int cpu) smp_ipi_irq_setup(cpu, IDU_INTERRUPT_0 + cpu); } -static void iss_model_ipi_send(void *arg) +static void iss_model_ipi_send(int cpu) { - struct cpumask *callmap = arg; - unsigned int cpu; - - for_each_cpu(cpu, callmap) - idu_irq_assert(cpu); + idu_irq_assert(cpu); } static void iss_model_ipi_clear(int cpu, int irq) |