x86-32: add support for smp_send_pull_timers()

This establishes the architectures dependent bits for hrtimer_start_on()
on x86-32.

2 files changed, 19 insertions, 0 deletions

diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c
index 1063dfc498..e1c5aa316f 100644
--- a/arch/x86/kernel/smp_32.c
+++ b/arch/x86/kernel/smp_32.c
@@ -25,6 +25,8 @@
 #include <asm/mmu_context.h>
 #include <mach_apic.h>
 
+#include <litmus/litmus.h>
+
 /*
  *      Some notes on x86 processor bugs affecting SMP operation:
  *
@@ -475,6 +477,12 @@ static void native_smp_send_reschedule(int cpu)
         send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
 }
 
+void smp_send_pull_timers(int cpu)
+{
+        WARN_ON(cpu_is_offline(cpu));
+        send_IPI_mask(cpumask_of_cpu(cpu), PULL_TIMERS_VECTOR);
+}
+
 /*
  * Structure and data for smp_call_function(). This is designed to minimise
  * static memory requirements. It also looks cleaner.
@@ -645,6 +653,15 @@ fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
         __get_cpu_var(irq_stat).irq_resched_count++;
 }
 
+extern void hrtimer_pull(void);
+
+fastcall void smp_pull_timers_interrupt(struct pt_regs *regs)
+{
+        ack_APIC_irq();
+        TRACE("pull timers interrupt\n");
+        hrtimer_pull();
+}
+
 fastcall void smp_call_function_interrupt(struct pt_regs *regs)
 {
         void (*func) (void *info) = call_data->func;
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 4ea80cbe52..133cbb6118 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -1323,6 +1323,8 @@ void __init smp_intr_init(void)
 
         /* IPI for generic function call */
         set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+
+        set_intr_gate(PULL_TIMERS_VECTOR, pull_timers_interrupt);
 }
 
 /*