sparc64: Call xcall_deliver() directly in some cases.
For these cases the callers make sure:
1) The cpus indicated are online.
2) The current cpu is not in the list of indicated cpus.
Therefore we can pass a pointer to the mask directly.
One of the motivations in this transformation is to make use of
"&cpumask_of_cpu(cpu)" which evaluates to a pointer to constant
data in the kernel and thus takes up no stack space.
Hopefully someone in the future will change the interface of
arch_send_call_function_ipi() such that it passes a const cpumask_t
pointer so that this will optimize ever further.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 868625e..47b0738 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -792,16 +792,15 @@
void arch_send_call_function_ipi(cpumask_t mask)
{
- smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);
+ xcall_deliver((u64) &xcall_call_function, 0, 0, &mask);
}
extern unsigned long xcall_call_function_single;
void arch_send_call_function_single_ipi(int cpu)
{
- cpumask_t mask = cpumask_of_cpu(cpu);
-
- smp_cross_call_masked(&xcall_call_function_single, 0, 0, 0, mask);
+ xcall_deliver((u64) &xcall_call_function_single, 0, 0,
+ &cpumask_of_cpu(cpu));
}
/* Send cross call to all processors except self. */
@@ -959,24 +958,6 @@
put_cpu();
}
-static void __smp_receive_signal_mask(cpumask_t mask)
-{
- smp_cross_call_masked(&xcall_receive_signal, 0, 0, 0, mask);
-}
-
-void smp_receive_signal(int cpu)
-{
- cpumask_t mask = cpumask_of_cpu(cpu);
-
- if (cpu_online(cpu))
- __smp_receive_signal_mask(mask);
-}
-
-void smp_receive_signal_client(int irq, struct pt_regs *regs)
-{
- clear_softint(1 << irq);
-}
-
void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
{
struct mm_struct *mm;
@@ -1374,7 +1355,13 @@
void smp_send_reschedule(int cpu)
{
- smp_receive_signal(cpu);
+ xcall_deliver((u64) &xcall_receive_signal, 0, 0,
+ &cpumask_of_cpu(cpu));
+}
+
+void smp_receive_signal_client(int irq, struct pt_regs *regs)
+{
+ clear_softint(1 << irq);
}
/* This is a nop because we capture all other cpus