Subject: [PATCH v2 16/17] ARM: Kill __smp_cross_call and co

From: Marc Zyngier <[email-masked]>
Date: Wed, 24 Jun 2020 20:58:10 +0100

The old IPI registration interface is now unused on arm, so let's
get rid of it.

Signed-off-by: Marc Zyngier <[email-masked]>
---
 arch/arm/include/asm/smp.h |  6 ------
 arch/arm/kernel/smp.c      | 22 +++++-----------------
 2 files changed, 5 insertions(+), 23 deletions(-)

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 0e29730295ca..0ca55a607d0a 100644
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -39,12 +39,6 @@ void handle_IPI(int ipinr, struct pt_regs *regs);
  */
 extern void smp_init_cpus(void);
 
-
-/*
- * Provide a function to raise an IPI cross call on CPUs in callmap.
- */
-extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
-
 /*
  * Register IPI interrupts with the arch SMP code
  */
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 269639b14259..285980c2a437 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -514,14 +514,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 }
 
-static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
-
-void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
-{
-	if (!__smp_cross_call)
-		__smp_cross_call = fn;
-}
-
 static const char *ipi_types[NR_IPI] __tracepoint_string = {
 #define S(x,s)	[x] = s
 	S(IPI_WAKEUP, "CPU wakeup interrupts"),
@@ -533,11 +525,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
 	S(IPI_COMPLETION, "completion interrupts"),
 };
 
-static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
-{
-	trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);
-	__smp_cross_call(target, ipinr);
-}
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr);
 
 void show_ipi_list(struct seq_file *p, int prec)
 {
@@ -716,9 +704,10 @@ static irqreturn_t ipi_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void ipi_send(const struct cpumask *target, unsigned int ipi)
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
 {
-	__ipi_send_mask(ipi_desc[ipi], target);
+	trace_ipi_raise_rcuidle(target, ipi_types[ipinr]);
+	__ipi_send_mask(ipi_desc[ipinr], target);
 }
 
 static void ipi_setup(int cpu)
@@ -760,7 +749,6 @@ void __init set_smp_ipi_range(int ipi_base, int n)
 	}
 
 	ipi_irq_base = ipi_base;
-	set_smp_cross_call(ipi_send);
 
 	/* Setup the boot CPU immediately */
 	ipi_setup(smp_processor_id());
@@ -873,7 +861,7 @@ core_initcall(register_cpufreq_notifier);
 
 static void raise_nmi(cpumask_t *mask)
 {
-	__smp_cross_call(mask, IPI_CPU_BACKTRACE);
+	__ipi_send_mask(ipi_desc[IPI_CPU_BACKTRACE], mask);
 }
 
 void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
-- 
2.27.0

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