From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:02:30 +0200
Subject: Adding upstream version 4.19.249.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 kernel/up.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 kernel/up.c

(limited to 'kernel/up.c')

diff --git a/kernel/up.c b/kernel/up.c
new file mode 100644
index 000000000..2080f75e0
--- /dev/null
+++ b/kernel/up.c
@@ -0,0 +1,102 @@
+/*
+ * Uniprocessor-only support functions.  The counterpart to kernel/smp.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/smp.h>
+#include <linux/hypervisor.h>
+
+int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
+				int wait)
+{
+	unsigned long flags;
+
+	WARN_ON(cpu != 0);
+
+	local_irq_save(flags);
+	func(info);
+	local_irq_restore(flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(smp_call_function_single);
+
+int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	csd->func(csd->info);
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(smp_call_function_single_async);
+
+int on_each_cpu(smp_call_func_t func, void *info, int wait)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	func(info);
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(on_each_cpu);
+
+/*
+ * Note we still need to test the mask even for UP
+ * because we actually can get an empty mask from
+ * code that on SMP might call us without the local
+ * CPU in the mask.
+ */
+void on_each_cpu_mask(const struct cpumask *mask,
+		      smp_call_func_t func, void *info, bool wait)
+{
+	unsigned long flags;
+
+	if (cpumask_test_cpu(0, mask)) {
+		local_irq_save(flags);
+		func(info);
+		local_irq_restore(flags);
+	}
+}
+EXPORT_SYMBOL(on_each_cpu_mask);
+
+/*
+ * Preemption is disabled here to make sure the cond_func is called under the
+ * same condtions in UP and SMP.
+ */
+void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
+		      smp_call_func_t func, void *info, bool wait,
+		      gfp_t gfp_flags)
+{
+	unsigned long flags;
+
+	preempt_disable();
+	if (cond_func(0, info)) {
+		local_irq_save(flags);
+		func(info);
+		local_irq_restore(flags);
+	}
+	preempt_enable();
+}
+EXPORT_SYMBOL(on_each_cpu_cond);
+
+int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
+{
+	int ret;
+
+	if (cpu != 0)
+		return -ENXIO;
+
+	if (phys)
+		hypervisor_pin_vcpu(0);
+	ret = func(par);
+	if (phys)
+		hypervisor_pin_vcpu(-1);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(smp_call_on_cpu);
-- 
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