Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / up.c

diff --git a/kernel/kernel/up.c b/kernel/kernel/up.c
new file mode 100644 (file)
index 0000000..1760bf3
--- /dev/null
+++ b/kernel/kernel/up.c
@@ -0,0 +1,84 @@
+/*
+ * 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>
+
+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);