[Xen-devel] [PATCH v3 12/15] x86/IRQ: add explicit tracing-enabled check to trace_irq_mask()

["Jan Beulich" <JBeulich@xxxxxxxx>]

The setup for calling trace_var() (which itself checks tb_init_done) is
non-negligible, and hence a separate outer-most check is warranted.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v3: New.

--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -121,8 +121,8 @@ static void release_old_vec(struct irq_d
     }
 }
 
-static void trace_irq_mask(uint32_t event, int irq, int vector,
-                           const cpumask_t *mask)
+static void _trace_irq_mask(uint32_t event, int irq, int vector,
+                            const cpumask_t *mask)
 {
     struct {
         unsigned int irq:16, vec:16;
@@ -137,6 +137,13 @@ static void trace_irq_mask(uint32_t even
     trace_var(event, 1, sizeof(d), &d);
 }
 
+static inline void trace_irq_mask(uint32_t event, int irq, int vector,
+                                  const cpumask_t *mask)
+{
+    if ( unlikely(tb_init_done) )
+        _trace_irq_mask(event, irq, vector, mask);
+}
+
 static int __init _bind_irq_vector(struct irq_desc *desc, int vector,
                                    const cpumask_t *cpu_mask)
 {





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