ARM: place C irq handlers in IRQ_ENTRY for ftrace

When FUNCTION_GRAPH_TRACER is enabled, place do_IRQ() and friends in the
IRQ_ENTRY section so that the irq-related features of the function graph
tracer work.

Signed-off-by: Rabin Vincent <rabin@rab.in>

1 files changed, 21 insertions, 2 deletions

diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h
index 491960bf426..124475afb00 100644
--- a/arch/arm/include/asm/traps.h
+++ b/arch/arm/include/asm/traps.h
@@ -15,13 +15,32 @@ struct undef_hook {
 void register_undef_hook(struct undef_hook *hook);
 void unregister_undef_hook(struct undef_hook *hook);
 
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static inline int __in_irqentry_text(unsigned long ptr)
+{
+        extern char __irqentry_text_start[];
+        extern char __irqentry_text_end[];
+
+        return ptr >= (unsigned long)&__irqentry_text_start &&
+               ptr < (unsigned long)&__irqentry_text_end;
+}
+#else
+static inline int __in_irqentry_text(unsigned long ptr)
+{
+        return 0;
+}
+#endif
+
 static inline int in_exception_text(unsigned long ptr)
 {
         extern char __exception_text_start[];
         extern char __exception_text_end[];
+        int in;
+
+        in = ptr >= (unsigned long)&__exception_text_start &&
+             ptr < (unsigned long)&__exception_text_end;
 
-        return ptr >= (unsigned long)&__exception_text_start &&
-               ptr < (unsigned long)&__exception_text_end;
+        return in ? : __in_irqentry_text(ptr);
 }
 
 extern void __init early_trap_init(void);