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Subject[PATCH] tracing: fix a build error on alpha and m68k
When tracing is enabled, some arch have included <linux/irqflags.h>
on their <asm/system.h> but others like alpha or m68k don't.

Build error on alpha:

kernel/trace/trace.c: In function 'tracing_generic_entry_update':
kernel/trace/trace.c:658: error: implicit declaration of function 'irqs_disabled_flags'
kernel/trace/trace.c: In function 'tracing_cpumask_write':
kernel/trace/trace.c:2145: error: implicit declaration of function 'raw_local_irq_disable'
kernel/trace/trace.c:2162: error: implicit declaration of function 'raw_local_irq_enable'
kernel/trace/trace.c: In function 'trace_die_handler':
kernel/trace/trace.c:3039: error: 'DIE_OOPS' undeclared (first use in this function)

Build error on m68k:
http://kisskb.ellerman.id.au/kisskb/buildresult/50641/


Include it on kernel/trace/trace.c

Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 78d5661..deb9684 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -34,6 +34,7 @@

#include <linux/stacktrace.h>
#include <linux/ring_buffer.h>
+#include <linux/irqflags.h>

#include "trace.h"


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