[RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error

[Peter Zijlstra]

In order to break a header dependency between lockdep and task_struct,
I need per-cpu stuff from lockdep.

Including <asm/percpu.h> from lockdep.h gives a build error, this
patch cures that, but results in the following warning:

../arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable
register unsigned long __local_per_cpu_offset asm("g5");

But i've no idea how to fix that :/ but it does build.

Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 arch/sparc/include/asm/trap_block.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/sparc/include/asm/trap_block.h
+++ b/arch/sparc/include/asm/trap_block.h
@@ -2,6 +2,8 @@
 #ifndef _SPARC_TRAP_BLOCK_H
 #define _SPARC_TRAP_BLOCK_H
 
+#include <linux/threads.h>
+
 #include <asm/hypervisor.h>
 #include <asm/asi.h>