On Thu, 3 Mar 2016 09:53:00 +0530
Pratyush Anand [off-list ref] wrote:

quoted

diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 636ba8b6240b..f66d668ffce9 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c

@@ -190,19 +190,22 @@ static void clear_regs_spsr_ss(struct pt_regs *regs)
 /* EL1 Single Step Handler hooks */
 static LIST_HEAD(step_hook);
 DEFINE_RWLOCK(step_hook_lock);
+static DEFINE_RWLOCK(step_hook_lock);  

I think, this got wrong during backporting, no?
Should have been
-DEFINE_RWLOCK(step_hook_lock);

Crap! Yep you are right. I screwed this up. I'll go fix it. Luckily,
that patch ended there. It didn't affect 3.12 or earlier.

Thanks for catching that.

-- Steve

quoted

+static DEFINE_SPINLOCK(step_hook_lock);  

~Pratyush