[PATCH] tracing/timerlat: move interface_lock definition up

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

The definition was previously moved into an #ifdef block by
accident and now causes a build failure when CONFIG_TIMERLAT_TRACER
is disabled:

In file included from include/linux/seqlock.h:19,
                 from kernel/trace/trace_osnoise.c:20:
kernel/trace/trace_osnoise.c: In function 'osnoise_sleep':
kernel/trace/trace_osnoise.c:1631:21: error: 'interface_lock' undeclared (first use in this function); did you mean 'trace_clock'?
 1631 |         mutex_lock(&interface_lock);
      |                     ^~~~~~~~~~~~~~

Move it up some more to be outside of that #ifdef again.

Fixes: e6a53481da29 ("tracing/timerlat: Only clear timer if a kthread exists")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
It looks like the regression already made it into 6.11-rc7 as
part of
https://lore.kernel.org/lkml/20240905172827.6a64cf97@xxxxxxxxxxxxxxxxxx/
so this fixup (if correct) is needed for 6.11 as well
---
 kernel/trace/trace_osnoise.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 20c6660762a3..acfd57689af6 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -228,6 +228,11 @@ static inline struct osnoise_variables *this_cpu_osn_var(void)
 	return this_cpu_ptr(&per_cpu_osnoise_var);
 }
 
+/*
+ * Protect the interface.
+ */
+static struct mutex interface_lock;
+
 #ifdef CONFIG_TIMERLAT_TRACER
 /*
  * Runtime information for the timer mode.
@@ -252,11 +257,6 @@ static inline struct timerlat_variables *this_cpu_tmr_var(void)
 	return this_cpu_ptr(&per_cpu_timerlat_var);
 }
 
-/*
- * Protect the interface.
- */
-static struct mutex interface_lock;
-
 /*
  * tlat_var_reset - Reset the values of the given timerlat_variables
  */
-- 
2.39.2