[PATCH] tracing: make PREEMPTIRQ_EVENTS depend on TRACING

[Arnd Bergmann]

When CONFIG_TRACING is disabled, the new preemptirq events tracer
produces a build failure:

In file included from kernel/trace/trace_irqsoff.c:17:0:
kernel/trace/trace.h: In function 'trace_test_and_set_recursion':
kernel/trace/trace.h:542:28: error: 'struct task_struct' has no member named 
'trace_recursion'

Adding an explicit dependency avoids the broken configuration.

Fixes: d59158162e03 ("tracing: Add support for preempt and irq enable/disable 
events")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
No idea if this is the best solution, it just happened to fix the build
failure for me.
---
 kernel/trace/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 1ff10ca078d6..c8c18c793c86 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -164,6 +164,7 @@ config PREEMPTIRQ_EVENTS
        bool "Enable trace events for preempt and irq disable/enable"
        select TRACE_IRQFLAGS
        depends on DEBUG_PREEMPT || !PROVE_LOCKING
+       depends on TRACING
        default n
        help
          Enable tracing of disable and enable events for preemption and irqs.
-- 
2.9.0