linux-kernel - [PATCH] tracing: make PREEMPTIRQ

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Message-Id: <20171103104031.270375-1-arnd@arndb.de>
Date:   Fri,  3 Nov 2017 11:39:57 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] tracing: make PREEMPTIRQ_EVENTS depend on TRACING

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 <arnd@...db.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