kmemtrace: remove config option for enabling tracing at boot

Users can pass kmemtrace.enabled=yes as a kernel parameter to enable kmemtrace
at boot so remove the useless CONFIG_KMEMTRACE_DEFAULT_ENABLED config option.

Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

3 files changed, 4 insertions, 14 deletions

diff --git a/Documentation/vm/kmemtrace.txt b/Documentation/vm/kmemtrace.txt
index f656cac3558c..a956d9b7f943 100644
--- a/Documentation/vm/kmemtrace.txt
+++ b/Documentation/vm/kmemtrace.txt
@@ -61,7 +61,7 @@ III. Quick usage guide
 ======================
 
 1) Get a kernel that supports kmemtrace and build it accordingly (i.e. enable
-CONFIG_KMEMTRACE and CONFIG_KMEMTRACE_DEFAULT_ENABLED).
+CONFIG_KMEMTRACE).
 
 2) Get the userspace tool and build it:
 $ git-clone git://repo.or.cz/kmemtrace-user.git         # current repository
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 78d669b461d2..b5417e23ba94 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -823,14 +823,6 @@ config KMEMTRACE
 
           If unsure, say N.
 
-config KMEMTRACE_DEFAULT_ENABLED
-        bool "Enabled by default at boot"
-        depends on KMEMTRACE
-        help
-          Say Y here to enable kmemtrace at boot-time by default. Whatever
-          the choice, the behavior can be overridden by a kernel parameter,
-          as described in documentation.
-
 menuconfig BUILD_DOCSRC
         bool "Build targets in Documentation/ tree"
         depends on HEADERS_CHECK
diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c
index f7a49c077df2..f7704f52c4b1 100644
--- a/mm/kmemtrace.c
+++ b/mm/kmemtrace.c
@@ -19,11 +19,9 @@ static struct rchan *kmemtrace_chan;
 static u32 kmemtrace_buf_overruns;
 
 static unsigned int kmemtrace_n_subbufs;
-#ifdef CONFIG_KMEMTRACE_DEFAULT_ENABLED
-static unsigned int kmemtrace_enabled = 1;
-#else
-static unsigned int kmemtrace_enabled = 0;
-#endif
+
+/* disabled by default */
+static unsigned int kmemtrace_enabled;
 
 /*
  * The sequence number is used for reordering kmemtrace packets