[PATCH 02/12] locking/rtmutex: Move max_lock_depth into rtmutex.c

[Joel Granados]

Move the max_lock_depth sysctl table element and variable into
rtmutex.c. Make the variable static as it no longer needs to be
exported. Removed the rtmutex.h include from sysctl.c.

This is part of a greater effort to move ctl tables into their
respective subsystems which will reduce the merge conflicts in
kernel/sysctl.c.

Signed-off-by: Joel Granados <joel.grana...@kernel.org>
---
 include/linux/rtmutex.h      |  2 --
 kernel/locking/rtmutex.c     | 23 +++++++++++++++++++++++
 kernel/locking/rtmutex_api.c |  5 -----
 kernel/sysctl.c              | 12 ------------
 4 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index 
7d049883a08ace049384d70b4c97e3f4fb0e46f8..dc9a51cda97cdb6ac8e12be5209071744101b703
 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -18,8 +18,6 @@
 #include <linux/rbtree_types.h>
 #include <linux/spinlock_types_raw.h>
 
-extern int max_lock_depth; /* for sysctl */
-
 struct rt_mutex_base {
        raw_spinlock_t          wait_lock;
        struct rb_root_cached   waiters;
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 
c80902eacd797c669dedcf10966a8cff38524b50..705a0e0fd72ab8da051e4227a5b89cb3d1539524
 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -29,6 +29,29 @@
 #include "rtmutex_common.h"
 #include "lock_events.h"
 
+/*
+ * Max number of times we'll walk the boosting chain:
+ */
+static int max_lock_depth = 1024;
+
+static const struct ctl_table rtmutex_sysctl_table[] = {
+       {
+               .procname       = "max_lock_depth",
+               .data           = &max_lock_depth,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec,
+       },
+};
+
+static int __init init_rtmutex_sysctl(void)
+{
+       register_sysctl_init("kernel", rtmutex_sysctl_table);
+       return 0;
+}
+
+subsys_initcall(init_rtmutex_sysctl);
+
 #ifndef WW_RT
 # define build_ww_mutex()      (false)
 # define ww_container_of(rtm)  NULL
diff --git a/kernel/locking/rtmutex_api.c b/kernel/locking/rtmutex_api.c
index 
191e4720e546627aed0d7ec715673b1b8753b130..2b5da8af206da6ee72df1234a4db94f5c4f6f882
 100644
--- a/kernel/locking/rtmutex_api.c
+++ b/kernel/locking/rtmutex_api.c
@@ -8,11 +8,6 @@
 #define RT_MUTEX_BUILD_MUTEX
 #include "rtmutex.c"
 
-/*
- * Max number of times we'll walk the boosting chain:
- */
-int max_lock_depth = 1024;
-
 /*
  * Debug aware fast / slowpath lock,trylock,unlock
  *
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 
473133d9651eac4ef44b8b63a44b77189818ac08..a22f35013da0d838ef421fc5d192f00d1e70fb0f
 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -59,9 +59,6 @@
 #include <asm/nmi.h>
 #include <asm/io.h>
 #endif
-#ifdef CONFIG_RT_MUTEXES
-#include <linux/rtmutex.h>
-#endif
 
 /* shared constants to be used in various sysctls */
 const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 
65535, -1 };
@@ -1709,15 +1706,6 @@ static const struct ctl_table kern_table[] = {
                .proc_handler   = proc_dointvec,
        },
 #endif
-#ifdef CONFIG_RT_MUTEXES
-       {
-               .procname       = "max_lock_depth",
-               .data           = &max_lock_depth,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec,
-       },
-#endif
 #ifdef CONFIG_TREE_RCU
        {
                .procname       = "panic_on_rcu_stall",

-- 
2.47.2