rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT_LEAF

This commit introduces an RCU_FANOUT_LEAF C-preprocessor macro so
that RCU will build even when CONFIG_RCU_FANOUT_LEAF is undefined.
The RCU_FANOUT_LEAF macro is set to the value of CONFIG_RCU_FANOUT_LEAF
when defined, otherwise it is set to 32 for 32-bit systems and 64 for
64-bit systems.  This commit then makes CONFIG_RCU_FANOUT_LEAF depend
on CONFIG_RCU_EXPERT, so that Kconfig users won't be asked about
CONFIG_RCU_FANOUT_LEAF unless they want to be.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>

3 files changed, 18 insertions, 8 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index ba3f8d59d948..1edd11298224 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -119,8 +119,8 @@ module_param(dump_tree, bool, 0444);
 /* Control rcu_node-tree auto-balancing at boot time. */
 static bool rcu_fanout_exact;
 module_param(rcu_fanout_exact, bool, 0444);
-/* Increase (but not decrease) the CONFIG_RCU_FANOUT_LEAF at boot time. */
-static int rcu_fanout_leaf = CONFIG_RCU_FANOUT_LEAF;
+/* Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. */
+static int rcu_fanout_leaf = RCU_FANOUT_LEAF;
 module_param(rcu_fanout_leaf, int, 0444);
 int rcu_num_lvls __read_mostly = RCU_NUM_LVLS;
 static int num_rcu_lvl[] = {  /* Number of rcu_nodes at specified level. */
@@ -4097,7 +4097,7 @@ static void __init rcu_init_geometry(void)
                 jiffies_till_next_fqs = d;
 
         /* If the compile-time values are accurate, just leave. */
-        if (rcu_fanout_leaf == CONFIG_RCU_FANOUT_LEAF &&
+        if (rcu_fanout_leaf == RCU_FANOUT_LEAF &&
             nr_cpu_ids == NR_CPUS)
                 return;
         pr_info("RCU: Adjusting geometry for rcu_fanout_leaf=%d, nr_cpu_ids=%d\n",
@@ -4121,7 +4121,7 @@ static void __init rcu_init_geometry(void)
          * the configured number of CPUs.  Complain and fall back to the
          * compile-time values if these limits are exceeded.
          */
-        if (rcu_fanout_leaf < CONFIG_RCU_FANOUT_LEAF ||
+        if (rcu_fanout_leaf < RCU_FANOUT_LEAF ||
             rcu_fanout_leaf > sizeof(unsigned long) * 8 ||
             n > rcu_capacity[MAX_RCU_LVLS]) {
                 WARN_ON(1);
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index ac3020fff028..7d949c186302 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -48,7 +48,17 @@
 # endif
 #endif /* #else #ifdef CONFIG_RCU_FANOUT */
 
-#define RCU_FANOUT_1          (CONFIG_RCU_FANOUT_LEAF)
+#ifdef CONFIG_RCU_FANOUT_LEAF
+#define RCU_FANOUT_LEAF CONFIG_RCU_FANOUT_LEAF
+#else /* #ifdef CONFIG_RCU_FANOUT_LEAF */
+# ifdef CONFIG_64BIT
+# define RCU_FANOUT_LEAF 64
+# else
+# define RCU_FANOUT_LEAF 32
+# endif
+#endif /* #else #ifdef CONFIG_RCU_FANOUT_LEAF */
+
+#define RCU_FANOUT_1          (RCU_FANOUT_LEAF)
 #define RCU_FANOUT_2          (RCU_FANOUT_1 * RCU_FANOUT)
 #define RCU_FANOUT_3          (RCU_FANOUT_2 * RCU_FANOUT)
 #define RCU_FANOUT_4          (RCU_FANOUT_3 * RCU_FANOUT)
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index d7e505970f24..713503853841 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -76,10 +76,10 @@ static void __init rcu_bootup_announce_oddness(void)
                 pr_info("\tAdditional per-CPU info printed with stalls.\n");
         if (NUM_RCU_LVL_4 != 0)
                 pr_info("\tFour-level hierarchy is enabled.\n");
-        if (CONFIG_RCU_FANOUT_LEAF != 16)
+        if (RCU_FANOUT_LEAF != 16)
                 pr_info("\tBuild-time adjustment of leaf fanout to %d.\n",
-                        CONFIG_RCU_FANOUT_LEAF);
-        if (rcu_fanout_leaf != CONFIG_RCU_FANOUT_LEAF)
+                        RCU_FANOUT_LEAF);
+        if (rcu_fanout_leaf != RCU_FANOUT_LEAF)
                 pr_info("\tBoot-time adjustment of leaf fanout to %d.\n", rcu_fanout_leaf);
         if (nr_cpu_ids != NR_CPUS)
                 pr_info("\tRCU restricting CPUs from NR_CPUS=%d to nr_cpu_ids=%d.\n", NR_CPUS, nr_cpu_ids);