2 files changed, 13 insertions, 23 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4c9ae6085c75..29044f500269 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -570,6 +570,15 @@ config DEBUG_NOTIFIERS
           This is a relatively cheap check but if you care about maximum
           performance, say N.
 
+#
+# Select this config option from the architecture Kconfig, if it
+# it is preferred to always offer frame pointers as a config
+# option on the architecture (regardless of KERNEL_DEBUG):
+#
+config ARCH_WANT_FRAME_POINTERS
+        bool
+        help
+
 config FRAME_POINTER
         bool "Compile the kernel with frame pointers"
         depends on DEBUG_KERNEL && \
@@ -633,19 +642,6 @@ config RCU_TORTURE_TEST_RUNNABLE
 
 config RCU_CPU_STALL_DETECTOR
         bool "Check for stalled CPUs delaying RCU grace periods"
-        depends on CLASSIC_RCU
-        default n
-        help
-          This option causes RCU to printk information on which
-          CPUs are delaying the current grace period, but only when
-          the grace period extends for excessive time periods.
-
-          Say Y if you want RCU to perform such checks.
-
-          Say N if you are unsure.
-
-config RCU_CPU_STALL_DETECTOR
-        bool "Check for stalled CPUs delaying RCU grace periods"
         depends on CLASSIC_RCU || TREE_RCU
         default n
         help
diff --git a/lib/idr.c b/lib/idr.c
index 1c4f9281f412..c11c5765cdef 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -121,7 +121,7 @@ int idr_pre_get(struct idr *idp, gfp_t gfp_mask)
 {
         while (idp->id_free_cnt < IDR_FREE_MAX) {
                 struct idr_layer *new;
-                new = kmem_cache_alloc(idr_layer_cache, gfp_mask);
+                new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
                 if (new == NULL)
                         return (0);
                 move_to_free_list(idp, new);
@@ -292,7 +292,7 @@ static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id)
  * and go back to the idr_pre_get() call.  If the idr is full, it will
  * return -ENOSPC.
  *
- * @id returns a value in the range 0 ... 0x7fffffff
+ * @id returns a value in the range @starting_id ... 0x7fffffff
  */
 int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id)
 {
@@ -623,16 +623,10 @@ void *idr_replace(struct idr *idp, void *ptr, int id)
 }
 EXPORT_SYMBOL(idr_replace);
 
-static void idr_cache_ctor(void *idr_layer)
-{
-        memset(idr_layer, 0, sizeof(struct idr_layer));
-}
-
 void __init idr_init_cache(void)
 {
         idr_layer_cache = kmem_cache_create("idr_layer_cache",
-                                sizeof(struct idr_layer), 0, SLAB_PANIC,
-                                idr_cache_ctor);
+                                sizeof(struct idr_layer), 0, SLAB_PANIC, NULL);
 }
 
 /**
@@ -723,7 +717,7 @@ EXPORT_SYMBOL(ida_pre_get);
  * and go back to the ida_pre_get() call.  If the ida is full, it will
  * return -ENOSPC.
  *
- * @p_id returns a value in the range 0 ... 0x7fffffff.
+ * @p_id returns a value in the range @starting_id ... 0x7fffffff.
  */
 int ida_get_new_above(struct ida *ida, int starting_id, int *p_id)
 {