3 files changed, 39 insertions, 18 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cb45f59685e6..07c28323f88f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -143,6 +143,30 @@ config DEBUG_INFO_REDUCED
           DEBUG_INFO build and compile times are reduced too.
           Only works with newer gcc versions.
 
+config DEBUG_INFO_SPLIT
+        bool "Produce split debuginfo in .dwo files"
+        depends on DEBUG_INFO
+        help
+          Generate debug info into separate .dwo files. This significantly
+          reduces the build directory size for builds with DEBUG_INFO,
+          because it stores the information only once on disk in .dwo
+          files instead of multiple times in object files and executables.
+          In addition the debug information is also compressed.
+
+          Requires recent gcc (4.7+) and recent gdb/binutils.
+          Any tool that packages or reads debug information would need
+          to know about the .dwo files and include them.
+          Incompatible with older versions of ccache.
+
+config DEBUG_INFO_DWARF4
+        bool "Generate dwarf4 debuginfo"
+        depends on DEBUG_INFO
+        help
+          Generate dwarf4 debug info. This requires recent versions
+          of gcc and gdb. It makes the debug information larger.
+          But it significantly improves the success of resolving
+          variables in gdb on optimized code.
+
 config ENABLE_WARN_DEPRECATED
         bool "Enable __deprecated logic"
         default y
diff --git a/lib/lru_cache.c b/lib/lru_cache.c
index 4a83ecd03650..852c81e3ba9a 100644
--- a/lib/lru_cache.c
+++ b/lib/lru_cache.c
@@ -169,7 +169,7 @@ out_fail:
         return NULL;
 }
 
-void lc_free_by_index(struct lru_cache *lc, unsigned i)
+static void lc_free_by_index(struct lru_cache *lc, unsigned i)
 {
         void *p = lc->lc_element[i];
         WARN_ON(!p);
@@ -643,9 +643,10 @@ void lc_set(struct lru_cache *lc, unsigned int enr, int index)
  * lc_dump - Dump a complete LRU cache to seq in textual form.
  * @lc: the lru cache to operate on
  * @seq: the &struct seq_file pointer to seq_printf into
- * @utext: user supplied "heading" or other info
+ * @utext: user supplied additional "heading" or other info
  * @detail: function pointer the user may provide to dump further details
- * of the object the lc_element is embedded in.
+ * of the object the lc_element is embedded in. May be NULL.
+ * Note: a leading space ' ' and trailing newline '\n' is implied.
  */
 void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char *utext,
              void (*detail) (struct seq_file *, struct lc_element *))
@@ -654,16 +655,18 @@ void lc_seq_dump_details(struct seq_file *seq, struct lru_cache *lc, char *utext
         struct lc_element *e;
         int i;
 
-        seq_printf(seq, "\tnn: lc_number refcnt %s\n ", utext);
+        seq_printf(seq, "\tnn: lc_number (new nr) refcnt %s\n ", utext);
         for (i = 0; i < nr_elements; i++) {
                 e = lc_element_by_index(lc, i);
-                if (e->lc_number == LC_FREE) {
-                        seq_printf(seq, "\t%2d: FREE\n", i);
-                } else {
-                        seq_printf(seq, "\t%2d: %4u %4u    ", i,
-                                   e->lc_number, e->refcnt);
+                if (e->lc_number != e->lc_new_number)
+                        seq_printf(seq, "\t%5d: %6d %8d %6d ",
+                                i, e->lc_number, e->lc_new_number, e->refcnt);
+                else
+                        seq_printf(seq, "\t%5d: %6d %-8s %6d ",
+                                i, e->lc_number, "-\"-", e->refcnt);
+                if (detail)
                         detail(seq, e);
-                }
+                seq_putc(seq, '\n');
         }
 }
 
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index e6940cf16628..a2c78810ebc1 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -38,16 +38,10 @@ int lockdep_rht_mutex_is_held(const struct rhashtable *ht)
 EXPORT_SYMBOL_GPL(lockdep_rht_mutex_is_held);
 #endif
 
-/**
- * rht_obj - cast hash head to outer object
- * @ht:         hash table
- * @he:         hashed node
- */
-void *rht_obj(const struct rhashtable *ht, const struct rhash_head *he)
+static void *rht_obj(const struct rhashtable *ht, const struct rhash_head *he)
 {
         return (void *) he - ht->p.head_offset;
 }
-EXPORT_SYMBOL_GPL(rht_obj);
 
 static u32 __hashfn(const struct rhashtable *ht, const void *key,
                       u32 len, u32 hsize)
@@ -386,7 +380,7 @@ EXPORT_SYMBOL_GPL(rhashtable_insert);
  * deletion when combined with walking or lookup.
  */
 void rhashtable_remove_pprev(struct rhashtable *ht, struct rhash_head *obj,
-                             struct rhash_head **pprev, gfp_t flags)
+                             struct rhash_head __rcu **pprev, gfp_t flags)
 {
         struct bucket_table *tbl = rht_dereference(ht->tbl, ht);