module: Move latched RB-tree support to a separate file

No functional change.

This patch migrates module latched RB-tree support
(e.g. see __module_address()) from core module code
into kernel/module/tree_lookup.c.

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

1 files changed, 4 insertions, 126 deletions

diff --git a/kernel/module/main.c b/kernel/module/main.c
index 915143827069..0d0fdd82359b 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -90,138 +90,16 @@ static DECLARE_WORK(init_free_wq, do_free_init);
 static LLIST_HEAD(init_free_list);
 
 #ifdef CONFIG_MODULES_TREE_LOOKUP
-
-/*
- * Use a latched RB-tree for __module_address(); this allows us to use
- * RCU-sched lookups of the address from any context.
- *
- * This is conditional on PERF_EVENTS || TRACING because those can really hit
- * __module_address() hard by doing a lot of stack unwinding; potentially from
- * NMI context.
- */
-
-static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n)
-{
-	struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
-
-	return (unsigned long)layout->base;
-}
-
-static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n)
-{
-	struct module_layout *layout = container_of(n, struct module_layout, mtn.node);
-
-	return (unsigned long)layout->size;
-}
-
-static __always_inline bool
-mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b)
-{
-	return __mod_tree_val(a) < __mod_tree_val(b);
-}
-
-static __always_inline int
-mod_tree_comp(void *key, struct latch_tree_node *n)
-{
-	unsigned long val = (unsigned long)key;
-	unsigned long start, end;
-
-	start = __mod_tree_val(n);
-	if (val < start)
-		return -1;
-
-	end = start + __mod_tree_size(n);
-	if (val >= end)
-		return 1;
-
-	return 0;
-}
-
-static const struct latch_tree_ops mod_tree_ops = {
-	.less = mod_tree_less,
-	.comp = mod_tree_comp,
-};
-
-static struct mod_tree_root {
-	struct latch_tree_root root;
-	unsigned long addr_min;
-	unsigned long addr_max;
-} mod_tree __cacheline_aligned = {
+struct mod_tree_root mod_tree __cacheline_aligned = {
 	.addr_min = -1UL,
 };
 
 #define module_addr_min mod_tree.addr_min
 #define module_addr_max mod_tree.addr_max
 
-static noinline void __mod_tree_insert(struct mod_tree_node *node)
-{
-	latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops);
-}
-
-static void __mod_tree_remove(struct mod_tree_node *node)
-{
-	latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops);
-}
-
-/*
- * These modifications: insert, remove_init and remove; are serialized by the
- * module_mutex.
- */
-static void mod_tree_insert(struct module *mod)
-{
-	mod->core_layout.mtn.mod = mod;
-	mod->init_layout.mtn.mod = mod;
-
-	__mod_tree_insert(&mod->core_layout.mtn);
-	if (mod->init_layout.size)
-		__mod_tree_insert(&mod->init_layout.mtn);
-}
-
-static void mod_tree_remove_init(struct module *mod)
-{
-	if (mod->init_layout.size)
-		__mod_tree_remove(&mod->init_layout.mtn);
-}
-
-static void mod_tree_remove(struct module *mod)
-{
-	__mod_tree_remove(&mod->core_layout.mtn);
-	mod_tree_remove_init(mod);
-}
-
-static struct module *mod_find(unsigned long addr)
-{
-	struct latch_tree_node *ltn;
-
-	ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops);
-	if (!ltn)
-		return NULL;
-
-	return container_of(ltn, struct mod_tree_node, node)->mod;
-}
-
-#else /* MODULES_TREE_LOOKUP */
-
-static unsigned long module_addr_min = -1UL, module_addr_max = 0;
-
-static void mod_tree_insert(struct module *mod) { }
-static void mod_tree_remove_init(struct module *mod) { }
-static void mod_tree_remove(struct module *mod) { }
-
-static struct module *mod_find(unsigned long addr)
-{
-	struct module *mod;
-
-	list_for_each_entry_rcu(mod, &modules, list,
-				lockdep_is_held(&module_mutex)) {
-		if (within_module(addr, mod))
-			return mod;
-	}
-
-	return NULL;
-}
-
-#endif /* MODULES_TREE_LOOKUP */
+#else /* !CONFIG_MODULES_TREE_LOOKUP */
+static unsigned long module_addr_min = -1UL, module_addr_max;
+#endif /* CONFIG_MODULES_TREE_LOOKUP */
 
 /*
  * Bounds of module text, for speeding up __module_address.