linux-kernel - [PATCH v6 2/6] module: Prepare for handling several RB trees

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Message-Id: <8788e5b6180ad45ec933359bc97c1c8fe865f186.1645607143.git.christophe.leroy@csgroup.eu>
Date:   Wed, 23 Feb 2022 13:02:12 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Aaron Tomlin <atomlin@...hat.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kgdb-bugreport@...ts.sourceforge.net, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-modules@...r.kernel.org
Subject: [PATCH v6 2/6] module: Prepare for handling several RB trees

In order to separate text and data, we need to setup
two rb trees.

Modify functions to give the tree as a parameter.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 kernel/module/internal.h    |  4 ++--
 kernel/module/main.c        | 16 ++++++++--------
 kernel/module/tree_lookup.c | 20 ++++++++++----------
 3 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index ac64e53ac5e3..0f3146347256 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -157,13 +157,13 @@ extern struct mod_tree_root mod_tree;
 void mod_tree_insert(struct module *mod);
 void mod_tree_remove_init(struct module *mod);
 void mod_tree_remove(struct module *mod);
-struct module *mod_find(unsigned long addr);
+struct module *mod_find(unsigned long addr, struct mod_tree_root *tree);
 #else /* !CONFIG_MODULES_TREE_LOOKUP */
 
 static inline void mod_tree_insert(struct module *mod) { }
 static inline void mod_tree_remove_init(struct module *mod) { }
 static inline void mod_tree_remove(struct module *mod) { }
-static inline struct module *mod_find(unsigned long addr)
+static inline struct module *mod_find(unsigned long addr, struct mod_tree_root *tree)
 {
 	struct module *mod;
 
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 3832a71cdacb..a831f51595d7 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -91,22 +91,22 @@ struct symsearch {
  * Bounds of module text, for speeding up __module_address.
  * Protected by module_mutex.
  */
-static void __mod_update_bounds(void *base, unsigned int size)
+static void __mod_update_bounds(void *base, unsigned int size, struct mod_tree_root *tree)
 {
 	unsigned long min = (unsigned long)base;
 	unsigned long max = min + size;
 
-	if (min < module_addr_min)
-		module_addr_min = min;
-	if (max > module_addr_max)
-		module_addr_max = max;
+	if (min < tree->addr_min)
+		tree->addr_min = min;
+	if (max > tree->addr_max)
+		tree->addr_max = max;
 }
 
 static void mod_update_bounds(struct module *mod)
 {
-	__mod_update_bounds(mod->core_layout.base, mod->core_layout.size);
+	__mod_update_bounds(mod->core_layout.base, mod->core_layout.size, &mod_tree);
 	if (mod->init_layout.size)
-		__mod_update_bounds(mod->init_layout.base, mod->init_layout.size);
+		__mod_update_bounds(mod->init_layout.base, mod->init_layout.size, &mod_tree);
 }
 
 static void module_assert_mutex_or_preempt(void)
@@ -3017,7 +3017,7 @@ struct module *__module_address(unsigned long addr)
 
 	module_assert_mutex_or_preempt();
 
-	mod = mod_find(addr);
+	mod = mod_find(addr, &mod_tree);
 	if (mod) {
 		BUG_ON(!within_module(addr, mod));
 		if (mod->state == MODULE_STATE_UNFORMED)
diff --git a/kernel/module/tree_lookup.c b/kernel/module/tree_lookup.c
index 0bc4ec3b22ce..995fe68059db 100644
--- a/kernel/module/tree_lookup.c
+++ b/kernel/module/tree_lookup.c
@@ -61,14 +61,14 @@ static const struct latch_tree_ops mod_tree_ops = {
 	.comp = mod_tree_comp,
 };
 
-static noinline void __mod_tree_insert(struct mod_tree_node *node)
+static noinline void __mod_tree_insert(struct mod_tree_node *node, struct mod_tree_root *tree)
 {
-	latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops);
+	latch_tree_insert(&node->node, &tree->root, &mod_tree_ops);
 }
 
-static void __mod_tree_remove(struct mod_tree_node *node)
+static void __mod_tree_remove(struct mod_tree_node *node, struct mod_tree_root *tree)
 {
-	latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops);
+	latch_tree_erase(&node->node, &tree->root, &mod_tree_ops);
 }
 
 /*
@@ -80,28 +80,28 @@ 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);
+	__mod_tree_insert(&mod->core_layout.mtn, &mod_tree);
 	if (mod->init_layout.size)
-		__mod_tree_insert(&mod->init_layout.mtn);
+		__mod_tree_insert(&mod->init_layout.mtn, &mod_tree);
 }
 
 void mod_tree_remove_init(struct module *mod)
 {
 	if (mod->init_layout.size)
-		__mod_tree_remove(&mod->init_layout.mtn);
+		__mod_tree_remove(&mod->init_layout.mtn, &mod_tree);
 }
 
 void mod_tree_remove(struct module *mod)
 {
-	__mod_tree_remove(&mod->core_layout.mtn);
+	__mod_tree_remove(&mod->core_layout.mtn, &mod_tree);
 	mod_tree_remove_init(mod);
 }
 
-struct module *mod_find(unsigned long addr)
+struct module *mod_find(unsigned long addr, struct mod_tree_root *tree)
 {
 	struct latch_tree_node *ltn;
 
-	ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops);
+	ltn = latch_tree_find((void *)addr, &tree->root, &mod_tree_ops);
 	if (!ltn)
 		return NULL;
 
-- 
2.34.1