linux-kernel - [PATCH 2/2] livepatch: introduce patch/func-walking helpers

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Date:	Tue, 19 May 2015 12:01:19 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	live-patching@...r.kernel.org
Cc:	jpoimboe@...hat.com, sjenning@...hat.com, jkosina@...e.cz,
	vojtech@...e.cz, linux-kernel@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 2/2] livepatch: introduce patch/func-walking helpers

klp_for_each_object and klp_for_each_func are now used all over the
code. One need not think what is the proper condition to check in the
for loop now.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/linux/livepatch.h |  6 ++++++
 kernel/livepatch/core.c   | 18 +++++++++---------
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index fe45f2f02c8d..31db7a05dd36 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -123,6 +123,12 @@ struct klp_patch {
 	enum klp_state state;
 };
 
+#define klp_for_each_object(patch, obj) \
+	for (obj = patch->objs; obj->funcs; obj++)
+
+#define klp_for_each_func(obj, func) \
+	for (func = obj->funcs; func->old_name; func++)
+
 int klp_register_patch(struct klp_patch *);
 int klp_unregister_patch(struct klp_patch *);
 int klp_enable_patch(struct klp_patch *);
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index e42654d72eba..a545541dcbab 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -423,7 +423,7 @@ static void klp_disable_object(struct klp_object *obj)
 {
 	struct klp_func *func;
 
-	for (func = obj->funcs; func->old_name; func++)
+	klp_for_each_func(obj, func)
 		if (func->state == KLP_ENABLED)
 			klp_disable_func(func);
 
@@ -441,7 +441,7 @@ static int klp_enable_object(struct klp_object *obj)
 	if (WARN_ON(!klp_is_object_loaded(obj)))
 		return -EINVAL;
 
-	for (func = obj->funcs; func->old_name; func++) {
+	klp_for_each_func(obj, func) {
 		ret = klp_enable_func(func);
 		if (ret) {
 			klp_disable_object(obj);
@@ -464,7 +464,7 @@ static int __klp_disable_patch(struct klp_patch *patch)
 
 	pr_notice("disabling patch '%s'\n", patch->mod->name);
 
-	for (obj = patch->objs; obj->funcs; obj++) {
+	klp_for_each_object(patch, obj) {
 		if (obj->state == KLP_ENABLED)
 			klp_disable_object(obj);
 	}
@@ -524,7 +524,7 @@ static int __klp_enable_patch(struct klp_patch *patch)
 
 	pr_notice("enabling patch '%s'\n", patch->mod->name);
 
-	for (obj = patch->objs; obj->funcs; obj++) {
+	klp_for_each_object(patch, obj) {
 		if (!klp_is_object_loaded(obj))
 			continue;
 
@@ -690,7 +690,7 @@ static void klp_free_object_loaded(struct klp_object *obj)
 
 	obj->mod = NULL;
 
-	for (func = obj->funcs; func->old_name; func++)
+	klp_for_each_func(obj, func)
 		func->old_addr = 0;
 }
 
@@ -739,7 +739,7 @@ static int klp_init_object_loaded(struct klp_patch *patch,
 			return ret;
 	}
 
-	for (func = obj->funcs; func->old_name; func++) {
+	klp_for_each_func(obj, func) {
 		ret = klp_find_verify_func_addr(obj, func);
 		if (ret)
 			return ret;
@@ -768,7 +768,7 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
 	if (ret)
 		return ret;
 
-	for (func = obj->funcs; func->old_name; func++) {
+	klp_for_each_func(obj, func) {
 		ret = klp_init_func(obj, func);
 		if (ret)
 			goto free;
@@ -805,7 +805,7 @@ static int klp_init_patch(struct klp_patch *patch)
 	if (ret)
 		goto unlock;
 
-	for (obj = patch->objs; obj->funcs; obj++) {
+	klp_for_each_object(patch, obj) {
 		ret = klp_init_object(patch, obj);
 		if (ret)
 			goto free;
@@ -960,7 +960,7 @@ static int klp_module_notify(struct notifier_block *nb, unsigned long action,
 		mod->klp_alive = false;
 
 	list_for_each_entry(patch, &klp_patches, list) {
-		for (obj = patch->objs; obj->funcs; obj++) {
+		klp_for_each_object(patch, obj) {
 			if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
 				continue;
 
-- 
2.4.1

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