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@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index fe45f2f..31db7a0 100644 (file)
--- 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 e997782..c38398e 100644 (file)
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -422,7 +422,7 @@ 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);
 
@@ -440,7 +440,7 @@ 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);
@@ -463,7 +463,7 @@ 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);
        }
@@ -523,7 +523,7 @@ 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;
 
@@ -689,7 +689,7 @@ 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;
 }
 
@@ -738,7 +738,7 @@ 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;
@@ -767,7 +767,7 @@ 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;
@@ -804,7 +804,7 @@ 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;
@@ -961,7 +961,7 @@ 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;