livepatch: Add state describe for force

hulk inclusion
category: feature
bugzilla: 119440 https://gitee.com/openeuler/kernel/issues/I4DDEL

--------------------------------

The force field is divided into three states. KLP_NORMAL_FORCE
indicates that a hot patch is installed according to the initial
rule. KLP_ENFORCMENT indicates that the hot patch of the function
must be installed. KLP_STACK_OPTIMIZE is prepared for stack
optimization policy.
Signed-off-by: NYe Weihua <yeweihua4@huawei.com>
Reviewed-by: NKuohai Xu <xukuohai@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm/kernel/livepatch.c

@@ -99,7 +99,7 @@ static int klp_check_activeness_func(struct stackframe *frame, void *data)
 	for (obj = patch->objs; obj->funcs; obj++) {
 		for (func = obj->funcs; func->old_name; func++) {
 			if (args->enable) {
-				if (func->force)
+				if (func->force == KLP_ENFORCEMENT)
 					continue;
 				/*
 				 * When enable, checking the currently

arch/arm64/kernel/livepatch.c

@@ -104,7 +104,7 @@ static bool klp_check_activeness_func(void *data, unsigned long pc)
 	for (obj = patch->objs; obj->funcs; obj++) {
 		for (func = obj->funcs; func->old_name; func++) {
 			if (args->enable) {
-				if (func->force)
+				if (func->force == KLP_ENFORCEMENT)
 					continue;
 				/*
 				 * When enable, checking the currently

arch/powerpc/kernel/livepatch_32.c

@@ -93,7 +93,7 @@ static int klp_check_activeness_func(struct stackframe *frame, void *data)
 	for (obj = patch->objs; obj->funcs; obj++) {
 		for (func = obj->funcs; func->old_name; func++) {
 			if (args->enable) {
-				if (func->force)
+				if (func->force == KLP_ENFORCEMENT)
 					continue;
 				/*
 				 * When enable, checking the currently

arch/powerpc/kernel/livepatch_64.c

@@ -132,7 +132,7 @@ static int klp_check_activeness_func(struct stackframe *frame, void *data)
 
 			/* Check func address in stack */
 			if (args->enable) {
-				if (func->force)
+				if (func->force == KLP_ENFORCEMENT)
 					continue;
 				/*
 				 * When enable, checking the currently

arch/x86/kernel/livepatch.c

@@ -90,7 +90,7 @@ static int klp_check_stack_func(struct klp_func *func,
 #endif
 
 		if (enable) {
-			if (func->force)
+			if (func->force == KLP_ENFORCEMENT)
 				continue;
 			/*
 			 * When enable, checking the currently active

include/linux/livepatch.h

@@ -23,6 +23,10 @@
 #define KLP_UNPATCHED	 0
 #define KLP_PATCHED	 1
 
+#define KLP_NORMAL_FORCE	0
+#define KLP_ENFORCEMENT		1
+#define KLP_STACK_OPTIMIZE	2
+
 /**
  * struct klp_func - function structure for live patching
  * @old_name:	name of the function to be patched