tracing: probeevent: Unify fetch type tables

Unify {k,u}probe_fetch_type_table to probe_fetch_type_table
because the main difference of those type tables (fetcharg
methods) are gone. Now we can consolidate it.

Link: http://lkml.kernel.org/r/152465871274.26224.13999436317830479698.stgit@devboxSigned-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/trace_kprobe.c

@@ -121,30 +121,6 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
 				struct pt_regs *regs);
 
-/* Fetch type information table */
-static const struct fetch_type kprobes_fetch_type_table[] = {
-	/* Special types */
-	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
-					sizeof(u32), 1, "__data_loc char[]"),
-	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
-					string_size, sizeof(u32), 0, "u32"),
-	/* Basic types */
-	ASSIGN_FETCH_TYPE(u8,  u8,  0),
-	ASSIGN_FETCH_TYPE(u16, u16, 0),
-	ASSIGN_FETCH_TYPE(u32, u32, 0),
-	ASSIGN_FETCH_TYPE(u64, u64, 0),
-	ASSIGN_FETCH_TYPE(s8,  u8,  1),
-	ASSIGN_FETCH_TYPE(s16, u16, 1),
-	ASSIGN_FETCH_TYPE(s32, u32, 1),
-	ASSIGN_FETCH_TYPE(s64, u64, 1),
-	ASSIGN_FETCH_TYPE_ALIAS(x8,  u8,  u8,  0),
-	ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0),
-	ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0),
-	ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0),
-
-	ASSIGN_FETCH_TYPE_END
-};
-
 /*
  * Allocate new trace_probe and initialize it (including kprobes).
  */
@@ -720,8 +696,7 @@ static int create_trace_kprobe(int argc, char **argv)
 
 		/* Parse fetch argument */
 		ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg,
-						 is_return, true,
-						 kprobes_fetch_type_table);
+						 is_return, true);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;

kernel/trace/trace_probe.c

@@ -61,8 +61,29 @@ int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s, void *data, void *ent)
 
 const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
 
-static const struct fetch_type *find_fetch_type(const char *type,
-						const struct fetch_type *ftbl)
+/* Fetch type information table */
+static const struct fetch_type probe_fetch_types[] = {
+	/* Special types */
+	__ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1,
+			    "__data_loc char[]"),
+	/* Basic types */
+	ASSIGN_FETCH_TYPE(u8,  u8,  0),
+	ASSIGN_FETCH_TYPE(u16, u16, 0),
+	ASSIGN_FETCH_TYPE(u32, u32, 0),
+	ASSIGN_FETCH_TYPE(u64, u64, 0),
+	ASSIGN_FETCH_TYPE(s8,  u8,  1),
+	ASSIGN_FETCH_TYPE(s16, u16, 1),
+	ASSIGN_FETCH_TYPE(s32, u32, 1),
+	ASSIGN_FETCH_TYPE(s64, u64, 1),
+	ASSIGN_FETCH_TYPE_ALIAS(x8,  u8,  u8,  0),
+	ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0),
+	ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0),
+	ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0),
+
+	ASSIGN_FETCH_TYPE_END
+};
+
+static const struct fetch_type *find_fetch_type(const char *type)
 {
 	int i;
 
@@ -83,21 +104,21 @@ static const struct fetch_type *find_fetch_type(const char *type,
 
 		switch (bs) {
 		case 8:
-			return find_fetch_type("u8", ftbl);
+			return find_fetch_type("u8");
 		case 16:
-			return find_fetch_type("u16", ftbl);
+			return find_fetch_type("u16");
 		case 32:
-			return find_fetch_type("u32", ftbl);
+			return find_fetch_type("u32");
 		case 64:
-			return find_fetch_type("u64", ftbl);
+			return find_fetch_type("u64");
 		default:
 			goto fail;
 		}
 	}
 
-	for (i = 0; ftbl[i].name; i++) {
-		if (strcmp(type, ftbl[i].name) == 0)
-			return &ftbl[i];
+	for (i = 0; probe_fetch_types[i].name; i++) {
+		if (strcmp(type, probe_fetch_types[i].name) == 0)
+			return &probe_fetch_types[i];
 	}
 
 fail:
@@ -164,8 +185,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 static int
 parse_probe_arg(char *arg, const struct fetch_type *type,
 		struct fetch_insn **pcode, struct fetch_insn *end,
-		bool is_return, bool is_kprobe,
-		const struct fetch_type *ftbl)
+		bool is_return, bool is_kprobe)
 {
 	struct fetch_insn *code = *pcode;
 	unsigned long param;
@@ -247,12 +267,11 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
 		tmp = strrchr(arg, ')');
 
 		if (tmp) {
-			const struct fetch_type *t2;
+			const struct fetch_type *t2 = find_fetch_type(NULL);
 
-			t2 = find_fetch_type(NULL, ftbl);
 			*tmp = '\0';
 			ret = parse_probe_arg(arg, t2, &code, end, is_return,
-					      is_kprobe, ftbl);
+					      is_kprobe);
 			if (ret)
 				break;
 			if (code->op == FETCH_OP_COMM)
@@ -312,8 +331,7 @@ static int __parse_bitfield_probe_arg(const char *bf,
 
 /* String length checking wrapper */
 int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
-		struct probe_arg *parg, bool is_return, bool is_kprobe,
-		const struct fetch_type *ftbl)
+		struct probe_arg *parg, bool is_return, bool is_kprobe)
 {
 	struct fetch_insn *code, *tmp = NULL;
 	const char *t;
@@ -339,7 +357,7 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 	 */
 	if (!t && strcmp(arg, "$comm") == 0)
 		t = "string";
-	parg->type = find_fetch_type(t, ftbl);
+	parg->type = find_fetch_type(t);
 	if (!parg->type) {
 		pr_info("Unsupported type: %s\n", t);
 		return -EINVAL;
@@ -353,7 +371,7 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
 	code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
 
 	ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
-			      is_return, is_kprobe, ftbl);
+			      is_return, is_kprobe);
 	if (ret)
 		goto fail;
 

kernel/trace/trace_probe.h

@@ -184,9 +184,6 @@ DECLARE_BASIC_PRINT_TYPE_FUNC(string);
 
 #define ASSIGN_FETCH_TYPE_END {}
 
-#define FETCH_TYPE_STRING      0
-#define FETCH_TYPE_STRSIZE     1
-
 #ifdef CONFIG_KPROBE_EVENTS
 bool trace_kprobe_on_func_entry(struct trace_event_call *call);
 bool trace_kprobe_error_injectable(struct trace_event_call *call);
@@ -261,8 +258,7 @@ find_event_file_link(struct trace_probe *tp, struct trace_event_file *file)
 }
 
 extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
-		   struct probe_arg *parg, bool is_return, bool is_kprobe,
-		   const struct fetch_type *ftbl);
+		   struct probe_arg *parg, bool is_return, bool is_kprobe);
 
 extern int traceprobe_conflict_field_name(const char *name,
 			       struct probe_arg *args, int narg);

kernel/trace/trace_uprobe.c

@@ -161,30 +161,6 @@ static unsigned long translate_user_vaddr(unsigned long file_offset)
 	return base_addr + file_offset;
 }
 
-/* Fetch type information table */
-static const struct fetch_type uprobes_fetch_type_table[] = {
-	/* Special types */
-	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
-					sizeof(u32), 1, "__data_loc char[]"),
-	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
-					string_size, sizeof(u32), 0, "u32"),
-	/* Basic types */
-	ASSIGN_FETCH_TYPE(u8,  u8,  0),
-	ASSIGN_FETCH_TYPE(u16, u16, 0),
-	ASSIGN_FETCH_TYPE(u32, u32, 0),
-	ASSIGN_FETCH_TYPE(u64, u64, 0),
-	ASSIGN_FETCH_TYPE(s8,  u8,  1),
-	ASSIGN_FETCH_TYPE(s16, u16, 1),
-	ASSIGN_FETCH_TYPE(s32, u32, 1),
-	ASSIGN_FETCH_TYPE(s64, u64, 1),
-	ASSIGN_FETCH_TYPE_ALIAS(x8,  u8,  u8,  0),
-	ASSIGN_FETCH_TYPE_ALIAS(x16, u16, u16, 0),
-	ASSIGN_FETCH_TYPE_ALIAS(x32, u32, u32, 0),
-	ASSIGN_FETCH_TYPE_ALIAS(x64, u64, u64, 0),
-
-	ASSIGN_FETCH_TYPE_END
-};
-
 /* Note that we don't verify it, since the code does not come from user space */
 static int
 process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
@@ -621,8 +597,7 @@ static int create_trace_uprobe(int argc, char **argv)
 
 		/* Parse fetch argument */
 		ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
-						 is_return, false,
-						 uprobes_fetch_type_table);
+						 is_return, false);
 		if (ret) {
 			pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
 			goto error;