linux-kernel - [PATCH v3 17/21] dyndbg: refactor ddebug_read_flags out of ddebug_parse

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Date:   Wed, 17 Jun 2020 10:25:32 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, linux-kernel@...r.kernel.org,
        akpm@...uxfoundation.org, gregkh@...uxfoundation.org
Cc:     linux@...musvillemoes.dk, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH v3 17/21] dyndbg: refactor ddebug_read_flags out of ddebug_parse_flags

Move flag-char reading and validating code to a separate function.

This will allow later reuse to read 2 sets of flags:

  1- flags to set or clear (after the [=-+] Operator)
  2- flags to require or prohibit before changing a callsite's flagstate

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 22335f7dbac1..8400e4f90b67 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -430,6 +430,26 @@ static int ddebug_parse_query(char *words[], int nwords,
 	return 0;
 }
 
+static int ddebug_read_flags(const char *str, struct flag_settings *modifiers)
+{
+	int i;
+
+	for (; *str ; ++str) {
+		for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
+			if (*str == opt_array[i].opt_char) {
+				modifiers->flags |= opt_array[i].flag;
+				break;
+			}
+		}
+		if (i < 0) {
+			pr_err("unknown flag '%c'\n", *str);
+			return -EINVAL;
+		}
+	}
+	vpr_info("flags=0x%x\n", modifiers->flags);
+	return 0;
+}
+
 /*
  * Parse `str' as a flags specification, format [-+=][p]+.
  * Sets up *maskp and *flagsp to be used when changing the
@@ -438,7 +458,7 @@ static int ddebug_parse_query(char *words[], int nwords,
  */
 static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
 {
-	int op, i;
+	int op;
 
 	switch (*str) {
 	case '+':
@@ -452,19 +472,8 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
 	}
 	vpr_info("op='%c'\n", op);
 
-	for (; *str ; ++str) {
-		for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
-			if (*str == opt_array[i].opt_char) {
-				modifiers->flags |= opt_array[i].flag;
-				break;
-			}
-		}
-		if (i < 0) {
-			pr_err("unknown flag '%c'\n", *str);
-			return -EINVAL;
-		}
-	}
-	vpr_info("flags=0x%x\n", modifiers->flags);
+	if (ddebug_read_flags(str, modifiers))
+		return -EINVAL;
 
 	/* calculate final flags, mask based upon op */
 	switch (op) {
-- 
2.26.2