[PATCH v8 33/43] dyndbg: control-parser: treat comma as a token separator

[Jim Cromie via B4 Relay]

From: Jim Cromie <jim.cromie@xxxxxxxxx>

Treat comma as a token terminator, just like a space. This allows a
user to avoid quoting hassles when spaces are otherwise needed:

 :#> modprobe drm dyndbg=class,DRM_UT_CORE,+p\;class,DRM_UT_KMS,+p

Add corresponding Strategy 2 control-file fingerprinting checks to
verify the exact control-file state of kernel/params callsites after
commas-as-spaces, ignored-commas, and quoted-commas queries.

Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
---
 Documentation/admin-guide/dynamic-debug-howto.rst       |  4 +++-
 lib/dynamic_debug.c                                     | 17 +++++++++++++----
 .../testing/selftests/dynamic_debug/dyndbg_selftest.sh  |  4 ++--
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 99bbae37d34e..fe86a9997ab5 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -78,11 +78,12 @@ Command Language Reference
 ==========================
 
 At the basic lexical level, a command is a sequence of words separated
-by spaces or tabs.  So these are all equivalent::
+by spaces, tabs, or commas.  So these are all equivalent::
 
   :#> ddcmd file svcsock.c line 1603 +p
   :#> ddcmd "file svcsock.c line 1603 +p"
   :#> ddcmd '  file   svcsock.c     line  1603 +p  '
+  :#> ddcmd file,svcsock.c,line,1603,+p
 
 Command submissions are bounded by a write() system call.
 Multiple commands can be written together, separated by ``;`` or ``\n``::
@@ -176,6 +177,7 @@ module
 	module */main	   # any subsystem ending in main
         module main	   # simple modname, selects same as above
 	module drm*	   # both drm, drm_kms_helper
+	module,sunrpc	   # with ',' as token separator
 
 format
     The given string is searched for in the dynamic debug format
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 3f9821f747d8..6f700de9738c 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -322,6 +322,14 @@ static int ddebug_change(const struct ddebug_query *query, struct flag_settings
 	return nfound;
 }
 
+static char *skip_spaces_and_commas(const char *str)
+{
+	str = skip_spaces(str);
+	while (*str == ',')
+		str = skip_spaces(++str);
+	return (char *)str;
+}
+
 /*
  * Split the buffer `buf' into space-separated words.
  * Handles simple " and ' quoting, i.e. without nested,
@@ -335,8 +343,8 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 	while (*buf) {
 		char *end;
 
-		/* Skip leading whitespace */
-		buf = skip_spaces(buf);
+		/* Skip leading whitespace and comma */
+		buf = skip_spaces_and_commas(buf);
 		if (!*buf)
 			break;	/* oh, it was trailing whitespace */
 		if (*buf == '#')
@@ -352,7 +360,7 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
 				return -EINVAL;	/* unclosed quote */
 			}
 		} else {
-			for (end = buf; *end && !isspace(*end); end++)
+			for (end = buf; *end && !isspace(*end) && *end != ','; end++)
 				;
 			if (end == buf) {
 				pr_err("parse err after word:%d=%s\n", nwords,
@@ -627,7 +635,8 @@ static int ddebug_exec_queries(char *query, const char *modname)
 		if (split)
 			*split++ = '\0';
 
-		query = skip_spaces(query);
+		query = skip_spaces_and_commas(query);
+
 		if (!query || !*query || *query == '#')
 			continue;
 
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index 2018031f58b9..a9389a98de8b 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -649,8 +649,8 @@ function GOLDEN_RECORDS {
 #K= bede904b02278e5648bb7a8243be8d98 FT_path_module_queries.2
 #K= 4b902c159d7f08f91377bf0a353e0051 FT_path_module_queries.3
 #K= bede904b02278e5648bb7a8243be8d98 FT_path_module_queries.4
-#K= 5d38e4cca64da64a4d7f433398668836 FT_test_classes.1
-#K= 5516e3d13cba7ea4197a7fb6c033887a FT_test_classes.2
+#K= d4923595eea382923aee64aed15c7c35 FT_test_classes.1
+#K= a15ec4843acd721fbdfddc0b512c8032 FT_test_classes.2
 #K= 40a294034c886787960f4c751b196da9 FT_test_classes.3
 #K= 38e813e9025107ac3e24226b8d487a92 FT_classmap_inheritance.1
 #K= 9b82b12a35ad98ef26183db15071f70e FT_classmap_inheritance.2

-- 
2.55.0