linux-kernel - [PATCH 30/63] dyndbg: treat comma as a token separator

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Message-ID: <20250125064619.8305-31-jim.cromie@gmail.com>
Date: Fri, 24 Jan 2025 23:45:44 -0700
From: Jim Cromie <jim.cromie@...il.com>
To: linux-kernel@...r.kernel.org,
	jbaron@...mai.com,
	gregkh@...uxfoundation.org,
	ukaszb@...omium.org
Cc: intel-gfx-trybot@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	amd-gfx@...ts.freedesktop.org,
	intel-gvt-dev@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	daniel.vetter@...ll.ch,
	tvrtko.ursulin@...ux.intel.com,
	jani.nikula@...el.com,
	ville.syrjala@...ux.intel.com,
	Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 30/63] dyndbg: treat comma as a token separator

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

or as a boot arg:

 drm.dyndbg=class,DRM_UT_CORE,+p  # todo: support multi-query here

Given the many ways a boot-line +args can be assembled and then passed
in/down/around shell based tools, this may allow side-stepping all
sorts of quoting hassles thru those layers.

existing query format:

 modprobe test_dynamic_debug dyndbg="class D2_CORE +p"

new format:

 modprobe test_dynamic_debug dyndbg=class,D2_CORE,+p

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
Co-developed-by: Łukasz Bartosik <ukaszb@...omium.org>
Signed-off-by: Łukasz Bartosik <ukaszb@...omium.org>
---
 lib/dynamic_debug.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 9283f2866415..56e09e878f80 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -293,6 +293,14 @@ 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,
@@ -306,8 +314,8 @@ 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 == '#')
@@ -323,7 +331,7 @@ 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,
@@ -595,7 +603,8 @@ 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;
 
-- 
2.48.1