linux-kernel - [PATCH v3 2/3] dyndbg: Remove support for ddebug

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Message-Id: <1634139622-20667-3-git-send-email-jbaron@akamai.com>
Date:   Wed, 13 Oct 2021 11:40:21 -0400
From:   Jason Baron <jbaron@...mai.com>
To:     gregkh@...uxfoundation.org
Cc:     ahalaney@...hat.com, jim.cromie@...il.com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/3] dyndbg: Remove support for ddebug_query param

From: Andrew Halaney <ahalaney@...hat.com>

This param has been deprecated for a very long time now, let's rip it
out.

Signed-off-by: Andrew Halaney <ahalaney@...hat.com>
Signed-off-by: Jason Baron <jbaron@...mai.com>
---
 Documentation/admin-guide/dynamic-debug-howto.rst |  6 ++----
 Documentation/admin-guide/kernel-parameters.txt   |  5 -----
 lib/dynamic_debug.c                               | 25 -----------------------
 3 files changed, 2 insertions(+), 34 deletions(-)

diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index b119b8277b3e..d0911e7cc271 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -249,8 +249,7 @@ Debug messages during Boot Process
 
 To activate debug messages for core code and built-in modules during
 the boot process, even before userspace and debugfs exists, use
-``dyndbg="QUERY"``, ``module.dyndbg="QUERY"``, or ``ddebug_query="QUERY"``
-(``ddebug_query`` is obsoleted by ``dyndbg``, and deprecated).  QUERY follows
+``dyndbg="QUERY"`` or ``module.dyndbg="QUERY"``.  QUERY follows
 the syntax described above, but must not exceed 1023 characters.  Your
 bootloader may impose lower limits.
 
@@ -270,8 +269,7 @@ this boot parameter for debugging purposes.
 
 If ``foo`` module is not built-in, ``foo.dyndbg`` will still be processed at
 boot time, without effect, but will be reprocessed when module is
-loaded later. ``ddebug_query=`` and bare ``dyndbg=`` are only processed at
-boot.
+loaded later. Bare ``dyndbg=`` is only processed at boot.
 
 
 Debug Messages at Module Initialization Time
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 91ba391f9b32..9c0c57d1ca78 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -841,11 +841,6 @@
 			Format: <port#>,<type>
 			See also Documentation/input/devices/joystick-parport.rst
 
-	ddebug_query=	[KNL,DYNAMIC_DEBUG] Enable debug messages at early boot
-			time. See
-			Documentation/admin-guide/dynamic-debug-howto.rst for
-			details.  Deprecated, see dyndbg.
-
 	debug		[KNL] Enable kernel debugging (events log level).
 
 	debug_boot_weak_hash
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 84c16309cc63..130ce0eb550d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -746,21 +746,6 @@ EXPORT_SYMBOL(__dynamic_ibdev_dbg);
 
 #endif
 
-#define DDEBUG_STRING_SIZE 1024
-static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
-
-static __init int ddebug_setup_query(char *str)
-{
-	if (strlen(str) >= DDEBUG_STRING_SIZE) {
-		pr_warn("ddebug boot param string too large\n");
-		return 0;
-	}
-	strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
-	return 1;
-}
-
-__setup("ddebug_query=", ddebug_setup_query);
-
 /*
  * Install a noop handler to make dyndbg look like a normal kernel cli param.
  * This avoids warnings about dyndbg being an unknown cli param when supplied
@@ -1133,16 +1118,6 @@ static int __init dynamic_debug_init(void)
 		 entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10),
 		 (int)((entries * sizeof(struct _ddebug)) >> 10));
 
-	/* apply ddebug_query boot param, dont unload tables on err */
-	if (ddebug_setup_string[0] != '\0') {
-		pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
-		ret = ddebug_exec_queries(ddebug_setup_string, NULL);
-		if (ret < 0)
-			pr_warn("Invalid ddebug boot param %s\n",
-				ddebug_setup_string);
-		else
-			pr_info("%d changes by ddebug_query\n", ret);
-	}
 	/* now that ddebug tables are loaded, process all boot args
 	 * again to find and activate queries given in dyndbg params.
 	 * While this has already been done for known boot params, it
-- 
2.7.4