linux-kernel - [PATCH 4/5] dyndbg: drop EXPORTed dynamic_debug_exec

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Date:   Thu, 10 Mar 2022 21:47:55 -0700
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Cc:     daniel.vetter@...ll.ch, seanpaul@...omium.org, robdclark@...il.com,
        linux@...musvillemoes.dk, joe@...ches.com,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 4/5] dyndbg: drop EXPORTed dynamic_debug_exec_queries

This exported fn is effectively obsoleted by Commit:HEAD~2, so remove it.

Its intent was to allow drm.debug to use the exported function to
implement its drm.debug bitmap api using dynamic_debug.  Instead,
HEAD~2 implements the bitmap inside dyndbg, using the internal fn that
the export wraps.

Since there are no other expected users, and any prospects would
likely reuse the bitmap or a straightforward extension of it, we can
drop the exported function until its really needed.

This also drops the CONFIG_DYNAMIC_DEBUG=N stub-func, and its
pr_warn(), which I avoided in 2012, then added in 2020 :-/

Fixes: a2d375eda771 ("dyndbg: refine export, rename to dynamic_debug_exec_queries()")
Fixes: 4c0d77828d4f ("dyndbg: export ddebug_exec_queries")
Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 include/linux/dynamic_debug.h |  9 ---------
 lib/dynamic_debug.c           | 29 -----------------------------
 2 files changed, 38 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index e83c4e36ad29..664bb83778d2 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -60,9 +60,6 @@ struct _ddebug {
 
 #if defined(CONFIG_DYNAMIC_DEBUG_CORE)
 
-/* exported for module authors to exercise >control */
-int dynamic_debug_exec_queries(const char *query, const char *modname);
-
 int ddebug_add_module(struct _ddebug *tab, unsigned int n,
 				const char *modname);
 extern int ddebug_remove_module(const char *mod_name);
@@ -253,12 +250,6 @@ static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
 				rowsize, groupsize, buf, len, ascii);	\
 	} while (0)
 
-static inline int dynamic_debug_exec_queries(const char *query, const char *modname)
-{
-	pr_warn("kernel not built with CONFIG_DYNAMIC_DEBUG_CORE\n");
-	return 0;
-}
-
 struct kernel_param;
 static inline int param_set_dyndbg_classbits(const char *instr, const struct kernel_param *kp)
 { return 0; }
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 704361af5b23..b15a9c715e5b 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -582,35 +582,6 @@ static int ddebug_exec_queries(char *query, const char *modname)
 	return nfound;
 }
 
-/**
- * dynamic_debug_exec_queries - select and change dynamic-debug prints
- * @query: query-string described in admin-guide/dynamic-debug-howto
- * @modname: string containing module name, usually &module.mod_name
- *
- * This uses the >/proc/dynamic_debug/control reader, allowing module
- * authors to modify their dynamic-debug callsites. The modname is
- * canonically struct module.mod_name, but can also be null or a
- * module-wildcard, for example: "drm*".
- */
-int dynamic_debug_exec_queries(const char *query, const char *modname)
-{
-	int rc;
-	char *qry; /* writable copy of query */
-
-	if (!query) {
-		pr_err("non-null query/command string expected\n");
-		return -EINVAL;
-	}
-	qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
-	if (!qry)
-		return -ENOMEM;
-
-	rc = ddebug_exec_queries(qry, modname);
-	kfree(qry);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
-
 #ifdef CONFIG_MODULES
 #define KP_MOD_NAME kp->mod->name
 #else
-- 
2.35.1