commit 59cf47e7df31 dyndbg: export ddebug_exec_queries
left a few configs broken, fix them with ifdef stub-fns.

Rename the export to dynamic_debug_exec_queries().  This is a more
canonical function name, instead of exposing the 'ddebug' internal
name prefix.  Do this now, before export hits v5.9.0

Implement as new function wrapping ddebug_exec_queries(now static
again), which copies the query-string, preserving ddebug_exec_queries'
in-place parsing, while allowing users to pass const strings.

--
v2- fixes per Joe Perches

Signed-off-by: Jim Cromie <jim.cro...@gmail.com>
---
 include/linux/dynamic_debug.h | 20 ++++++++++++++++----
 lib/dynamic_debug.c           | 26 ++++++++++++++++++++++++--
 2 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index aa9ff9e1c0b3..8aa0c7c2608c 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -49,6 +49,10 @@ 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);
@@ -105,7 +109,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
        static_branch_unlikely(&descriptor.key.dd_key_false)
 #endif
 
-#else /* !HAVE_JUMP_LABEL */
+#else /* !CONFIG_JUMP_LABEL */
 
 #define _DPRINTK_KEY_INIT
 
@@ -117,7 +121,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
        unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)
 #endif
 
-#endif
+#endif /* CONFIG_JUMP_LABEL */
 
 #define __dynamic_func_call(id, fmt, func, ...) do {   \
        DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt);         \
@@ -172,10 +176,11 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
                                   KERN_DEBUG, prefix_str, prefix_type, \
                                   rowsize, groupsize, buf, len, ascii)
 
-#else
+#else /* !CONFIG_DYNAMIC_DEBUG_CORE */
 
 #include <linux/string.h>
 #include <linux/errno.h>
+#include <linux/printk.h>
 
 static inline int ddebug_add_module(struct _ddebug *tab, unsigned int n,
                                    const char *modname)
@@ -210,6 +215,13 @@ static inline int ddebug_dyndbg_module_param_cb(char 
*param, char *val,
                print_hex_dump(KERN_DEBUG, prefix_str, prefix_type,     \
                                rowsize, groupsize, buf, len, ascii);   \
        } while (0)
-#endif
+
+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;
+}
+
+#endif /* !CONFIG_DYNAMIC_DEBUG_CORE */
 
 #endif
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 01b7d0210412..a23b5d153153 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -525,7 +525,7 @@ static int ddebug_exec_query(char *query_string, const char 
*modname)
    last error or number of matching callsites.  Module name is either
    in param (for boot arg) or perhaps in query string.
 */
-int ddebug_exec_queries(char *query, const char *modname)
+static int ddebug_exec_queries(char *query, const char *modname)
 {
        char *split;
        int i, errs = 0, exitcode = 0, rc, nfound = 0;
@@ -557,7 +557,29 @@ int ddebug_exec_queries(char *query, const char *modname)
                return exitcode;
        return nfound;
 }
-EXPORT_SYMBOL_GPL(ddebug_exec_queries);
+
+/**
+ * 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 = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
+       if (!query)
+               return -ENOMEM;
+
+       rc = ddebug_exec_queries(qry, modname);
+       kfree(qry);
+       return rc;
+}
+EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
 
 #define PREFIX_SIZE 64
 
-- 
2.26.2

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