dynamic_debug: move pr_err from module.c to ddebug_add_module

This serves two purposes: First, we get a diagnostic if (though
extremely unlikely), any of the calls of ddebug_add_module for built-in
code fails, effectively disabling dynamic_debug.  Second, I want to make
struct _ddebug opaque, and avoid accessing any of its members outside
dynamic_debug.[ch].

Link: http://lkml.kernel.org/r/20190212214150.4807-9-linux@rasmusvillemoes.dk
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Jason Baron <jbaron@akamai.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/module.c b/kernel/module.c
index 2ad1b52..7b1d437 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2720,9 +2720,7 @@ static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsig
        if (!debug)
                return;
 #ifdef CONFIG_DYNAMIC_DEBUG
-       if (ddebug_add_module(debug, num, mod->name))
-               pr_err("dynamic debug error adding module: %s\n",
-                       debug->modname);
+       ddebug_add_module(debug, num, mod->name);
 #endif
 }
 

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 7b76f43..7bdf98c 100644 (file)
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -849,8 +849,10 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
        struct ddebug_table *dt;
 
        dt = kzalloc(sizeof(*dt), GFP_KERNEL);
-       if (dt == NULL)
+       if (dt == NULL) {
+               pr_err("error adding module: %s\n", name);
                return -ENOMEM;
+       }
        /*
         * For built-in modules, name lives in .rodata and is
         * immortal. For loaded modules, name points at the name[]