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dynamic_debug: move pr_err from module.c to ddebug_add_module

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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>
This commit is contained in:
Rasmus Villemoes 2019-03-07 16:27:48 -08:00 committed by Linus Torvalds
parent f008043bd3
commit 513770f54e
2 changed files with 4 additions and 4 deletions
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4
kernel/module.c
View File

@ -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
}

4
lib/dynamic_debug.c
View File

@ -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[]