path: root/kernel
diff options
authorJason Baron <jbaron@redhat.com>2009-02-05 11:51:38 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:38:26 -0700
commite9d376f0fa66bd630fe27403669c6ae6c22a868f (patch)
tree6eadef32eb421647ae98d88341b9aceb259aaf22 /kernel
parent095160aee954688a9bad225952c4bee546541e19 (diff)
dynamic debug: combine dprintk and dynamic printk
This patch combines Greg Bank's dprintk() work with the existing dynamic printk patchset, we are now calling it 'dynamic debug'. The new feature of this patchset is a richer /debugfs control file interface, (an example output from my system is at the bottom), which allows fined grained control over the the debug output. The output can be controlled by function, file, module, format string, and line number. for example, enabled all debug messages in module 'nf_conntrack': echo -n 'module nf_conntrack +p' > /mnt/debugfs/dynamic_debug/control to disable them: echo -n 'module nf_conntrack -p' > /mnt/debugfs/dynamic_debug/control A further explanation can be found in the documentation patch. Signed-off-by: Greg Banks <gnb@sgi.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
1 files changed, 10 insertions, 15 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 1196f5d11700..77672233387f 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -822,7 +822,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
/* Store the name of the last unloaded module for diagnostic purposes */
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
- unregister_dynamic_debug_module(mod->name);
+ ddebug_remove_module(mod->name);
@@ -1827,19 +1827,13 @@ static inline void add_kallsyms(struct module *mod,
#endif /* CONFIG_KALLSYMS */
-static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
+static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
- unsigned int i;
- for (i = 0; i < num; i++) {
- register_dynamic_debug_module(debug[i].modname,
- debug[i].type,
- debug[i].logical_modname,
- debug[i].flag_names,
- debug[i].hash, debug[i].hash2);
- }
+ if (ddebug_add_module(debug, num, debug->modname))
+ printk(KERN_ERR "dynamic debug error adding module: %s\n",
+ debug->modname);
static void *module_alloc_update_bounds(unsigned long size)
@@ -2213,12 +2207,13 @@ static noinline struct module *load_module(void __user *umod,
add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
if (!mod->taints) {
- struct mod_debug *debug;
+ struct _ddebug *debug;
unsigned int num_debug;
debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
sizeof(*debug), &num_debug);
- dynamic_printk_setup(debug, num_debug);
+ if (debug)
+ dynamic_debug_setup(debug, num_debug);
/* sechdrs[0].sh_size is always zero */

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