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dynamic debug: combine dprintk and dynamic printk

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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>
This commit is contained in:
Jason Baron 2009-02-05 11:51:38 -05:00 • committed by Greg Kroah-Hartman
parent 095160aee9
commit e9d376f0fa
13 changed files with 867 additions and 543 deletions
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25
kernel/module.c
View file

@ -822,7 +822,7 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
mutex_lock(&module_mutex);
/* 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);
free_module(mod);
out:
@ -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)
{
#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
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);
}
#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
#ifdef CONFIG_DYNAMIC_DEBUG
if (ddebug_add_module(debug, num, debug->modname))
printk(KERN_ERR "dynamic debug error adding module: %s\n",
debug->modname);
#endif
}
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 */