On Sat, Jun 13, 2020 at 09:57:37AM -0600, Jim Cromie wrote:
> put pr_debug()s into most functions, to easily see code operate when
> module is loaded and used.
>
> #> dmesg -w &
> #> modprobe kset-example dyndbg=+pfml
> #> cat /sys/kernel/kset-example/*/*
> ---
> samples/kobject/kset-example.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c
> index c8010f126808..27c9b1beec28 100644
> --- a/samples/kobject/kset-example.c
> +++ b/samples/kobject/kset-example.c
> @@ -56,6 +56,7 @@ static ssize_t foo_attr_show(struct kobject *kobj,
> struct foo_attribute *attribute;
> struct foo_obj *foo;
>
> + pr_debug("called");
> attribute = to_foo_attr(attr);
> foo = to_foo_obj(kobj);
>
> @@ -76,6 +77,7 @@ static ssize_t foo_attr_store(struct kobject *kobj,
> struct foo_attribute *attribute;
> struct foo_obj *foo;
>
> + pr_debug("called");
> attribute = to_foo_attr(attr);
> foo = to_foo_obj(kobj);
>
> @@ -102,6 +104,7 @@ static void foo_release(struct kobject *kobj)
> {
> struct foo_obj *foo;
>
> + pr_debug("called");
> foo = to_foo_obj(kobj);
> kfree(foo);
> }
> @@ -112,6 +115,7 @@ static void foo_release(struct kobject *kobj)
> static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
> char *buf)
> {
> + pr_debug("called");
> return sprintf(buf, "%d\n", foo_obj->foo);
> }
>
> @@ -120,6 +124,7 @@ static ssize_t foo_store(struct foo_obj *foo_obj, struct
> foo_attribute *attr,
> {
> int ret;
>
> + pr_debug("called");
> ret = kstrtoint(buf, 10, &foo_obj->foo);
> if (ret < 0)
> return ret;
> @@ -140,6 +145,7 @@ static ssize_t b_show(struct foo_obj *foo_obj, struct
> foo_attribute *attr,
> {
> int var;
>
> + pr_debug("called");
> if (strcmp(attr->attr.name, "baz") == 0)
> var = foo_obj->baz;
> else
> @@ -152,6 +158,7 @@ static ssize_t b_store(struct foo_obj *foo_obj, struct
> foo_attribute *attr,
> {
> int var, ret;
>
> + pr_debug("called");
> ret = kstrtoint(buf, 10, &var);
> if (ret < 0)
> return ret;
> @@ -201,6 +208,7 @@ static struct foo_obj *create_foo_obj(const char *name)
> struct foo_obj *foo;
> int retval;
>
> + pr_debug("called");
> /* allocate the memory for the whole object */
> foo = kzalloc(sizeof(*foo), GFP_KERNEL);
> if (!foo)
> @@ -235,11 +243,13 @@ static struct foo_obj *create_foo_obj(const char *name)
>
> static void destroy_foo_obj(struct foo_obj *foo)
> {
> + pr_debug("called");
> kobject_put(&foo->kobj);
> }
>
> static int __init example_init(void)
> {
> + pr_debug("called");
Why??? If you want to do something like this, use ftrace, that is what
it is for.
thanks,
greg k-h
