The patch titled Subject: usb, kcov: collect coverage from hub_event has been added to the -mm tree. Its filename is usb-kcov-collect-coverage-from-hub_event.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/usb-kcov-collect-coverage-from-hub_event.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/usb-kcov-collect-coverage-from-hub_event.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Subject: usb, kcov: collect coverage from hub_event Add kcov_remote_start()/kcov_remote_stop() annotations to the hub_event() function, which is responsible for processing events on USB buses, in particular events that happen during USB device enumeration. Since hub_event() is run in a global background kernel thread (see Documentation/dev-tools/kcov.rst for details), each USB bus gets a unique global handle from the USB subsystem kcov handle range. As the result kcov can now be used to collect coverage from events that happen on a particular USB bus. Link: http://lkml.kernel.org/r/de4fe1c219db2d002d905dc1736e2a3bfa1db997.1572366574.git.andreyknvl@xxxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Anders Roxell <anders.roxell@xxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: David Windsor <dwindsor@xxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Elena Reshetova <elena.reshetova@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/hub.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/usb/core/hub.c~usb-kcov-collect-coverage-from-hub_event +++ a/drivers/usb/core/hub.c @@ -29,6 +29,7 @@ #include <linux/random.h> #include <linux/pm_qos.h> #include <linux/kobject.h> +#include <linux/kcov.h> #include <linux/uaccess.h> #include <asm/byteorder.h> @@ -5374,6 +5375,8 @@ static void hub_event(struct work_struct hub_dev = hub->intfdev; intf = to_usb_interface(hub_dev); + kcov_remote_start_usb((u64)hdev->bus->busnum); + dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", hdev->state, hdev->maxchild, /* NOTE: expects max 15 ports... */ @@ -5480,6 +5483,8 @@ out_hdev_lock: /* Balance the stuff in kick_hub_wq() and allow autosuspend */ usb_autopm_put_interface(intf); kref_put(&hub->kref, hub_release); + + kcov_remote_stop(); } static const struct usb_device_id hub_id_table[] = { _ Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are kcov-remote-coverage-support.patch usb-kcov-collect-coverage-from-hub_event.patch vhost-kcov-collect-coverage-from-vhost_worker.patch