| Message ID | 453d1fe3843d576eeeef6f8536eead59c1e566f3.1571762488.git.andreyknvl@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | kcov: collect coverage from usb and vhost | expand |
On Wed, Oct 23, 2019 at 9:11 PM kbuild test robot <lkp@intel.com> wrote: > > Hi Andrey, > > Thank you for the patch! Yet something to improve: > > [auto build test ERROR on linus/master] > [cannot apply to v5.4-rc4 next-20191023] > [if your patch is applied to the wrong git tree, please drop us a note to help > improve the system. BTW, we also suggest to use '--base' option to specify the > base tree in git format-patch, please see https://stackoverflow.com/a/37406982] > > url: https://github.com/0day-ci/linux/commits/Andrey-Konovalov/kcov-collect-coverage-from-usb-and-vhost/20191023-185245 > base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3b7c59a1950c75f2c0152e5a9cd77675b09233d6 > config: s390-allmodconfig (attached as .config) > compiler: s390-linux-gcc (GCC) 7.4.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > GCC_VERSION=7.4.0 make.cross ARCH=s390 > > If you fix the issue, kindly add following tag > Reported-by: kbuild test robot <lkp@intel.com> > > All errors (new ones prefixed by >>): > > >> ERROR: "kcov_remote_stop" [drivers/usb/core/usbcore.ko] undefined! > >> ERROR: "kcov_remote_start" [drivers/usb/core/usbcore.ko] undefined! Indeed, we need EXPORT_SYMBOL() for kcov_common_handle(), kcov_remote_start() and kcov_remote_stop(). Will fix in v3. > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 236313f41f4a..2634976dab3b 100644 --- a/drivers/usb/core/hub.c +++ b/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 *work) hub_dev = hub->intfdev; intf = to_usb_interface(hub_dev); + kcov_remote_start(kcov_remote_handle_usb(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 @@ static void hub_event(struct work_struct *work) /* 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[] = {
This patch adds 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 id from the USB subsystem kcov handle id range. As the result kcov can now be used to collect coverage from events that happen on a particular USB bus. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- drivers/usb/core/hub.c | 5 +++++ 1 file changed, 5 insertions(+)