On Tue, Dec 17, 2019 at 12:16 PM Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: > > > On Thu, Dec 12, 2019 at 7:15 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > > > > On Thu, 12 Dec 2019, Andrey Konovalov wrote: > > > > > > > > > This change extends kcov remote coverage support to allow collecting > > > > > coverage from interrupts in addition to kernel background threads. > > > > > > > > > > To collect coverage from code that is executed in interrupt context, a > > > > > part of that code has to be annotated with kcov_remote_start/stop() in a > > > > > similar way as how it is done for global kernel background threads. Then > > > > > the handle used for the annotations has to be passed to the > > > > > KCOV_REMOTE_ENABLE ioctl. > > > > > > > > > > Internally this patch adjusts the __sanitizer_cov_trace_pc() compiler > > > > > inserted callback to not bail out when called from interrupt context. > > > > > kcov_remote_start/stop() are updated to save/restore the current per > > > > > task kcov state in a per-cpu area (in case the interrupt came when the > > > > > kernel was already collecting coverage in task context). Coverage from > > > > > interrupts is collected into pre-allocated per-cpu areas, whose size is > > > > > controlled by the new CONFIG_KCOV_IRQ_AREA_SIZE. > > > > > > > > > > This patch also cleans up some of kcov debug messages. > > > > > > > > > > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> > > > > > --- > > > > > > > > > diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c > > > > > index 4c9d1e49d5ed..faf84ada71a5 100644 > > > > > --- a/drivers/usb/gadget/udc/dummy_hcd.c > > > > > +++ b/drivers/usb/gadget/udc/dummy_hcd.c > > > > > @@ -38,6 +38,7 @@ > > > > > #include <linux/usb/gadget.h> > > > > > #include <linux/usb/hcd.h> > > > > > #include <linux/scatterlist.h> > > > > > +#include <linux/kcov.h> > > > > > > > > > > #include <asm/byteorder.h> > > > > > #include <linux/io.h> > > > > > > > > That's the only change to this driver. As such, it doesn't appear to > > > > be needed, judging by the patch description. > > > > > > Right, will fix in the next version, thanks! > > > > Please also post a github or gerrit link. These small scraps of > > changes without context and better visualisation are extremely hard to > > review meaningfully. > > The link is in the cover letter: > > https://linux-review.googlesource.com/c/linux/kernel/git/torvalds/linux/+/2224/1 Sorry, missed. Now I can read it!
