On Thu, Jan 31, 2019 at 11:09 AM Reshetova, Elena <elena.reshetova@xxxxxxxxx> wrote: > > > On Thu, Jan 31, 2019 at 11:04 AM Reshetova, Elena > > <elena.reshetova@xxxxxxxxx> wrote: > > > > > > > Just to check, has this been tested with CONFIG_REFCOUNT_FULL and > > > > > something poking kcov? > > > > > > > > > > Given lib/refcount.c is instrumented, the refcount_*() calls will > > > > > recurse back into the kcov code. It looks like that's fine, given these > > > > > are only manipulated in setup/teardown paths, but it would be nice to be > > > > > sure. > > > > > > > > A simple program using KCOV is available here: > > > > https://elixir.bootlin.com/linux/v5.0-rc3/source/Documentation/dev- > > > > tools/kcov.rst#L42 > > > > or here (it's like strace but collects and prints KCOV coverage): > > > > https://github.com/google/syzkaller/blob/master/tools/kcovtrace/kcovtrace.c > > > > > > > > > > Ok, so I finally got to compile kcov in and try the first test program > > > and it works fine as far as I can see: runs, prints results, and no WARNs anywhere > > > visible with regards to refcount_t. > > > > > > I did my test on 4.20 with CONFIG_REFCOUNT_FULL=y > > > since I have serious issues getting 5.0 running as it is even from > > > the stable branch, but unless kcov underwent some serious changes since > > December, > > > it should not affect. > > > > There were no changes that should affect this part. > > > > Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> > > > Thank you! Will you be able to take this change forward as for > other normal kcov changes? Andrew, please take this patch to mm tree. +linux-mm mailing list for proper mm patch tracking I am not a maintainer, all other KCOV patches went through mm tree.
