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SubjectRe: [PATCH 2/2] lockdep: choose to continue lock debugging despite taint
On Fri, Apr 10, 2009 at 03:45:20PM +0200, Ingo Molnar wrote:
>
> * Frederic Weisbecker <fweisbec@gmail.com> wrote:
>
> > On Fri, Apr 10, 2009 at 02:15:15PM +0200, Ingo Molnar wrote:
> > >
> > > * Frederic Weisbecker <fweisbec@gmail.com> wrote:
> > >
> > > > Lockdep is disabled after any kernel taints. This might be
> > > > convenient to ignore bad locking issues which sources come from
> > > > outside the kernel tree. Nevertheless, it might be a frustrating
> > > > experience for the staging developers or anyone who might develop
> > > > a kernel that happens to be tainted.
> > >
> > > Good point. Not having lockdep coverage for drivers/staging/ just
> > > prolongs their transition - not good.
> > >
> > > But instead of this:
> > >
> > > > void add_taint(unsigned flag)
> > > > {
> > > > +#ifndef CONFIG_LOCKDEP_IGNORE_TAINT
> > > > /*
> > > > * Can't trust the integrity of the kernel anymore.
> > > > * We don't call directly debug_locks_off() because the issue
> > > > @@ -220,6 +221,7 @@ void add_taint(unsigned flag)
> > > > */
> > > > if (xchg(&debug_locks, 0))
> > > > printk(KERN_WARNING "Disabling lockdep due to kernel taint\n");
> > > > +#endif
> > >
> > > I'd suggest to not do the debug_locks_off() call if TAINT_CRAP. I.e.
> > > something like:
> > >
> > > if (!(flag & TAINT_CRAP) && debug_locks_off())
> > > printk(...);
> > >
> > > will do the trick.
> > >
> > > Ingo
> >
> >
> > Ok, but this is not only about staging. It's also about
> > TAINT_WARN. Just imagine that you report a warning to a
> > maintainer, and while you are waiting for it to be fixed, you
> > can't use lockdep for your own needs.
> >
> > Hm?
>
> We can exclude TAINT_WARN too - i.e. (TAINT_CRAP|TAINT_WARN).
>
> Ingo


Fine :-)

See the v2 on further mails in this thread.

Side request: do you think you could merge them on kill-the-BKL tree?

Thanks!



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