Re: [PATCH 13/26] locking: Add non-fatal spin lock assert
From: Ingo Molnar
Date: Thu Sep 04 2014 - 01:14:22 EST
* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Wed, Sep 03, 2014 at 10:50:01AM -0400, Peter Hurley wrote:
> > So a lockdep-only assert is unlikely to draw attention to existing bugs,
> > especially in established drivers.
>
> By the same logic lockdep will not find locking errors in established
> drivers.
Indeed, this patch is ill-advised in several ways:
- it extends an API variant that we want to phase
- emits a warning even if say lockdep has already emitted a
warning and locking state is not guaranteed to be consistent.
- makes the kernel more expensive once fully debugged, in that
non-fatal checks are unconditional.
Also please submit locking related patches as standalone series
to the locking subsystem, not embedded in an unrelated series.
Thanks,
Ingo
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