[PATCH v2 1/2] kasan: support instrumented bitops combined with generic bitops

[Marco Elver]

On Wed, 20 Nov 2019 at 08:42, Daniel Axtens <dja at axtens.net> wrote:
>
> > But the docs do seem to indicate that it's atomic (for whatever that
> > means for a single read operation?), so you are right, it should live in
> > instrumented-atomic.h.
>
> Actually, on further inspection, test_bit has lived in
> bitops/non-atomic.h since it was added in 4117b02132d1 ("[PATCH] bitops:
> generic __{,test_and_}{set,clear,change}_bit() and test_bit()")
>
> So to match that, the wrapper should live in instrumented-non-atomic.h
> too.
>
> If test_bit should move, that would need to be a different patch. But I
> don't really know if it makes too much sense to stress about a read
> operation, as opposed to a read/modify/write...

That's fair enough. I suppose this can stay where it is because it's
not hurting anyone per-se, but the only bad thing about it is that
kernel-api documentation will present test_bit() in non-atomic
operations.

Thanks,
-- Marco