Re: [PATCH v8 15/16] mm: make vma cache SLAB_TYPESAFE_BY_RCU

[Suren Baghdasaryan]

On Fri, Jan 10, 2025 at 12:47 PM 'Liam R. Howlett' via kernel-team
<kernel-team@xxxxxxxxxxx> wrote:
>
> * Suren Baghdasaryan <surenb@xxxxxxxxxx> [250110 15:35]:
> > On Fri, Jan 10, 2025 at 11:46 AM 'Liam R. Howlett' via kernel-team
> >
> > >
> > >     rwsem_acquire_read(old lock)
> > >     __refcount_inc_not_zero_limited() fails
> >
> > Are we looking at the same code
> > (https://lore.kernel.org/all/20250109023025.2242447-12-surenb@xxxxxxxxxx/)?
> > The sequence should be reversed here like this:
> >
> >      if (!__refcount_inc_not_zero_limited())
> >               return false;
> >      rwsem_acquire_read(old lock)
> >
> > and because __refcount_inc_not_zero_limited() fails,
> > rwsem_acquire_read(old lock) should never be called.
> >
>
> We are not, I had an older version of the patch from the 7th.
>
> Sorry for the confusion.

No worries. Thanks for taking a look!

>
> Thanks,
> Liam
>
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