Quoting Mika Kuoppala (2019-07-04 16:44:05)
> +#define set_pd_entry(pd, pde, to) ({ \
> + __write_pd_entry((pd), (pde), px_base(to), gen8_pde_encode); \
> + atomic_inc(&(pd)->used); \
inc before write so that you have a nice onion with clear.
> +})
> +
> +#define clear_pd_entry(pd, pde, to) ({ \
You want to pull the GEM_BUG_ON here so that is tightly coupled with the
atomic_dec -- it's an underflow check.
> + __write_pd_entry((pd), (pde), px_base(to), gen8_pde_encode); \
> + atomic_dec(&pd->used); \
> +})
I would have preferred these as inlines (even if means "passing" an
extra arg), but let's see what the next two patches bring.
-Chris
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