On Mon, Feb 29, 2016 at 8:50 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> In __d_entry_type(), you mean? Should be, along with READ_ONCE() there.
> AFAICS, ordering shouldn't be an issue anymore...
That's the one.
It results in those barriers in very subtle places, and it was always
unclear whether any of the users of those "d_is_*()" helper functions
really understood the subtle memory ordering involved.
The smp_rmb() is also potentially quite expensive on some architectures.
So getting rid of those hidden memory orderings would be a goodness
quite apart from fixing the bug Dmitry found.
Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
