On 18 Mar 2021, at 8:27, Miaohe Lin wrote:

> It's guaranteed that huge_zero_page will not be NULL if huge_zero_refcount
> is increased successfully. When READ_ONCE(huge_zero_page) is returned,
> there must be a huge_zero_page and it can be replaced with returning 'true'
> when we do not care about the value of huge_zero_page. We can thus make it
> return bool to save READ_ONCE cpu cycles as the return value is just used
> to check if huge_zero_page exists.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
>  mm/huge_memory.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
LGTM. Reviewed-by: Zi Yan <ziy@nvidia.com>

—
Best Regards,
Yan Zi