On Fri, Jul 26, 2024 at 04:10:23PM +0900, Leesoo Ahn wrote:
> sparse_buffer_fini(..) takes the following actions even though the value of
> sparsemap_buf is NULL,
> 1. calculate size of sparsemap buffer (which is meaningless).
> 2. set sparsemap_buf variable to NULL (although it is already NULL).
>
> These steps are unnecessary if the variable, sparsemap_buf is NULL.
>
> Refactor the function to return right away if the variable is NULL.
> Hence, it doesn't need to take further actions.
sparse_buffer_fini() is called a few times on init so saving a jump (if at
all) does not worth the churn.
> Signed-off-by: Leesoo Ahn <lsahn@xxxxxxxxxx>
> ---
> mm/sparse.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index e4b830091d13..091e4bc2f72c 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -469,9 +469,13 @@ static void __init sparse_buffer_init(unsigned long size, int nid)
>
> static void __init sparse_buffer_fini(void)
> {
> - unsigned long size = sparsemap_buf_end - sparsemap_buf;
> + unsigned long size;
>
> - if (sparsemap_buf && size > 0)
> + if (!sparsemap_buf)
> + return;
> +
> + size = sparsemap_buf_end - sparsemap_buf;
> + if (size > 0)
> sparse_buffer_free(size);
> sparsemap_buf = NULL;
> }
> --
> 2.34.1
>
>
--
Sincerely yours,
Mike.
