Re: [PATCH v3] mm/memcontrol: use kstrtobool for swapaccount param parsing

From: Michal Hocko
Date: Mon Sep 19 2022 - 11:01:24 EST


On Tue 13-09-22 15:13:58, Liu Shixin wrote:
> Use kstrtobool which is more powerful to handle all kinds of parameters
> like 'Yy1Nn0' or [oO][NnFf] for "on" and "off".

the main usefulness is with the code reusability of library functions
rather than ad-hoc stuff.

> Signed-off-by: Liu Shixin <liushixin2@xxxxxxxxxx>

Acked-by: Michal Hocko <mhocko@xxxxxxxx>

Thanks!
> ---
> mm/memcontrol.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 0a1a8a846870..5511c0c120d9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -7434,10 +7434,10 @@ bool mem_cgroup_swap_full(struct folio *folio)
>
> static int __init setup_swap_account(char *s)
> {
> - if (!strcmp(s, "1"))
> - cgroup_memory_noswap = false;
> - else if (!strcmp(s, "0"))
> - cgroup_memory_noswap = true;
> + bool res;
> +
> + if (!kstrtobool(s, &res))
> + cgroup_memory_noswap = !res;
> return 1;
> }
> __setup("swapaccount=", setup_swap_account);
> --
> 2.25.1

--
Michal Hocko
SUSE Labs