Re: [PATCH 1/2] mm: KSM: fix ksm_run data type

[Pavel Tatashin]

On Thu, Jul 15, 2021 at 2:18 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>
> On Fri, Jul 16, 2021 at 12:01:01AM +0600, Zhansaya Bagdauletkyzy wrote:
> > +++ b/mm/ksm.c
> > @@ -289,7 +289,7 @@ static int ksm_nr_node_ids = 1;
> >  #define KSM_RUN_MERGE        1
> >  #define KSM_RUN_UNMERGE      2
> >  #define KSM_RUN_OFFLINE      4
> > -static unsigned long ksm_run = KSM_RUN_STOP;
> > +static unsigned int ksm_run = KSM_RUN_STOP;
>
> Should this be an enum instead?

I think "unsigned int" is OK here, as it is exposed as uint to users:
Documentation/ABI/testing/sysfs-kernel-mm-ksm

/sys/kernel/mm/ksm/run

run: write 0 to disable ksm, read 0 while ksm is disabled.

- write 1 to run ksm, read 1 while ksm is running.
- write 2 to disable ksm and unmerge all its pages.

Pasha