Re: PROBLEM: kernel crashes when running xfsdump since ~6.4

[Hailong Liu <hailong.liu@oppo.com>]

On Mon, 24. Jun 14:18, Uladzislau Rezki wrote:
> >
> > IMO, I thought we can fix this by following.
> > It doesn't initialize unused variables and utilize the percpu xarray. If I said
> > anything wrong, please do let me know. I can learn a lot from you all :).
> >
> >
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index 11fe5ea208aa..f9f981674b2d 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -4480,17 +4480,21 @@ void __init vmalloc_init(void)
> >          */
> >         vmap_area_cachep = KMEM_CACHE(vmap_area, SLAB_PANIC);
> >
> > -       for_each_possible_cpu(i) {
> > +       for (i = 0; i < nr_cpu_ids; i++) {
> >                 struct vmap_block_queue *vbq;
> >                 struct vfree_deferred *p;
> >
> >                 vbq = &per_cpu(vmap_block_queue, i);
> > +               xa_init(&vbq->vmap_blocks);
> > +
> > +               if (!cpu_possible(i))
> Why do you need such check?
IIUC, take this issue as example, cpumask is b101 and nr_cpu_id is
3, if i = 1, There is no need to initialize unused variables here;
initializing the xarray for the hash index is sufficient.
>
> Thanks!
>
> --
> Uladzislau Rezki

--
help you, help me,
Hailong.