On Fri, Jul 06, 2018 at 11:23:27PM +0200, Oscar Salvador wrote:
> On Fri, Jul 06, 2018 at 01:06:58PM -0600, Ross Zwisler wrote:
> > The following commit in -next:
> >
> > commit 054620849110 ("mm/sparse.c: make sparse_init_one_section void and
> > remove check")
> >
> > changed how the error handling in sparse_add_one_section() works.
> >
> > Previously sparse_index_init() could return -EEXIST, and the function would
> > continue on happily. 'ret' would get unconditionally overwritten by the
> > result from sparse_init_one_section() and the error code after the 'out:'
> > label wouldn't be triggered.
>
> My bad, I missed that.
>
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 9574113fc745..d254bd2d3289 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -753,8 +753,12 @@ int __meminit sparse_add_one_section(struct
> > pglist_data *pgdat,
> > * plus, it does a kmalloc
> > */
> > ret = sparse_index_init(section_nr, pgdat->node_id);
> > - if (ret < 0 && ret != -EEXIST)
> > - return ret;
> > + if (ret < 0) {
> > + if (ret == -EEXIST)
> > + ret = 0;
> > + else
> > + return ret;
> > + }
>
> sparse_index_init() can return:
>
> -ENOMEM, -EEXIST or 0.
>
> So what about this?:
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index f55e79fda03e..eb188eb6b82d 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -770,6 +770,7 @@ int __meminit sparse_add_one_section(struct pglist_data
> *pgdat,
> ret = sparse_index_init(section_nr, pgdat->node_id);
> if (ret < 0 && ret != -EEXIST)
> return ret;
> + ret = 0;
>
> Does this look more clean?
Sure, that's probably better.
Andrew, what's the easiest way forward? I can send out a v2, you can fold
this into his previous patch, or something else?
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