linux-kernel - Re: [PATCH v3 1/2] mm/sparse: add sparse_init

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Date:   Sun, 1 Jul 2018 23:05:03 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     bhe@...hat.com
Cc:     Steven Sistare <steven.sistare@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kirill.shutemov@...ux.intel.com, Michal Hocko <mhocko@...e.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        dan.j.williams@...el.com, jack@...e.cz, jglisse@...hat.com,
        Souptick Joarder <jrdr.linux@...il.com>,
        gregkh@...uxfoundation.org, Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org, osalvador@...hadventures.net
Subject: Re: [PATCH v3 1/2] mm/sparse: add sparse_init_nid()

> > +     if (!usemap) {
> > +             pr_err("%s: usemap allocation failed", __func__);
>
> Wondering if we can provide more useful information for better debugging
> if failed. E.g here tell on what nid the usemap allocation failed.
>
> > +                                                pnum, nid);
> > +             if (!map) {
> > +                     pr_err("%s: memory map backing failed. Some memory will not be available.",
> > +                            __func__);
> And here tell nid and the memory section nr failed.

Sure, I will wait for more comments, if any, and add more info to the
error messages in the next revision.

Thank you,
Pavel