From: Steven King <sfking@fdwdc.com>
Organization: fdwdc
To: Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [uClinux-dev] v3.15-rc1 slab allocator broken on m68knommu (coldfire)
Date: Wed, 16 Apr 2014 10:44:11 -0700
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Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        uClinux development list <uclinux-dev@uclinux.org>
References: <201404141745.44279.sfking@fdwdc.com> <201404160847.27300.sfking@fdwdc.com> <CAMuHMdV2zSWaDbHNv3QQeEgu26PQX9TWn7cHA=4U0YOK0bbExg@mail.gmail.com>
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On Wednesday 16 April 2014 9:06:57 am Geert Uytterhoeven wrote:
> Hi Steven,
>
> On Wed, Apr 16, 2014 at 5:47 PM, Steven King <sfking@fdwdc.com> wrote:
> > --- a/mm/slab.c
> > +++ b/mm/slab.c
> > @@ -2572,13 +2572,13 @@ static void *alloc_slabmgmt(struct kmem_cache
> > *cachep, return freelist;
> >  }
> >
> > -static inline freelist_idx_t get_free_obj(struct page *page, unsigned
> > char idx) +static inline freelist_idx_t get_free_obj(struct page *page,
> > unsigned int idx) {
> >         return ((freelist_idx_t *)page->freelist)[idx];
> >  }
> >
> >  static inline void set_free_obj(struct page *page,
> > -                                       unsigned char idx, freelist_idx_t
> > val) +                                       unsigned int idx,
> > freelist_idx_t val) {
> >         ((freelist_idx_t *)(page->freelist))[idx] = val;
> >  }
> >
> >
> > then v3.15-rc1 will boot using the slab allocator.
>
> Is "idx" ever larger than 255?
>
> Gr{oetje,eeting}s,

Yes.  If I stick

        if (idx > 255)
                pr_info("%s %d\n", __func__, idx);

in get_free_obj and set_free_obj and see values for idx up into the 400s.
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