> -----Original Message-----
> From: Thomas Monjalon <tho...@monjalon.net>
> Sent: Tuesday, November 26, 2019 9:30 PM
> To: Burakov, Anatoly <anatoly.bura...@intel.com>
> Cc: Xueming(Steven) Li <xuemi...@mellanox.com>; dev@dpdk.org; Asaf
> Penso <as...@mellanox.com>; sta...@dpdk.org;
> david.march...@redhat.com
> Subject: Re: [dpdk-dev] [PATCH] malloc: fix memory element size in case of
> padding
>
> 26/11/2019 13:57, Burakov, Anatoly:
> > On 25-Nov-19 11:24 PM, Thomas Monjalon wrote:
> > > 21/11/2019 16:14, Burakov, Anatoly:
> > >> On 21-Nov-19 2:25 PM, Xueming Li wrote:
> > >>> This patch fixes wrong inner memory element size when joining two
> > >>> elements.
> > >>>
> > >>> Fixes: af75078fece3 ("first public release")
> > >>> Cc: sta...@dpdk.org
> > >>>
> > >>> Signed-off-by: Xueming Li <xuemi...@mellanox.com>
> > >>> ---
> > >>> --- a/lib/librte_eal/common/malloc_elem.c
> > >>> +++ b/lib/librte_eal/common/malloc_elem.c
> > >>> @@ -487,6 +487,10 @@ join_elem(struct malloc_elem *elem1, struct
> malloc_elem *elem2)
> > >>> else
> > >>> elem1->heap->last = elem1;
> > >>> elem1->next = next;
> > >>> + if (elem1->pad) {
> > >>> + struct malloc_elem *inner = RTE_PTR_ADD(elem1, elem1-
> >pad);
> > >>> + inner->size = elem1->size - elem1->pad;
> > >>> + }
> > >>> }
> > >>
> > >> Reviewed-by: Anatoly Burakov <anatoly.bura...@intel.com>
> > >
> > > I don't understand this patch.
> > > The variable inner is never used.
> > > What am I missing?
> > >
> >
> > For padded elements, malloc element has two headers - the "outer"
> > header with empty space after it, and the "inner" header, after which
> > the user memory actually starts. This makes it so that, when joining
> > elements, if the outer element had a pad, we also update the inner
> element size to match.
>
> Where the variable "inner" is used in this function?
>
Rte_realloc, inner size is used to copy data.
