linux-kernel - Re: [PATCH 3/3] mm, nobootmem: do memset() after memblock

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Message-ID: <20130319055808.GE8858@lge.com>
Date:	Tue, 19 Mar 2013 14:58:08 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Johannes Weiner <hannes@...xchg.org>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH 3/3] mm, nobootmem: do memset() after memblock_reserve()

On Mon, Mar 18, 2013 at 10:53:04PM -0700, Yinghai Lu wrote:
> On Mon, Mar 18, 2013 at 10:16 PM, Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> > Currently, we do memset() before reserving the area.
> > This may not cause any problem, but it is somewhat weird.
> > So change execution order.
> >
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> > diff --git a/mm/nobootmem.c b/mm/nobootmem.c
> > index 589c673..f11ec1c 100644
> > --- a/mm/nobootmem.c
> > +++ b/mm/nobootmem.c
> > @@ -46,8 +46,8 @@ static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
> >                 return NULL;
> >
> >         ptr = phys_to_virt(addr);
> > -       memset(ptr, 0, size);
> >         memblock_reserve(addr, size);
> > +       memset(ptr, 0, size);
> 
> move down ptr = ... too ?
Okay.
I will send v2 soon.

> 
> >         /*
> >          * The min_count is set to 0 so that bootmem allocated blocks
> >          * are never reported as leaks.
> > --
> > 1.7.9.5
> >
> 
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