netdev - Re: [Patch net-next] icmp: avoid allocating large struct on stack

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Date:	Sat, 01 Jun 2013 11:42:46 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Joe Perches <joe@...ches.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next] icmp: avoid allocating large struct on stack

On Fri, 2013-05-31 at 20:34 -0700, Joe Perches wrote:
> On Sat, 2013-06-01 at 11:24 +0800, Cong Wang wrote:
> > struct icmp_bxm is a large struct, reduce stack usage
> > by allocating it on heap.
> []
> > diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
> []
> > @@ -558,6 +558,10 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
> >  		}
> >  	}
> >  
> > +	icmp_param = kzalloc(sizeof(*icmp_param), GFP_ATOMIC);
> 
> why kzalloc if the previous stack was uninitialized?
> 
> 

Right, kmalloc() should be sufficient here...


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