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Date: Wed, 21 Sep 2016 09:14:59 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Hannes Frederic Sowa <hannes@...essinduktion.org> Cc: Sowmini Varadhan <sowmini.varadhan@...cle.com>, netdev@...r.kernel.org, jbenc@...hat.com, davem@...emloft.net Subject: Re: [PATCH net-next V2] net/vxlan: Avoid unaligned access in vxlan_build_skb() On Wed, Sep 21, 2016 at 12:10:55PM +0200, Hannes Frederic Sowa wrote: > On 20.09.2016 20:57, Sowmini Varadhan wrote: > > The vxlan header may not be aligned to 4 bytes in > > vxlan_build_skb (e.g., for MLD packets). This patch > > avoids unaligned access traps from vxlan_build_skb > > (in platforms like sparc) by making struct vxlanhdr __packed. > > > > Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com> > > Performance wise this should only affect code generation for archs where > it matters anyway. I think it's the opposite. Even on x86 compiler will use byte loads.
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