netdev - Re: [PATCH net-next v5] rtnetlink: add new RTM

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Message-ID: <1461032539.10638.143.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Mon, 18 Apr 2016 19:22:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	roopa@...ulusnetworks.com, netdev@...r.kernel.org,
	jhs@...atatu.com, tgraf@...g.ch, nicolas.dichtel@...nd.com
Subject: Re: [PATCH net-next v5] rtnetlink: add new RTM_GETSTATS message to
 dump link stats

On Mon, 2016-04-18 at 21:48 -0400, David Miller wrote:

> 
> And anyways, I get unaligned accesses without Roopa's changes :-/
> 
> davem@...ience:~$ ip l l
> [3391066.656729] Kernel unaligned access at TPC[7d6c14] loopback_get_stats64+0x74/0xa0
> [3391066.672020] Kernel unaligned access at TPC[7d6c18] loopback_get_stats64+0x78/0xa0
> [3391066.687282] Kernel unaligned access at TPC[7d6c1c] loopback_get_stats64+0x7c/0xa0
> [3391066.702573] Kernel unaligned access at TPC[7d6c20] loopback_get_stats64+0x80/0xa0
> [3391066.717858] Kernel unaligned access at TPC[8609dc] dev_get_stats+0x3c/0xe0

Yes, rtnl_fill_stats() probably has the same mistake.

commit 550bce59baf3f3059cd4ae1e268f08f2d2cb1d5c
Author: Roopa Prabhu <roopa@...ulusnetworks.com>
Date:   Fri Apr 15 20:36:25 2016 -0700

    rtnetlink: rtnl_fill_stats: avoid an unnecssary stats copy
    
    This patch passes netlink attr data ptr directly to dev_get_stats
    thus elimiating a stats copy.
    
    Suggested-by: David Miller <davem@...emloft.net>
    Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>