From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: nicolas.dichtel@6wind.com, netdev@vger.kernel.org,
philipp.reisner@linbit.com, drbd-dev@lists.linbit.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2] block/drbd: use nla_put_u64_64bit()
Date: Wed, 04 May 2016 10:13:36 -0700 [thread overview]
Message-ID: <1462382016.5535.348.camel@edumazet-glaptop3.roam.corp.google.com> (raw)
In-Reply-To: <20160504.125057.1606520320212390037.davem@davemloft.net>
On Wed, 2016-05-04 at 12:50 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@gmail.com>
> Date: Wed, 04 May 2016 07:27:06 -0700
>
> > kernel was fine, and most user land apps were fine as well.
>
> Userland should really not have to deal with garbage like this.
>
> And because it quietly works just fine on x86-64, nothing makes
> sure that applications will universally get this right anyways.
>
> Better to align things properly and magically all of these issues
> simply disappear.
Sure, but in practice we end up consuming 16 bytes (instead of 12) per
u64 attribute, only on some arches. 33 % space overhead.
So maybe some dumps will abort on those arches, while on x86 the size of
skb might be below some magic limit.
I guess this is fine, we do not break ABI in any way.
next prev parent reply other threads:[~2016-05-04 17:13 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 8:06 [PATCH net-next 0/8] netlink: align attributes when needed (patchset #3) Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 1/8] macsec: use nla_put_u64_64bit() Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 2/8] drivers/wireless: " Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 3/8] fs/quota: " Nicolas Dichtel
2016-04-26 11:08 ` Jan Kara
2016-04-26 12:31 ` Nicolas Dichtel
2016-04-26 12:37 ` Jan Kara
2016-04-26 16:24 ` David Miller
2016-04-26 8:06 ` [PATCH net-next 4/8] sock_diag: align nlattr properly when needed Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 5/8] ovs: " Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 6/8] rtnl: " Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 7/8] neigh: " Nicolas Dichtel
2016-04-26 8:06 ` [PATCH net-next 8/8] sched: " Nicolas Dichtel
2016-04-26 11:54 ` [PATCH net-next 0/8] netlink: align attributes when needed (patchset #3) Lars Ellenberg
2016-04-26 12:18 ` [Drbd-dev] " Lars Ellenberg
2016-05-03 8:50 ` [PATCH net-next] block/drbd: use nla_put_u64_64bit() Nicolas Dichtel
2016-05-03 9:28 ` Nicolas Dichtel
2016-05-03 9:39 ` [PATCH net-next v2] " Nicolas Dichtel
2016-05-03 10:06 ` Lars Ellenberg
2016-05-03 12:07 ` Nicolas Dichtel
2016-05-03 16:05 ` David Miller
2016-05-04 9:05 ` Lars Ellenberg
2016-05-04 12:49 ` Nicolas Dichtel
2016-05-04 12:52 ` [Drbd-dev] " Lars Ellenberg
2016-05-04 14:27 ` Eric Dumazet
2016-05-04 16:50 ` David Miller
2016-05-04 17:13 ` Eric Dumazet [this message]
2016-05-04 16:47 ` David Miller
2016-05-03 16:06 ` David Miller
2016-05-09 9:40 ` [PATCH net-next v3] block/drbd: align properly u64 in nl messages Nicolas Dichtel
2016-05-09 13:15 ` Lars Ellenberg
2016-05-10 9:09 ` Nicolas Dichtel
2016-05-10 9:40 ` [Drbd-dev] " Lars Ellenberg
2016-05-10 10:06 ` Nicolas Dichtel
2016-05-10 15:39 ` David Miller
2016-05-10 19:09 ` Lars Ellenberg
2016-05-10 19:26 ` David Miller
2016-04-26 16:25 ` [PATCH net-next 0/8] netlink: align attributes when needed (patchset #3) David Miller
2016-04-26 16:02 ` David Miller
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