From: David Ahern <dsahern@gmail.com>
To: Serhey Popovych <serhe.popovych@gmail.com>, netdev@vger.kernel.org
Subject: Re: [PATCH iproute2-next v3 5/8] veth,vxcan: Save/reinitialize/restore whole @struct ifinfomsg
Date: Sun, 25 Feb 2018 20:28:14 -0700 [thread overview]
Message-ID: <21860aaf-41a1-4a40-2f5f-01fc5ae033ea@gmail.com> (raw)
In-Reply-To: <1519304526-18848-6-git-send-email-serhe.popovych@gmail.com>
On 2/22/18 6:02 AM, Serhey Popovych wrote:
> Now in iplink_parse() we use ->ifi_change and ->ifi_flags fields and
> plan to use ->ifi_index with upcoming change.
>
> Saving, restoring and reinitializing individual fields is error prone:
> using new field in iplink_parse() without updating callers in veth and
> vxcan will overwrite main device ifinfomsg data.
>
> Since @struct ifinfomsg is small enough with known sizeof() compiler may
> inline memcpy()/memset() with few load/store instructions.
>
> Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
> ---
> ip/iplink_vxcan.c | 22 ++++++++--------------
> ip/link_veth.c | 22 ++++++++--------------
> 2 files changed, 16 insertions(+), 28 deletions(-)
I don't agree that this change has any benefit. Only the flags and
change field are wanted; there is no need to save the entire struct,
next prev parent reply other threads:[~2018-02-26 3:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-22 13:01 [PATCH iproute2-next v3 0/8] iplink: Improve iplink_parse() Serhey Popovych
2018-02-22 13:01 ` [PATCH iproute2-next v3 1/8] utils: Introduce and use nodev() helper routine Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 2/8] iplink: Correctly report error when network device isn't found Serhey Popovych
2018-02-23 23:41 ` David Ahern
2018-02-25 12:07 ` Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 3/8] iplink: Use "dev" and "name" parameters interchangeable when possible Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 4/8] iplink: Follow documented behaviour when "index" is given Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 5/8] veth,vxcan: Save/reinitialize/restore whole @struct ifinfomsg Serhey Popovych
2018-02-26 3:28 ` David Ahern [this message]
2018-02-26 15:48 ` Serhey Popovych
2018-02-26 15:57 ` Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 6/8] iplink: Perform most of request buffer setups and checks in iplink_parse() Serhey Popovych
2018-02-26 3:31 ` David Ahern
2018-02-26 15:51 ` Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 7/8] iplink: Move data structures to block of their users Serhey Popovych
2018-02-22 13:02 ` [PATCH iproute2-next v3 8/8] iplink: Reduce number of arguments to iplink_parse() Serhey Popovych
2018-02-26 3:35 ` David Ahern
2018-02-26 15:44 ` Serhey Popovych
2018-02-26 16:07 ` Serhey Popovych
2018-02-26 18:06 ` Stephen Hemminger
2018-02-26 18:20 ` Serhey Popovych
2018-02-26 18:27 ` David Ahern
2018-02-26 18:38 ` Serhey Popovych
2018-02-26 20:09 ` Serhey Popovych
2018-02-26 21:35 ` Stephen Hemminger
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