From: Jakub Kicinski <kuba@kernel.org>
To: Kuniyuki Iwashima <kuniyu@amazon.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>, <netdev@vger.kernel.org>,
Matthias Tafelmeier <matthias.tafelmeier@gmx.net>
Subject: Re: [PATCH v3 net 02/17] net: Fix data-races around weight_p and dev_weight_[rt]x_bias.
Date: Fri, 19 Aug 2022 17:03:01 -0700 [thread overview]
Message-ID: <20220819170301.43675f1a@kernel.org> (raw)
In-Reply-To: <20220818182653.38940-3-kuniyu@amazon.com>
On Thu, 18 Aug 2022 11:26:38 -0700 Kuniyuki Iwashima wrote:
> - dev_rx_weight = weight_p * dev_weight_rx_bias;
> - dev_tx_weight = weight_p * dev_weight_tx_bias;
> + WRITE_ONCE(dev_rx_weight,
> + READ_ONCE(weight_p) * READ_ONCE(dev_weight_rx_bias));
> + WRITE_ONCE(dev_tx_weight,
> + READ_ONCE(weight_p) * READ_ONCE(dev_weight_tx_bias));
Is there some locking on procfs writes? Otherwise one interrupted write
may get overtaken by another and we'll end up with inconsistent values.
OTOH if there is some locking we shouldn't have to protect weight_p
here.
next prev parent reply other threads:[~2022-08-20 0:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-18 18:26 [PATCH v3 net 00/17] net: sysctl: Fix data-races around net.core.XXX Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 01/17] net: Fix data-races around sysctl_[rw]mem_(max|default) Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 02/17] net: Fix data-races around weight_p and dev_weight_[rt]x_bias Kuniyuki Iwashima
2022-08-20 0:03 ` Jakub Kicinski [this message]
2022-08-22 18:30 ` Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 03/17] net: Fix data-races around netdev_max_backlog Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 04/17] net: Fix data-races around netdev_tstamp_prequeue Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 05/17] ratelimit: Fix data-races in ___ratelimit() Kuniyuki Iwashima
2022-08-20 0:04 ` Jakub Kicinski
2022-08-22 18:32 ` Kuniyuki Iwashima
2022-08-22 19:00 ` Eric Dumazet
2022-08-22 19:14 ` Kuniyuki Iwashima
2022-08-22 19:22 ` Eric Dumazet
2022-08-22 19:49 ` Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 06/17] net: Fix data-races around sysctl_optmem_max Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 07/17] net: Fix a data-race around sysctl_tstamp_allow_data Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 08/17] net: Fix a data-race around sysctl_net_busy_poll Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 09/17] net: Fix a data-race around sysctl_net_busy_read Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 10/17] net: Fix a data-race around netdev_budget Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 11/17] net: Fix data-races around sysctl_max_skb_frags Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 12/17] net: Fix a data-race around netdev_budget_usecs Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 13/17] net: Fix data-races around sysctl_fb_tunnels_only_for_init_net Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 14/17] net: Fix data-races around sysctl_devconf_inherit_init_net Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 15/17] net: Fix a data-race around gro_normal_batch Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 16/17] net: Fix a data-race around netdev_unregister_timeout_secs Kuniyuki Iwashima
2022-08-18 18:26 ` [PATCH v3 net 17/17] net: Fix a data-race around sysctl_somaxconn Kuniyuki Iwashima
2022-08-18 19:00 ` [PATCH v3 net 00/17] net: sysctl: Fix data-races around net.core.XXX Jakub Kicinski
2022-08-18 19:09 ` Kuniyuki Iwashima
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220819170301.43675f1a@kernel.org \
--to=kuba@kernel.org \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=kuni1840@gmail.com \
--cc=kuniyu@amazon.com \
--cc=matthias.tafelmeier@gmx.net \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).