From: Thomas Graf <tgraf@suug.ch>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kcc@google.com, andreyknvl@google.com, glider@google.com,
ktsan@googlegroups.com, paulmck@linux.vnet.ibm.com
Subject: Re: [PATCH] lib: fix data race in rhashtable_rehash_one
Date: Tue, 22 Sep 2015 10:19:58 +0200 [thread overview]
Message-ID: <20150922081958.GC13047@pox.localdomain> (raw)
In-Reply-To: <1442876618.29850.64.camel@edumazet-glaptop2.roam.corp.google.com>
On 09/21/15 at 04:03pm, Eric Dumazet wrote:
> What I said is :
>
> In @head you already have the correct nulls value, from hash table.
>
> You do not need to recompute this value, and/or test if hash table chain
> is empty.
>
> If hash bucket is empty, it contains the appropriate NULLS value.
>
> If you are paranoiac add this debugging check :
>
> if (rht_is_a_nulls(head))
> BUG_ON(head != (struct rhash_head *)rht_marker(ht, new_hash));
>
>
> Therefore, simply fix the bug and unnecessary code with :
You are absolutely right Eric. Do you want to revise your patch Dmitry?
Eric's proposed fix absolutely the best way to fix this.
next prev parent reply other threads:[~2015-09-22 8:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 8:08 [PATCH] lib: fix data race in rhashtable_rehash_one Dmitry Vyukov
2015-09-21 13:31 ` Eric Dumazet
2015-09-21 14:51 ` Eric Dumazet
2015-09-21 15:10 ` Dmitry Vyukov
2015-09-21 15:15 ` Eric Dumazet
2015-09-21 22:25 ` Thomas Graf
2015-09-21 23:03 ` Eric Dumazet
2015-09-22 8:19 ` Thomas Graf [this message]
2015-09-22 8:52 ` Dmitry Vyukov
2015-09-22 15:18 ` Herbert Xu
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=20150922081958.GC13047@pox.localdomain \
--to=tgraf@suug.ch \
--cc=andreyknvl@google.com \
--cc=dvyukov@google.com \
--cc=eric.dumazet@gmail.com \
--cc=glider@google.com \
--cc=kcc@google.com \
--cc=ktsan@googlegroups.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paulmck@linux.vnet.ibm.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).