From: Josh Triplett <josht@linux.vnet.ibm.com>
To: paulmck@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, dipankar@in.ibm.com,
akpm@linux-foundation.org
Subject: Re: [PATCH] Immunize rcu_dereference() against crazy compiler writers
Date: Thu, 12 Jul 2007 09:08:20 -0700 [thread overview]
Message-ID: <1184256500.3000.1.camel@josh-work.beaverton.ibm.com> (raw)
In-Reply-To: <20070712010058.GA30869@linux.vnet.ibm.com>
On Wed, 2007-07-11 at 18:00 -0700, Paul E. McKenney wrote:
> Turns out that compiler writers are a bit more aggressive about optimizing
> than one might expect. This patch prevents a number of such optimizations
> from messing up rcu_deference(). This is not merely a theoretical
> problem, as evidenced by the rmb() in mce_log().
>
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Josh Triplett <josh@kernel.org>
- Josh Triplett
next prev parent reply other threads:[~2007-07-12 16:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-12 1:00 Paul E. McKenney
2007-07-12 1:03 ` [PATCH] Remove workaround for unimmunized rcu_dereference from mce_log() Paul E. McKenney
2007-07-12 14:03 ` [PATCH] Immunize rcu_dereference() against crazy compiler writers Andi Kleen
2007-07-12 14:49 ` Paul E. McKenney
2007-07-12 16:08 ` Josh Triplett [this message]
2007-07-17 9:46 ` Andrew Morton
2007-07-17 13:53 ` Paul E. McKenney
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=1184256500.3000.1.camel@josh-work.beaverton.ibm.com \
--to=josht@linux.vnet.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=dipankar@in.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--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
all inboxes | Powered by JetHome®