From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>
Subject: [PATCH net-next-2.6 1/3] net: add rtnl_dereference()
Date: Wed, 15 Sep 2010 23:07:15 +0200 [thread overview]
Message-ID: <1284584835.2462.69.camel@edumazet-laptop> (raw)
We sometime want to dereference an rcu protected pointer while
holding RTNL. Use a macro to hide all lockdep details.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
include/linux/rtnetlink.h | 9 +++++++++
1 files changed, 9 insertions(+)
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 263690d..68c436b 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -760,6 +760,15 @@ extern int lockdep_rtnl_is_held(void);
rcu_dereference_check(p, rcu_read_lock_held() || \
lockdep_rtnl_is_held())
+/**
+ * rtnl_dereference - rcu_dereference with debug checking
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Do an rcu_dereference(p), but check caller holds RTNL
+ */
+#define rtnl_dereference(p) \
+ rcu_dereference_check(p, lockdep_rtnl_is_held())
+
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);
next reply other threads:[~2010-09-15 21:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-15 21:07 Eric Dumazet [this message]
2010-09-16 2:30 ` [PATCH net-next-2.6 1/3] net: add rtnl_dereference() David Miller
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=1284584835.2462.69.camel@edumazet-laptop \
--to=eric.dumazet@gmail.com \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
/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