From: Hauke Mehrtens <hauke@hauke-m.de>
To: backports@vger.kernel.org
Cc: johannes@sipsolutions.net, Hauke Mehrtens <hauke@hauke-m.de>
Subject: [PATCH 6/8] backports: rcupdate: Add rcu_replace_pointer
Date: Sun, 19 Apr 2020 19:10:37 +0200 [thread overview]
Message-ID: <20200419171039.17268-7-hauke@hauke-m.de> (raw)
In-Reply-To: <20200419171039.17268-1-hauke@hauke-m.de>
rcu_replace_pointer() was added in upstream commit a63fc6b75cca ("rcu:
Upgrade rcu_swap_protected() to rcu_replace_pointer()") and is now used
by the mt76 driver.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
backport/backport-include/linux/rcupdate.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/backport/backport-include/linux/rcupdate.h b/backport/backport-include/linux/rcupdate.h
index db501007..0bbfd615 100644
--- a/backport/backport-include/linux/rcupdate.h
+++ b/backport/backport-include/linux/rcupdate.h
@@ -77,4 +77,24 @@ rcu_head_after_call_rcu(struct rcu_head *rhp, rcu_callback_t f)
} while (0)
#endif
+#ifndef rcu_replace_pointer
+/**
+ * rcu_replace_pointer() - replace an RCU pointer, returning its old value
+ * @rcu_ptr: RCU pointer, whose old value is returned
+ * @ptr: regular pointer
+ * @c: the lockdep conditions under which the dereference will take place
+ *
+ * Perform a replacement, where @rcu_ptr is an RCU-annotated
+ * pointer and @c is the lockdep argument that is passed to the
+ * rcu_dereference_protected() call used to read that pointer. The old
+ * value of @rcu_ptr is returned, and @rcu_ptr is set to @ptr.
+ */
+#define rcu_replace_pointer(rcu_ptr, ptr, c) \
+({ \
+ typeof(ptr) __tmp = rcu_dereference_protected((rcu_ptr), (c)); \
+ rcu_assign_pointer((rcu_ptr), (ptr)); \
+ __tmp; \
+})
+#endif
+
#endif /* __BACKPORT_LINUX_RCUPDATE_H */
--
2.20.1
--
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next prev parent reply other threads:[~2020-04-19 17:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 17:10 [PATCH 0/8] backports: Update to version 5.6.5 Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 1/8] backports: add linux/units.h Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 2/8] backports: skbuff: add skb_list_walk_safe() and skb_mark_not_on_list() Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 3/8] backports: netlink: fix nla_validate_nested() Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 4/8] backports: patches: Refresh on kernel 5.6.5 Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 5/8] backports: patches: handle txqueue parameter in ndo_tx_timeout Hauke Mehrtens
2020-04-19 17:10 ` Hauke Mehrtens [this message]
2020-04-19 17:10 ` [PATCH 7/8] backports: fs: Adapt struct proc_ops Hauke Mehrtens
2020-04-19 17:10 ` [PATCH 8/8] patches: patches: Restrict MTU changes to struct net_device Hauke Mehrtens
2020-04-20 7:50 ` [PATCH 0/8] backports: Update to version 5.6.5 Johannes Berg
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