summaryrefslogtreecommitdiff
path: root/include/linux/rcupdate.h
diff options
context:
space:
mode:
authorPeter Zijlstra <peterz@infradead.org>2015-05-27 04:39:36 +0300
committerRusty Russell <rusty@rustcorp.com.au>2015-05-28 05:02:05 +0300
commit0a04b0166929405cd833c1cc40f99e862b965ddc (patch)
treec108e2aee50ce533cef248c755e86d48c59a4ebf /include/linux/rcupdate.h
parent6695b92a60bc7160c92d6dc5b17cc79673017c2f (diff)
downloadlinux-0a04b0166929405cd833c1cc40f99e862b965ddc.tar.xz
rcu: Move lockless_dereference() out of rcupdate.h
I want to use lockless_dereference() from seqlock.h, which would mean including rcupdate.h from it, however rcupdate.h already includes seqlock.h. Avoid this by moving lockless_dereference() into compiler.h. This is somewhat tricky since it uses smp_read_barrier_depends() which isn't available there, but its a CPP macro so we can get away with it. The alternative would be moving it into asm/barrier.h, but that would be updating each arch (I can do if people feel that is more appropriate). Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h15
1 files changed, 0 insertions, 15 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 573a5afd5ed8..0356ad954ea5 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -650,21 +650,6 @@ static inline void rcu_preempt_sleep_check(void)
#define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
/**
- * lockless_dereference() - safely load a pointer for later dereference
- * @p: The pointer to load
- *
- * Similar to rcu_dereference(), but for situations where the pointed-to
- * object's lifetime is managed by something other than RCU. That
- * "something other" might be reference counting or simple immortality.
- */
-#define lockless_dereference(p) \
-({ \
- typeof(p) _________p1 = ACCESS_ONCE(p); \
- smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
- (_________p1); \
-})
-
-/**
* rcu_assign_pointer() - assign to RCU-protected pointer
* @p: pointer to assign to
* @v: value to assign (publish)