On Wed, Dec 12, 2018 at 05:08:45AM -0800, Eric Dumazet wrote: > > It is _not_ faster. > > Just different ways to do the exact same thing. > > For some reason you missed this two years old commit : > > > commit 3a37f7275cda5ad25c1fe9be8f20c76c60d175fa > Author: Paul E. McKenney <paul...@linux.vnet.ibm.com> > Date: Sun May 1 18:46:54 2016 -0700 > > rcu: No ordering for rcu_assign_pointer() of NULL > > This commit does a compile-time check for rcu_assign_pointer() of NULL, > and uses WRITE_ONCE() rather than smp_store_release() in that case. > > Reported-by: Christoph Hellwig <h...@infradead.org> > Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Thanks for pointing this out. I guess the comments in include/linux/rcupdate.h may need some updating. Xiaozhou
