Jeff Layton <jlay...@redhat.com> wrote: > > + if (cmpxchg(&inode->i_acl, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) > > + /* fall through */ ; > > + > > So you do the same thing regardless of the outcome of the above? Why > bother with the if at all here? Just do the cmpxchg and toss out the > result.
gcc might complain if you don't check the result. However, this does look like it's subject to a thundering herd problem. If 30000 processes all look at the ACL at the same time on a network fs, could that cause 30000 RPC calls to be transmitted for the same thing? David
