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The SK_BUSY bit in svc_sock->sk_flags ensures that we do not attempt to enqueue a socket twice. Currently, setting and clearing the bit is protected by svc_serv->sv_lock. As I intend to reduce the data that the lock protects so it's not held when svc_sock_enqueue() tests and sets SK_BUSY, that test and set needs to be atomic. Signed-off-by: Greg Banks <gnb@melbourne.sgi.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>