Hi Paul, After merging the rcu tree, today's linux-next build (x86_64 allnoconfig) produced this warning:
kernel/cpu.c: In function 'boot_cpu_state_init': kernel/cpu.c:1778:6: warning: unused variable 'cpu' [-Wunused-variable] int cpu; ^ Introduced by commit faeb334286b7 ("rcu: Migrate callbacks earlier in the CPU-offline timeline") -- Cheers, Stephen Rothwell