alpha: Override READ_ONCE() with barriered implementation

2020-07-21T09:50:35Z

Rather then relying on the core code to use smp_read_barrier_depends() as part of the READ_ONCE() definition, instead override __READ_ONCE() in the Alpha code so that it generates the required mb() and then implement smp_load_acquire() using the new macro to avoid redundant back-to-back barriers from the generic implementation. Acked-by: Peter Zijlstra (Intel) Acked-by: Paul E. McKenney Signed-off-by: Will Deacon

kernel/arch/alpha/include/asm/rwonce.h, branch linux-rolling-stable

alpha: Override READ_ONCE() with barriered implementation