#definesmp_wmb() RISCV_FENCE(w,w) /* * This is a very specific barrier: it's currently only used in two places in * the kernel, both in the scheduler. See include/linux/spinlock.h for the two * orderings it guarantees, but the "critical section is RCsc" guarantee ...
这样可以确保多个处理器之间的数据操作是一致的,避免出现数据不一致的情况。 除了smp_rmb()函数外,Linux内核还提供了其他类似的内存屏障函数,如smp_wmb()和smp_mb()等。这些函数在不同场合下用于确保内存操作的顺序性和一致性,从而保证多处理器系统的稳定性和性能。 总的来说,smp_rmb()函数在Linux内核中起着至...