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Pull xtensa updates from Max Filippov: - use generic spinlock/rwlock implementations - clean up IPI processing - document boot parameters passing to the kernel - fix get_wchan - various cleanups in time.c, process.c, traps.c and thread_info.h * tag 'xtensa-20190307' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: simplify trap_init xtensa: drop unused definitions xtensa: fix get_wchan xtensa: use generic spinlock/rwlock implementation xtensa: provide xchg for sizes 1 and 2 xtensa: clean up arch/xtensa/kernel/time.c xtensa: SMP: rework IPI processing xtensa: document boot parameter passing