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author	Max Filippov <jcmvbkbc@gmail.com>
	Fri, 21 Dec 2018 01:18:12 +0000 (17:18 -0800)
committer	Max Filippov <jcmvbkbc@gmail.com>
	Tue, 7 May 2019 17:36:31 +0000 (10:36 -0700)
commit	f7c34874f04a80d6c39a32f08da2529e59602d3c
tree	a225ab153205701d24bee7423fc950a9009cb533	tree \| snapshot
parent	d065fcf12c21348cbc125460f75332f467518fb1	commit \| diff

xtensa: add exclusive atomics support

Implement atomic primitives using exclusive access opcodes available in
the recent xtensa cores.
Since l32ex/s32ex don't have any memory ordering guarantees don't define
__smp_mb__before_atomic/__smp_mb__after_atomic to make them use memw.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

This is a test repository.

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arch/xtensa/include/asm/atomic.h		diff \| blob \| history
arch/xtensa/include/asm/barrier.h		diff \| blob \| history
arch/xtensa/include/asm/bitops.h		diff \| blob \| history
arch/xtensa/include/asm/cmpxchg.h		diff \| blob \| history
arch/xtensa/include/asm/core.h		diff \| blob \| history
arch/xtensa/include/asm/futex.h		diff \| blob \| history
arch/xtensa/kernel/setup.c		diff \| blob \| history