riscv: cmpxchg: Remove unnecessary definitions of cmpxchg & xchg
The custom xchg/cmpxchg_release macro definitions have no difference from the common code from the binary view. The xchg32/64 macro definitions have been abandoned in Linux. Thus, remove all of them. This is a preparation for the next cmpxchg_small & xchg8 patches. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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