riscv: atomic: Optimize dec_if_positive functions

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Current implementation wastes another register to pass the
argument, but we only need addi to calculate the result. Optimize
the code with minimize the usage of registers.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20220505035526.2974382-3-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Guo Ren 2022-05-05 11:55:23 +08:00 • committed by Palmer Dabbelt

parent dd8437cd42

commit 1d7f6932c5

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arch/riscv/include/asm/atomic.h

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