On Tue, 21 Sep 2021 17:09:47 +0200, Christophe Leroy wrote:

Today we get the following code generation for bitops like
set or clear bit:

	c0009fe0:	39 40 08 00 	li      r10,2048
	c0009fe4:	7c e0 40 28 	lwarx   r7,0,r8
	c0009fe8:	7c e7 53 78 	or      r7,r7,r10
	c0009fec:	7c e0 41 2d 	stwcx.  r7,0,r8

[...]

Applied to powerpc/next.

[1/3] powerpc/bitops: Use immediate operand when possible
      https://git.kernel.org/powerpc/c/fb350784d8d17952afa93383bb47aaa6b715c459
[2/3] powerpc/atomics: Use immediate operand when possible
      https://git.kernel.org/powerpc/c/41d65207de9fbff58acd8937a7c3f8940c186a87
[3/3] powerpc/atomics: Remove atomic_inc()/atomic_dec() and friends
      https://git.kernel.org/powerpc/c/f05cab0034babaa9b3dfaf6003ee6493496a8180

cheers