On Fri, 1 Jul 2022 16:24:33 +0800, Xiu Jianfeng wrote:

This patchset adds support for syscall stack randomization for
powerpc, which can make harder the various stack-based attacks that
rely on deterministic stack structure.

Changes in v3:
  -add a lead-up patch to move system_call_exception() to syscall.c to
  avoid disabling stack protector for all functions in interrupt.c
Changes in v2:
  -move choose choose_random_kstack_offset() to the end of system_call_exception
  -allow full 6 (10) bits of entropy
  -disable stack-protector for interrupt.c

[...]

Applied to powerpc/next.

[1/2] powerpc: Move system_call_exception() to syscall.c
      https://git.kernel.org/powerpc/c/1547db7d1f4481c1f3ec731f3edc724ef3026ede
[2/2] powerpc: add support for syscall stack randomization
      https://git.kernel.org/powerpc/c/f4a0318f278d98d9492916722e85f258c2221f88

cheers