Re: [PATCH bpf-next 0/2] bpf, arm64: Simplify jited prologue/epilogue

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov [off-list ref]:

On Mon, 26 Aug 2024 15:16:22 +0800 you wrote:

From: Xu Kuohai <redacted>

The arm64 jit blindly saves/restores all callee-saved registers, making
the jited result looks a bit too compliated. For example, for an empty
prog, the jited result is:

   0:   bti jc
   4:   mov     x9, lr
   8:   nop
   c:   paciasp
  10:   stp     fp, lr, [sp, #-16]!
  14:   mov     fp, sp
  18:   stp     x19, x20, [sp, #-16]!
  1c:   stp     x21, x22, [sp, #-16]!
  20:   stp     x26, x25, [sp, #-16]!
  24:   mov     x26, #0
  28:   stp     x26, x25, [sp, #-16]!
  2c:   mov     x26, sp
  30:   stp     x27, x28, [sp, #-16]!
  34:   mov     x25, sp
  38:   bti j 		// tailcall target
  3c:   sub     sp, sp, #0
  40:   mov     x7, #0
  44:   add     sp, sp, #0
  48:   ldp     x27, x28, [sp], #16
  4c:   ldp     x26, x25, [sp], #16
  50:   ldp     x26, x25, [sp], #16
  54:   ldp     x21, x22, [sp], #16
  58:   ldp     x19, x20, [sp], #16
  5c:   ldp     fp, lr, [sp], #16
  60:   mov     x0, x7
  64:   autiasp
  68:   ret

[...]

Here is the summary with links:
  - [bpf-next,1/2] bpf, arm64: Get rid of fpb
    https://git.kernel.org/bpf/bpf-next/c/bd737fcb6485
  - [bpf-next,2/2] bpf, arm64: Avoid blindly saving/restoring all callee-saved registers
    https://git.kernel.org/bpf/bpf-next/c/5d4fa9ec5643

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html