[PATCH bpf-next v1 4/7] bpf, powerpc64: Use resolved pointer for timed may_goto
From: Siddharth Chintamaneni <hidden>
Date: 2026-09-04 19:51:59
Also in:
bpf, linux-riscv, linux-s390
Subsystem:
bpf jit for powerpc (32-bit and 64-bit), bpf [general] (safe dynamic programs and tools), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Hari Bathini, Christophe Leroy, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Madhavan Srinivasan, Linus Torvalds
The timed may_goto fixup now passes the resolved counter pointer through
BPF_REG_AX instead of a stack offset.
Copy the pointer directly into the first argument register rather than
adding it to the BPF frame pointer again.
Fixes: b55b6b9ad76c ("powerpc64/bpf: Add powerpc64 JIT support for timed may_goto")
Reported-by: Jeremy Jean <redacted>
Link: https://lore.kernel.org/all/20260824213158.3755932-2-Jeremy.Jean@oss.cyber.gouv.fr/ (local)
Assisted-by: Copilot:gpt-5.6-sol
Signed-off-by: Siddharth Chintamaneni <redacted>
---
arch/powerpc/net/bpf_timed_may_goto.S | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/net/bpf_timed_may_goto.S b/arch/powerpc/net/bpf_timed_may_goto.S
index 84ecf6fa7f5d..d88825dd34fe 100644
--- a/arch/powerpc/net/bpf_timed_may_goto.S
+++ b/arch/powerpc/net/bpf_timed_may_goto.S@@ -8,7 +8,7 @@ * arch_bpf_timed_may_goto() trampoline for powerpc64 * * Custom BPF convention (verifier/JIT): - * - input: stack offset in BPF_REG_AX (r12) + * - input: count and timestamp pointer in BPF_REG_AX (r12) * - output: updated count in BPF_REG_AX (r12) * * Call bpf_check_timed_may_goto(ptr) with normal powerpc64 ABI:
@@ -32,10 +32,10 @@ SYM_FUNC_START(arch_bpf_timed_may_goto) std r8, 72(r1) /* - * r3 = BPF_REG_FP + BPF_REG_AX - * BPF_REG_FP is r31; BPF_REG_AX is r12 (stack offset in bytes). + * BPF_REG_AX (r12) contains the count and timestamp pointer; pass it as + * the first argument in r3. */ - add r3, r31, r12 + mr r3, r12 bl CFUNC(bpf_check_timed_may_goto) /* Put return value back into AX */
--
2.43.0