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powerpc64/bpf: Avoid tailcall restore from trampoline

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Back propagation of tailcall count is no longer needed for
powerpc64 due to use of reference, which updates the tailcall
count in the tail_call_info field in the frame of the main
program only.

Back propagation is still required for 32-bit powerpc.

Signed-off-by: Abhishek Dubey <adubey@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260124075223.6033-4-adubey@linux.ibm.com
This commit is contained in:
Abhishek Dubey
2026-01-24 13:22:20 +05:30
committed by Madhavan Srinivasan
parent 2ed2d8f6fb
commit 88cb7f4034
1 changed files with 5 additions and 8 deletions
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13
arch/powerpc/net/bpf_jit_comp.c
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@@ -676,14 +676,11 @@ static void bpf_trampoline_setup_tail_call_info(u32 *image, struct codegen_conte
static void bpf_trampoline_restore_tail_call_cnt(u32 *image, struct codegen_context *ctx,
int func_frame_offset, int r4_off)
{
if (IS_ENABLED(CONFIG_PPC64)) {
/* See bpf_jit_stack_tailcallcnt() */
int tailcallcnt_offset = BPF_PPC_TAILCALL;
EMIT(PPC_RAW_LL(_R3, _R1, -tailcallcnt_offset));
EMIT(PPC_RAW_STL(_R3, _R1, func_frame_offset - tailcallcnt_offset));
} else {
/* See bpf_jit_stack_offsetof() and BPF_PPC_TC */
if (IS_ENABLED(CONFIG_PPC32)) {
/*
* Restore tailcall for 32-bit powerpc
* See bpf_jit_stack_offsetof() and BPF_PPC_TC
*/
EMIT(PPC_RAW_STL(_R4, _R1, r4_off));
}
}