s390/bpf: Use direct calls and jumps where possible #9486
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After the V!=R rework (commit c98d2ec ("s390/mm: Uncouple physical vs virtual address spaces")), all kernel code and related data are allocated within a 4G region, making it possible to use relative addressing in BPF code more extensively. Convert as many indirect calls and jumps to direct calls as possible, namely: * BPF_CALL * __bpf_tramp_enter() * __bpf_tramp_exit() * __bpf_prog_enter() * __bpf_prog_exit() * fentry * fmod_ret * fexit * BPF_TRAMP_F_CALL_ORIG without BPF_TRAMP_F_ORIG_STACK * Trampoline returns without BPF_TRAMP_F_SKIP_FRAME and BPF_TRAMP_F_ORIG_STACK The following indirect calls and jumps remain: * Prog returns * Trampoline returns with BPF_TRAMP_F_SKIP_FRAME or BPF_TRAMP_F_ORIG_STACK * BPF_TAIL_CALL * BPF_TRAMP_F_CALL_ORIG with BPF_TRAMP_F_ORIG_STACK As a result, only one usage of call_r1() remains, so inline it. Signed-off-by: Ilya Leoshkevich <[email protected]>
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Pull request for series with
subject: s390/bpf: Use direct calls and jumps where possible
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=991502