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| author |   Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2021-11-23 05:27:33 +0530 |
|---|---|---|
| committer |   Andrii Nakryiko <andrii@kernel.org> | 2021-11-30 15:48:15 -0800 |
| commit | d995816b77eb826e0f6d7adf4471ec191b362be0 (patch) | |
| tree | f9e3218358a518f12f76acc5765fd6af95ef4cbd /tools/lib/bpf/gen_loader.c | |
| parent | libbpf: Avoid double stores for success/failure case of ksym relocations (diff) | |
| download | linux-dev-d995816b77eb826e0f6d7adf4471ec191b362be0.tar.xz linux-dev-d995816b77eb826e0f6d7adf4471ec191b362be0.zip | |
libbpf: Avoid reload of imm for weak, unresolved, repeating ksym
Alexei pointed out that we can use BPF_REG_0 which already contains imm
from move_blob2blob computation. Note that we now compare the second
insn's imm, but this should not matter, since both will be zeroed out
for the error case for the insn populated earlier.
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20211122235733.634914-4-memxor@gmail.com
Diffstat (limited to '')
| -rw-r--r-- | tools/lib/bpf/gen_loader.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c index 5a2d6bf041dd..6f3790369463 100644 --- a/tools/lib/bpf/gen_loader.c +++ b/tools/lib/bpf/gen_loader.c @@ -795,9 +795,8 @@ static void emit_relo_ksym_btf(struct bpf_gen *gen, struct ksym_relo_desc *relo, kdesc->insn + offsetof(struct bpf_insn, imm)); move_blob2blob(gen, insn + sizeof(struct bpf_insn) + offsetof(struct bpf_insn, imm), 4, kdesc->insn + sizeof(struct bpf_insn) + offsetof(struct bpf_insn, imm)); - emit(gen, BPF_LDX_MEM(BPF_W, BPF_REG_9, BPF_REG_8, offsetof(struct bpf_insn, imm))); - /* jump over src_reg adjustment if imm is not 0 */ - emit(gen, BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 0, 3)); + /* jump over src_reg adjustment if imm is not 0, reuse BPF_REG_0 from move_blob2blob */ + emit(gen, BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 3)); goto clear_src_reg; } /* remember insn offset, so we can copy BTF ID and FD later */ |