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SubjectRe: [PATCH bpf-next v2] bpf: remove set but not used variable 'dst_known'
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> On Apr 17, 2020, at 6:37 PM, Mao Wenan <maowenan@huawei.com> wrote:
>
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> kernel/bpf/verifier.c:5603:18: warning: variable ‘dst_known’
> set but not used [-Wunused-but-set-variable], delete this
> variable.
>
> Signed-off-by: Mao Wenan <maowenan@huawei.com>

Acked-by: Song Liu <songliubraving@fb.com>

With one nit below.

> ---
> v2: remove fixes tag in commit log.
> kernel/bpf/verifier.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 04c6630cc18f..c9f50969a689 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -5600,7 +5600,7 @@ static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
> {
> struct bpf_reg_state *regs = cur_regs(env);
> u8 opcode = BPF_OP(insn->code);
> - bool src_known, dst_known;
> + bool src_known;

This is not a hard rule, but we prefer to keep variable definition in
"reverse Christmas tree" order. Since we are on this function, let's
reorder these definitions to something like:

u64 insn_bitness = (BPF_CLASS(insn->code) == BPF_ALU64) ? 64 : 32;
struct bpf_reg_state *regs = cur_regs(env);
u8 opcode = BPF_OP(insn->code);
u32 dst = insn->dst_reg;
s64 smin_val, smax_val;
u64 umin_val, umax_val;
bool src_known;
int ret;

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