bpf, arm64: Remove unused-but-set function and variable.

Remove unused-but-set function and variable to fix the build warning:
   arch/arm64/net/bpf_jit_comp.c: In function 'arch_bpf_trampoline_size':
    2547 |  int nregs, ret;
         |      ^~~~~

Fixes: 9014cf56f13d ("bpf, arm64: Support up to 12 function arguments")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/bpf/20250528002704.21197-1-alexei.starovoitov@gmail.com
Closes: https://lore.kernel.org/oe-kbuild-all/202505280643.h0qYcSCM-lkp@intel.com/

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index b5c3ab6..14d4c6a 100644 (file)
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -2520,21 +2520,6 @@ static int prepare_trampoline(struct jit_ctx *ctx, struct bpf_tramp_image *im,
        return ctx->idx;
 }
 
-static int btf_func_model_nregs(const struct btf_func_model *m)
-{
-       int nregs = m->nr_args;
-       int i;
-
-       /* extra registers needed for struct argument */
-       for (i = 0; i < MAX_BPF_FUNC_ARGS; i++) {
-               /* The arg_size is at most 16 bytes, enforced by the verifier. */
-               if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG)
-                       nregs += (m->arg_size[i] + 7) / 8 - 1;
-       }
-
-       return nregs;
-}
-
 int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
                             struct bpf_tramp_links *tlinks, void *func_addr)
 {
@@ -2543,10 +2528,8 @@ int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
                .idx = 0,
        };
        struct bpf_tramp_image im;
-       struct arg_aux  aaux;
-       int nregs, ret;
-
-       nregs = btf_func_model_nregs(m);
+       struct arg_aux aaux;
+       int ret;
 
        ret = calc_arg_aux(m, &aaux);
        if (ret < 0)