linux-kernel - Re: [PATCH 5/5] MIPS: Add support for eBPF JIT.

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Message-ID: <201705270158.SmCU1rJu%fengguang.wu@intel.com>
Date:   Sat, 27 May 2017 01:12:17 +0800
From:   kbuild test robot <lkp@...el.com>
To:     David Daney <david.daney@...ium.com>
Cc:     kbuild-all@...org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        ralf@...ux-mips.org, Markos Chandras <markos.chandras@...tec.com>,
        David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 5/5] MIPS: Add support for eBPF JIT.

Hi David,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc2]
[cannot apply to next-20170526]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/David-Daney/MIPS-Implement-eBPF-JIT/20170526-124316
config: mips-allmodconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

   arch/mips/net/bpf_jit.c: In function 'build_one_insn':
>> arch/mips/net/bpf_jit.c:2276:27: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
      t64s = (s64)insn->imm + (s64)__bpf_call_base;
                              ^
   arch/mips/net/bpf_jit.c:2293:38: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
       emit_const_to_reg(ctx, MIPS_R_T9, (u64)bpf_internal_load_pointer_neg_helper);
                                         ^
   arch/mips/net/bpf_jit.c:2295:38: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
       emit_const_to_reg(ctx, MIPS_R_T9, (u64)ool_skb_header_pointer);
                                         ^
   arch/mips/net/bpf_jit.c:2325:37: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
      emit_const_to_reg(ctx, MIPS_R_T8, (u64)bpf_internal_load_pointer_neg_helper);
                                        ^
   arch/mips/net/bpf_jit.c:2326:37: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
      emit_const_to_reg(ctx, MIPS_R_T9, (u64)ool_skb_header_pointer);
                                        ^
   cc1: all warnings being treated as errors

vim +2276 arch/mips/net/bpf_jit.c

  2270			t64 = ((u64)(u32)insn->imm) | ((u64)(insn + 1)->imm << 32);
  2271			emit_const_to_reg(ctx, dst, t64);
  2272			return 2; /* Double slot insn */
  2273	
  2274		case BPF_JMP | BPF_CALL:
  2275			ctx->flags |= EBPF_SAVE_RA;
> 2276			t64s = (s64)insn->imm + (s64)__bpf_call_base;
  2277			emit_const_to_reg(ctx, MIPS_R_T9, (u64)t64s);
  2278			emit_jalr(MIPS_R_RA, MIPS_R_T9, ctx);
  2279			/* delay slot */

---
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