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Date: Sat, 11 Jul 2020 11:13:54 +0800
From: kernel test robot <lkp@...el.com>
To: Tobias Klauser <tklauser@...tanz.ch>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Wang YanQing <udknight@...il.com>
Cc: kbuild-all@...ts.01.org, bpf@...r.kernel.org,
netdev@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH bpf-next 1/2] bpf, x86: Factor common x86 JIT code
Hi Tobias,
I love your patch! Perhaps something to improve:
[auto build test WARNING on bpf-next/master]
url: https://github.com/0day-ci/linux/commits/Tobias-Klauser/bpf-x86-Factor-common-x86-JIT-code/20200630-045932
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-s022-20200710 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.2-37-gc9676a3b-dirty
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (e58948 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (e58948 becomes 8948)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (ec8148 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (ec8148 becomes 8148)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5541 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5641 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5741 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (d289 becomes 89)
>> arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (1c5639 becomes 39)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (1c5639 becomes 5639)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (2b76 becomes 76)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (858b becomes 8b)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (fffffddc becomes dc)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (20f883 becomes 83)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (20f883 becomes f883)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (2077 becomes 77)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (1c083 becomes 83)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (1c083 becomes c083)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (8589 becomes 89)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (fffffddc becomes dc)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (d6848b48 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (d6848b48 becomes 8b48)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (190 becomes 90)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c08548 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (c08548 becomes 8548)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (a74 becomes 74)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (30408b48 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (30408b48 becomes 8b48)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (19c08348 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (19c08348 becomes 8348)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (e0ff becomes ff)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (858b becomes 8b)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (fffffddc becomes dc)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (20f883 becomes 83)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (20f883 becomes f883)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (e77 becomes 77)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (1c083 becomes 83)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (1c083 becomes c083)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (8589 becomes 89)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (fffffddc becomes dc)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (8966 becomes 66)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c3c749 becomes 49)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (c3c749 becomes c749)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (d231 becomes 31)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (f3f749 becomes 49)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (f3f749 becomes f749)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (f3f741 becomes 41)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (f3f741 becomes f741)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (d38949 becomes 49)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (d38949 becomes 8949)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c38949 becomes 49)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (c38949 becomes 8949)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (b70f45 becomes 45)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (b70f45 becomes f45)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (b70f becomes f)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (f41 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (b70f45 becomes 45)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (b70f45 becomes f45)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (b70f becomes f)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c641 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c74166 becomes 66)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (c74166 becomes 4166)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c766 becomes 66)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (c741 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (1f0 becomes f0)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5f41 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5e41 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (5d41 becomes 41)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (f87d8348 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (f87d8348 becomes 8348)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (e58948 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (e58948 becomes 8948)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (8c48348 becomes 48)
arch/x86/net/bpf_jit.h:15:31: sparse: sparse: cast truncates bits from constant value (8c48348 becomes 8348)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (e2ff becomes ff)
arch/x86/net/bpf_jit.h:13:24: sparse: sparse: cast truncates bits from constant value (8f0f becomes f)
vim +13 arch/x86/net/bpf_jit.h
9
10 static inline u8 *emit_code(u8 *ptr, u32 bytes, unsigned int len)
11 {
12 if (len == 1)
> 13 *ptr = bytes;
14 else if (len == 2)
15 *(u16 *)ptr = bytes;
16 else {
17 *(u32 *)ptr = bytes;
18 barrier();
19 }
20 return ptr + len;
21 }
22
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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