linux-kernel - arch/csky/kernel/probes/decode-insn.c:19:31: sparse: sparse: cast to restricted _

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Date:   Thu, 29 Apr 2021 22:58:17 +0800
From:   kernel test robot <lkp@...el.com>
To:     Julian Braha <julianbraha@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: arch/csky/kernel/probes/decode-insn.c:19:31: sparse: sparse: cast to
 restricted __le32

Hi Julian,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d72cd4ad4174cfd2257c426ad51e4f53bcfde9c9
commit: 7d37cb2c912dc5c25ffac784a4f9b98c06c6bd08 lib: fix kconfig dependency on ARCH_WANT_FRAME_POINTERS
date:   3 weeks ago
config: csky-randconfig-s031-20210429 (attached as .config)
compiler: csky-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7d37cb2c912dc5c25ffac784a4f9b98c06c6bd08
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 7d37cb2c912dc5c25ffac784a4f9b98c06c6bd08
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=csky 

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/csky/kernel/probes/decode-insn.c:19:31: sparse: sparse: cast to restricted __le32
--
>> arch/csky/kernel/probes/kprobes.c:32:31: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned short [usertype] @@     got restricted __le16 [usertype] @@
   arch/csky/kernel/probes/kprobes.c:32:31: sparse:     expected unsigned short [usertype]
   arch/csky/kernel/probes/kprobes.c:32:31: sparse:     got restricted __le16 [usertype]
>> arch/csky/kernel/probes/kprobes.c:86:21: sparse: sparse: cast to restricted __le32

vim +19 arch/csky/kernel/probes/decode-insn.c

33e53ae1ce413a Guo Ren 2020-04-01  11  
33e53ae1ce413a Guo Ren 2020-04-01  12  /* Return:
33e53ae1ce413a Guo Ren 2020-04-01  13   *   INSN_REJECTED     If instruction is one not allowed to kprobe,
33e53ae1ce413a Guo Ren 2020-04-01  14   *   INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
33e53ae1ce413a Guo Ren 2020-04-01  15   */
33e53ae1ce413a Guo Ren 2020-04-01  16  enum probe_insn __kprobes
33e53ae1ce413a Guo Ren 2020-04-01  17  csky_probe_decode_insn(probe_opcode_t *addr, struct arch_probe_insn *api)
33e53ae1ce413a Guo Ren 2020-04-01  18  {
33e53ae1ce413a Guo Ren 2020-04-01 @19  	probe_opcode_t insn = le32_to_cpu(*addr);

:::::: The code at line 19 was first introduced by commit
:::::: 33e53ae1ce413a081254e686d9b27cc1b3585e2f csky: Add kprobes supported

:::::: TO: Guo Ren <guoren@...ux.alibaba.com>
:::::: CC: Guo Ren <guoren@...ux.alibaba.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (29423 bytes)