linux-kernel - drivers/net/ethernet/mediatek/mtk_ppe_offload.c:89:19: sparse: sparse: cast to restricted _

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Date:   Sun, 12 Dec 2021 21:19:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Felix Fietkau <nbd@....name>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: drivers/net/ethernet/mediatek/mtk_ppe_offload.c:89:19: sparse:
 sparse: cast to restricted __be32

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a763d5a5abd65797aec3dd1bf01fe2ccbec32967
commit: 502e84e2382d92654a2ecbc52cdbdb5a11cdcec7 net: ethernet: mtk_eth_soc: add flow offloading support
date:   9 months ago
config: arm-allyesconfig (https://download.01.org/0day-ci/archive/20211212/202112122115.CHN71eMT-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=502e84e2382d92654a2ecbc52cdbdb5a11cdcec7
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 502e84e2382d92654a2ecbc52cdbdb5a11cdcec7
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash drivers/dma/ drivers/gpu/drm/msm/ drivers/gpu/drm/tegra/ drivers/interconnect/qcom/ drivers/net/ethernet/mediatek/ drivers/net/vmxnet3/ drivers/net/wireless/mediatek/mt76/mt7915/ drivers/remoteproc/ drivers/scsi/bnx2fc/ drivers/scsi/lpfc/ drivers/staging/ fs/proc/

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 >>)
>> drivers/net/ethernet/mediatek/mtk_ppe_offload.c:89:19: sparse: sparse: cast to restricted __be32
>> drivers/net/ethernet/mediatek/mtk_ppe_offload.c:93:41: sparse: sparse: restricted __be32 degrades to integer
   drivers/net/ethernet/mediatek/mtk_ppe_offload.c:46:10: sparse: sparse: Initializer entry defined twice
   drivers/net/ethernet/mediatek/mtk_ppe_offload.c:47:10: sparse:   also defined here

vim +89 drivers/net/ethernet/mediatek/mtk_ppe_offload.c

    83	
    84	
    85	static int
    86	mtk_flow_mangle_ports(const struct flow_action_entry *act,
    87			      struct mtk_flow_data *data)
    88	{
  > 89		u32 val = ntohl(act->mangle.val);
    90	
    91		switch (act->mangle.offset) {
    92		case 0:
  > 93			if (act->mangle.mask == ~htonl(0xffff))
    94				data->dst_port = cpu_to_be16(val);
    95			else
    96				data->src_port = cpu_to_be16(val >> 16);
    97			break;
    98		case 2:
    99			data->dst_port = cpu_to_be16(val);
   100			break;
   101		default:
   102			return -EINVAL;
   103		}
   104	
   105		return 0;
   106	}
   107	

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