linux-kernel - [atishp04:isa_ext_support 3/4] arch/riscv/kernel/cpufeature.c:82:24: warning: address of array 'edata->dtprop' will always evaluate to 'true'

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Date:   Tue, 28 Dec 2021 03:19:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Atish Patra <atishp@...osinc.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Atish Patra <Atish.Patra@....com>, linux-kernel@...r.kernel.org
Subject: [atishp04:isa_ext_support 3/4] arch/riscv/kernel/cpufeature.c:82:24:
 warning: address of array 'edata->dtprop' will always evaluate to 'true'

tree:   https://github.com/atishp04/linux isa_ext_support
head:   cf2f3fa532aa7c672f681ca0685046c738bfb45f
commit: ae97a995345b68c472f3a904fc8fbefaa97ae26a [3/4] RISC-V: Provide a framework for parsing multi-letter ISA extensions
config: riscv-randconfig-c006-20211226 (https://download.01.org/0day-ci/archive/20211228/202112280309.fgjGevFd-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 0c553cc1af2e4c14100df6cf4a6fc91987e778e6)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/atishp04/linux/commit/ae97a995345b68c472f3a904fc8fbefaa97ae26a
        git remote add atishp04 https://github.com/atishp04/linux
        git fetch --no-tags atishp04 isa_ext_support
        git checkout ae97a995345b68c472f3a904fc8fbefaa97ae26a
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/cpufeature.c:82:24: warning: address of array 'edata->dtprop' will always evaluate to 'true' [-Wpointer-bool-conversion]
           if (!edata || !edata->dtprop)
                         ~~~~~~~~^~~~~~
   1 warning generated.


vim +82 arch/riscv/kernel/cpufeature.c

    76	
    77	int riscv_isa_ext_list_add(struct riscv_isa_ext_data *edata)
    78	{
    79		struct device_node *node, *enode;
    80		int eid;
    81	
  > 82		if (!edata || !edata->dtprop)
    83			return -EINVAL;
    84	
    85		node = of_find_node_by_path("/cpus");
    86		if (!node) {
    87			pr_err("No CPU information found in DT\n");
    88			return -ENOENT;
    89		}
    90	
    91		enode = of_get_child_by_name(node, "riscv,isa-ext");
    92		if (!enode) {
    93			pr_err("No riscv-isa-ext found in DT\n");
    94			return -ENOENT;
    95		}
    96	
    97		eid = edata->isa_ext_id;
    98		if (eid < RISCV_ISA_EXT_BASE || eid >= RISCV_ISA_EXT_MAX)
    99			return -EINVAL;
   100	
   101		if (!of_property_read_bool(enode, edata->dtprop)) {
   102			pr_err("The ISA extension %s is not present in DT\n", edata->dtprop);
   103			return -ENODEV;
   104		}
   105	
   106		/* Enable the extension id in the riscv_isa for easier probing */
   107		riscv_isa[0] |= 1 << eid;
   108		list_add(&edata->node, &riscv_isa_ext_list);
   109		pr_info("RISC-V ISA extension '%s' available\n", edata->uprop);
   110	
   111		return 0;
   112	}
   113	

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