linux-kernel - drivers/perf/hisilicon/hisi_uncore_hha_pmu.c:89:7: warning: variable 'val' set but not used

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Date:   Thu, 3 Jun 2021 08:28:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Qi Liu <liuqi115@...wei.com>
Subject: drivers/perf/hisilicon/hisi_uncore_hha_pmu.c:89:7: warning: variable
 'val' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   324c92e5e0ee0e993bdb106fac407846ed677f6b
commit: 932f6a99f9b0c6b7039a5e2ce961009a8dc8c07c drivers/perf: hisi: Add new functions for HHA PMU
date:   10 weeks ago
config: arm64-randconfig-r005-20210603 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d8e0ae9a76a62bdc6117630d59bf9967ac9bb4ea)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=932f6a99f9b0c6b7039a5e2ce961009a8dc8c07c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 932f6a99f9b0c6b7039a5e2ce961009a8dc8c07c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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 >>):

   In file included from drivers/perf/hisilicon/hisi_uncore_hha_pmu.c:11:
   In file included from include/linux/acpi.h:35:
   In file included from include/acpi/acpi_io.h:7:
   In file included from arch/arm64/include/asm/acpi.h:12:
   include/linux/efi.h:1093:34: warning: passing 1-byte aligned argument to 4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer access [-Walign-mismatch]
           status = get_var(L"SecureBoot", &EFI_GLOBAL_VARIABLE_GUID, NULL, &size,
                                           ^
   include/linux/efi.h:1101:24: warning: passing 1-byte aligned argument to 4-byte aligned parameter 2 of 'get_var' may result in an unaligned pointer access [-Walign-mismatch]
           get_var(L"SetupMode", &EFI_GLOBAL_VARIABLE_GUID, NULL, &size, &setupmode);
                                 ^
>> drivers/perf/hisilicon/hisi_uncore_hha_pmu.c:89:7: warning: variable 'val' set but not used [-Wunused-but-set-variable]
                   u32 val;
                       ^
   drivers/perf/hisilicon/hisi_uncore_hha_pmu.c:103:7: warning: variable 'val' set but not used [-Wunused-but-set-variable]
                   u32 val;
                       ^
   4 warnings generated.


vim +/val +89 drivers/perf/hisilicon/hisi_uncore_hha_pmu.c

    82	
    83	static void hisi_hha_pmu_config_ds(struct perf_event *event)
    84	{
    85		struct hisi_pmu *hha_pmu = to_hisi_pmu(event->pmu);
    86		u32 ds_skt = hisi_get_datasrc_skt(event);
    87	
    88		if (ds_skt) {
  > 89			u32 val;
    90	
    91			val = readl(hha_pmu->base + HHA_DATSRC_CTRL);
    92			val |= HHA_DATSRC_SKT_EN;
    93			writel(ds_skt, hha_pmu->base + HHA_DATSRC_CTRL);
    94		}
    95	}
    96	

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

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