[PATCH 4/4] riscv: Enable perf counters user access only through perf

[kernel test robot]

Hi Alexandre,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on acme/perf/core tip/master tip/auto-latest linus/master v6.3-rc6]
[cannot apply to next-20230413]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexandre-Ghiti/perf-Fix-wrong-comment-about-default-event_idx/20230414-002232
patch link:    https://lore.kernel.org/r/20230413161725.195417-5-alexghiti%40rivosinc.com
patch subject: [PATCH 4/4] riscv: Enable perf counters user access only through perf
config: riscv-randconfig-r036-20230412 (https://download.01.org/0day-ci/archive/20230414/202304140904.9oAVhFHu-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 9638da200e00bd069e6dd63604e14cbafede9324)
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/intel-lab-lkp/linux/commit/8ca9b21cbf2c0b91ee35356c01aef9da7d874e55
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Alexandre-Ghiti/perf-Fix-wrong-comment-about-default-event_idx/20230414-002232
        git checkout 8ca9b21cbf2c0b91ee35356c01aef9da7d874e55
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$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 where applicable
| Reported-by: kernel test robot <lkp at intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304140904.9oAVhFHu-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/perf_event.c:8:28: error: call to undeclared function 'to_riscv_pmu'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
                                     ^
>> arch/riscv/kernel/perf_event.c:8:20: error: incompatible integer to pointer conversion initializing 'struct riscv_pmu *' with an expression of type 'int' [-Wint-conversion]
           struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
                             ^       ~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/perf_event.c:24:27: error: incomplete definition of type 'struct riscv_pmu'
           userpg->pmc_width = rvpmu->ctr_get_width(event->hw.idx) + 1;
                               ~~~~~^
   arch/riscv/kernel/perf_event.c:8:9: note: forward declaration of 'struct riscv_pmu'
           struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
                  ^
   3 errors generated.


vim +/to_riscv_pmu +8 arch/riscv/kernel/perf_event.c

     4	
     5	void arch_perf_update_userpage(struct perf_event *event,
     6				       struct perf_event_mmap_page *userpg, u64 now)
     7	{
   > 8		struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
     9		struct clock_read_data *rd;
    10		unsigned int seq;
    11		u64 ns;
    12	
    13		userpg->cap_user_time = 0;
    14		userpg->cap_user_time_zero = 0;
    15		userpg->cap_user_time_short = 0;
    16		userpg->cap_user_rdpmc =
    17			!!(event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT);
    18	
    19		/*
    20		 * The counters are 64-bit but the priv spec doesn't mandate all the
    21		 * bits to be implemented: that's why, counter width can vary based on
    22		 * the cpu vendor.
    23		 */
  > 24		userpg->pmc_width = rvpmu->ctr_get_width(event->hw.idx) + 1;

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