[avpatel:riscv_acpi_apei_v1 35/55] arch/riscv/kernel/hw_breakpoint.c:109:9: warning: variable 'rc' is uninitialized when used here

[avpatel:riscv_acpi_apei_v1 35/55] arch/riscv/kernel/hw_breakpoint.c:109:9: warning: variable 'rc' is uninitialized when used here

[kernel test robot]

tree:   https://github.com/avpatel/linux.git riscv_acpi_apei_v1
head:   eaca137f211dcb260f7eb52d983ddad7f27277f3
commit: df85c5a81bf62ede57ad6bdfa14482907dee11cf [35/55] riscv: Introduce support for hardware break/watchpoints
config: riscv-randconfig-002-20250811 (https://download.01.org/0day-ci/archive/20250811/202508111923.YBAEfI8R-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 3769ce013be2879bf0b329c14a16f5cb766f26ce)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250811/202508111923.YBAEfI8R-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508111923.YBAEfI8R-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/hw_breakpoint.c:109:9: warning: variable 'rc' is uninitialized when used here [-Wuninitialized]
     109 |         return rc;
         |                ^~
   arch/riscv/kernel/hw_breakpoint.c:90:8: note: initialize the variable 'rc' to silence this warning
      90 |         int rc;
         |               ^
         |                = 0
   1 warning generated.


vim +/rc +109 arch/riscv/kernel/hw_breakpoint.c

    84	
    85	static int arch_smp_setup_sbi_shmem(unsigned int cpu)
    86	{
    87		union sbi_dbtr_shmem_entry *dbtr_shmem;
    88		unsigned long shmem_pa;
    89		struct sbiret ret;
    90		int rc;
    91	
    92		dbtr_shmem = per_cpu_ptr(&sbi_dbtr_shmem, cpu);
    93		if (!dbtr_shmem) {
    94			pr_err("Invalid per-cpu shared memory for debug triggers\n");
    95			return -ENODEV;
    96		}
    97	
    98		shmem_pa = virt_to_phys(dbtr_shmem);
    99	
   100		ret = sbi_ecall(SBI_EXT_DBTR, SBI_EXT_DBTR_SETUP_SHMEM,
   101				SBI_SHMEM_LO(shmem_pa), SBI_SHMEM_HI(shmem_pa), 0, 0, 0, 0);
   102		if (ret.error) {
   103			pr_warn("%s: failed to setup shared memory. error: %ld\n", __func__, ret.error);
   104			return sbi_err_map_linux_errno(ret.error);
   105		}
   106	
   107		pr_debug("CPU %d: HW Breakpoint shared memory registered.\n", cpu);
   108	
 > 109		return rc;
   110	}
   111	

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https://github.com/intel/lkp-tests/wiki