[PATCH v3] riscv: Discard vector state on syscalls

[kernel test robot]

Hi Björn,

kernel test robot noticed the following build errors:

[auto build test ERROR on 488833ccdcac118da16701f4ee0673b20ba47fe3]

url:    https://github.com/intel-lab-lkp/linux/commits/Bj-rn-T-pel/riscv-Discard-vector-state-on-syscalls/20230629-142852
base:   488833ccdcac118da16701f4ee0673b20ba47fe3
patch link:    https://lore.kernel.org/r/20230629062730.985184-1-bjorn%40kernel.org
patch subject: [PATCH v3] riscv: Discard vector state on syscalls
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20230629/202306292011.OGfLGBam-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230629/202306292011.OGfLGBam-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306292011.OGfLGBam-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/riscv/kernel/traps.c: In function 'do_trap_ecall_u':
>> arch/riscv/kernel/traps.c:299:17: error: implicit declaration of function 'riscv_v_vstate_discard'; did you mean 'riscv_v_vstate_restore'? [-Werror=implicit-function-declaration]
     299 |                 riscv_v_vstate_discard(regs);
         |                 ^~~~~~~~~~~~~~~~~~~~~~
         |                 riscv_v_vstate_restore
   cc1: some warnings being treated as errors


vim +299 arch/riscv/kernel/traps.c

   290	
   291	asmlinkage __visible __trap_section void do_trap_ecall_u(struct pt_regs *regs)
   292	{
   293		if (user_mode(regs)) {
   294			ulong syscall = regs->a7;
   295	
   296			regs->epc += 4;
   297			regs->orig_a0 = regs->a0;
   298	
 > 299			riscv_v_vstate_discard(regs);
   300	
   301			syscall = syscall_enter_from_user_mode(regs, syscall);
   302	
   303			if (syscall < NR_syscalls)
   304				syscall_handler(regs, syscall);
   305			else
   306				regs->a0 = -ENOSYS;
   307	
   308			syscall_exit_to_user_mode(regs);
   309		} else {
   310			irqentry_state_t state = irqentry_nmi_enter(regs);
   311	
   312			do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->epc,
   313				"Oops - environment call from U-mode");
   314	
   315			irqentry_nmi_exit(regs, state);
   316		}
   317	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki