[PATCH 6/7] riscv: report misaligned accesses emulation to hwprobe

[kernel test robot]

Hi Clément,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.6-rc3 next-20230928]
[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/Cl-ment-L-ger/riscv-remove-unused-functions-in-traps_misaligned-c/20230926-230654
base:   linus/master
patch link:    https://lore.kernel.org/r/20230926150316.1129648-7-cleger%40rivosinc.com
patch subject: [PATCH 6/7] riscv: report misaligned accesses emulation to hwprobe
config: riscv-randconfig-002-20230929 (https://download.01.org/0day-ci/archive/20230929/202309290842.Dk0K2nsp-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230929/202309290842.Dk0K2nsp-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/202309290842.Dk0K2nsp-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   arch/riscv/kernel/traps_misaligned.c: In function 'handle_misaligned_load':
   arch/riscv/kernel/traps_misaligned.c:420:48: error: 'struct thread_struct' has no member named 'align_ctl'
     420 |         if (user_mode(regs) && (current->thread.align_ctl & PR_UNALIGN_SIGBUS))
         |                                                ^
   arch/riscv/kernel/traps_misaligned.c: In function 'handle_misaligned_store':
   arch/riscv/kernel/traps_misaligned.c:522:48: error: 'struct thread_struct' has no member named 'align_ctl'
     522 |         if (user_mode(regs) && (current->thread.align_ctl & PR_UNALIGN_SIGBUS))
         |                                                ^
   arch/riscv/kernel/traps_misaligned.c: In function 'check_unaligned_access_emulated':
>> arch/riscv/kernel/traps_misaligned.c:610:17: error: expected ':' or ')' before '_ASM_EXTABLE'
     610 |                 _ASM_EXTABLE(1b, 2b)
         |                 ^~~~~~~~~~~~
>> arch/riscv/kernel/traps_misaligned.c:610:30: error: invalid suffix "b" on integer constant
     610 |                 _ASM_EXTABLE(1b, 2b)
         |                              ^~
   arch/riscv/kernel/traps_misaligned.c:610:34: error: invalid suffix "b" on integer constant
     610 |                 _ASM_EXTABLE(1b, 2b)
         |                                  ^~
>> arch/riscv/kernel/traps_misaligned.c:602:37: warning: unused variable 'tmp_var' [-Wunused-variable]
     602 |         unsigned long emulated = 1, tmp_var;
         |                                     ^~~~~~~


vim +610 arch/riscv/kernel/traps_misaligned.c

   599	
   600	bool check_unaligned_access_emulated(int cpu)
   601	{
 > 602		unsigned long emulated = 1, tmp_var;
   603	
   604		/* Use a fixup to detect if misaligned access triggered an exception */
   605		__asm__ __volatile__ (
   606			"1:\n"
   607			"	"REG_L" %[tmp], 1(%[ptr])\n"
   608			"	li %[emulated], 0\n"
   609			"2:\n"
 > 610			_ASM_EXTABLE(1b, 2b)
   611		: [emulated] "+r" (emulated), [tmp] "=r" (tmp_var)
   612		: [ptr] "r" (&tmp_var)
   613		: "memory");
   614	
   615		if (!emulated)
   616			return false;
   617	
   618		per_cpu(misaligned_access_speed, cpu) =
   619			RISCV_HWPROBE_MISALIGNED_EMULATED;
   620	
   621		return true;
   622	}
   623	

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