linux-kernel - arch/sparc/kernel/traps_64.c:268:6: error: no previous declaration for 'is_no_fault

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Date:   Tue, 20 Dec 2022 08:39:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     Rob Gardner <rob.gardner@...cle.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: arch/sparc/kernel/traps_64.c:268:6: error: no previous declaration
 for 'is_no_fault_exception'

Hi Rob,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6feb57c2fd7c787aecf2846a535248899e7b70fa
commit: b6fe1089667a7afcc2cf92cdaec590c7b8381715 sparc64: Handle additional cases of no fault loads
date:   5 years ago
config: sparc-buildonly-randconfig-r004-20221218
compiler: sparc64-linux-gcc (GCC) 7.5.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b6fe1089667a7afcc2cf92cdaec590c7b8381715
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b6fe1089667a7afcc2cf92cdaec590c7b8381715
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross W=1 O=build_dir ARCH=sparc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross W=1 O=build_dir ARCH=sparc SHELL=/bin/bash arch/sparc/kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> arch/sparc/kernel/traps_64.c:268:6: error: no previous declaration for 'is_no_fault_exception' [-Werror=missing-declarations]
    bool is_no_fault_exception(struct pt_regs *regs)
         ^~~~~~~~~~~~~~~~~~~~~
   arch/sparc/kernel/traps_64.c:2117:6: error: no previous declaration for 'sun4v_nonresum_error_user_handled' [-Werror=missing-declarations]
    bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/is_no_fault_exception +268 arch/sparc/kernel/traps_64.c

   267	
 > 268	bool is_no_fault_exception(struct pt_regs *regs)
   269	{
   270		unsigned char asi;
   271		u32 insn;
   272	
   273		if (get_user(insn, (u32 __user *)regs->tpc) == -EFAULT)
   274			return false;
   275	
   276		/*
   277		 * Must do a little instruction decoding here in order to
   278		 * decide on a course of action. The bits of interest are:
   279		 *  insn[31:30] = op, where 3 indicates the load/store group
   280		 *  insn[24:19] = op3, which identifies individual opcodes
   281		 *  insn[13] indicates an immediate offset
   282		 *  op3[4]=1 identifies alternate space instructions
   283		 *  op3[5:4]=3 identifies floating point instructions
   284		 *  op3[2]=1 identifies stores
   285		 * See "Opcode Maps" in the appendix of any Sparc V9
   286		 * architecture spec for full details.
   287		 */
   288		if ((insn & 0xc0800000) == 0xc0800000) {    /* op=3, op3[4]=1   */
   289			if (insn & 0x2000)		    /* immediate offset */
   290				asi = (regs->tstate >> 24); /* saved %asi       */
   291			else
   292				asi = (insn >> 5);	    /* immediate asi    */
   293			if ((asi & 0xf2) == ASI_PNF) {
   294				if (insn & 0x1000000) {     /* op3[5:4]=3       */
   295					handle_ldf_stq(insn, regs);
   296					return true;
   297				} else if (insn & 0x200000) { /* op3[2], stores */
   298					return false;
   299				}
   300				handle_ld_nf(insn, regs);
   301				return true;
   302			}
   303		}
   304		return false;
   305	}
   306	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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