linux-kernel - arch/sparc/kernel/process_64.c:677:5: error: no previous prototype for 'arch_dup_task

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Date:   Wed, 30 Mar 2022 22:32:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Anthony Yznaga <anthony.yznaga@...cle.com>
Subject: arch/sparc/kernel/process_64.c:677:5: error: no previous prototype
 for 'arch_dup_task_struct'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d888c83fcec75194a8a48ccd283953bdba7b2550
commit: 74a04967482faa7144b93dae3b2e913870dd421c sparc64: Add support for ADI (Application Data Integrity)
date:   4 years ago
config: sparc64-randconfig-r004-20220330 (https://download.01.org/0day-ci/archive/20220330/202203302224.qSPZdQcq-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
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=74a04967482faa7144b93dae3b2e913870dd421c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 74a04967482faa7144b93dae3b2e913870dd421c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sparc64 SHELL=/bin/bash M=arch/sparc/kernel

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

All errors (new ones prefixed by >>):

>> arch/sparc/kernel/process_64.c:677:5: error: no previous prototype for 'arch_dup_task_struct' [-Werror=missing-prototypes]
     677 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
         |     ^~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors
--
>> arch/sparc/kernel/adi_64.c:125:21: error: no previous prototype for 'find_tag_store' [-Werror=missing-prototypes]
     125 | tag_storage_desc_t *find_tag_store(struct mm_struct *mm,
         |                     ^~~~~~~~~~~~~~
   arch/sparc/kernel/adi_64.c:157:21: error: no previous prototype for 'alloc_tag_store' [-Werror=missing-prototypes]
     157 | tag_storage_desc_t *alloc_tag_store(struct mm_struct *mm,
         |                     ^~~~~~~~~~~~~~~
   arch/sparc/kernel/adi_64.c:300:6: error: no previous prototype for 'del_tag_store' [-Werror=missing-prototypes]
     300 | void del_tag_store(tag_storage_desc_t *tag_desc, struct mm_struct *mm)
         |      ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/arch_dup_task_struct +677 arch/sparc/kernel/process_64.c

   672	
   673	/* TIF_MCDPER in thread info flags for current task is updated lazily upon
   674	 * a context switch. Update this flag in current task's thread flags
   675	 * before dup so the dup'd task will inherit the current TIF_MCDPER flag.
   676	 */
 > 677	int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
   678	{
   679		if (adi_capable()) {
   680			register unsigned long tmp_mcdper;
   681	
   682			__asm__ __volatile__(
   683				".word 0x83438000\n\t"	/* rd  %mcdper, %g1 */
   684				"mov %%g1, %0\n\t"
   685				: "=r" (tmp_mcdper)
   686				:
   687				: "g1");
   688			if (tmp_mcdper)
   689				set_thread_flag(TIF_MCDPER);
   690			else
   691				clear_thread_flag(TIF_MCDPER);
   692		}
   693	
   694		*dst = *src;
   695		return 0;
   696	}
   697	

-- 
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