linux-kernel - arch/alpha/include/asm/mmu_context.h:160:2: error: implicit declaration of function 'task_thread

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Date:   Sun, 17 Sep 2017 09:50:18 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Felix Kuehling <Felix.Kuehling@....com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Oded Gabbay <oded.gabbay@...il.com>
Subject: arch/alpha/include/asm/mmu_context.h:160:2: error: implicit
 declaration of function 'task_thread_info'

Hi Felix,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e
commit: 70539bd79500245cbb4c7af00572fcce540d0105 drm/amd: Update MEC HQD loading code for KFD
date:   5 weeks ago
config: alpha-allmodconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 70539bd79500245cbb4c7af00572fcce540d0105
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   In file included from include/linux/mmu_context.h:4:0,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:29,
                    from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:23:
   arch/alpha/include/asm/mmu_context.h: In function 'ev5_switch_mm':
>> arch/alpha/include/asm/mmu_context.h:160:2: error: implicit declaration of function 'task_thread_info' [-Werror=implicit-function-declaration]
     task_thread_info(next)->pcb.asn = mmc & HARDWARE_ASN_MASK;
     ^~~~~~~~~~~~~~~~
>> arch/alpha/include/asm/mmu_context.h:160:24: error: invalid type argument of '->' (have 'int')
     task_thread_info(next)->pcb.asn = mmc & HARDWARE_ASN_MASK;
                           ^~
   arch/alpha/include/asm/mmu_context.h: In function 'init_new_context':
   arch/alpha/include/asm/mmu_context.h:238:24: error: invalid type argument of '->' (have 'int')
      task_thread_info(tsk)->pcb.ptbr
                           ^~
   arch/alpha/include/asm/mmu_context.h: In function 'enter_lazy_tlb':
   arch/alpha/include/asm/mmu_context.h:252:23: error: invalid type argument of '->' (have 'int')
     task_thread_info(tsk)->pcb.ptbr
                          ^~
   cc1: some warnings being treated as errors

vim +/task_thread_info +160 arch/alpha/include/asm/mmu_context.h

^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  156  
^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  157  	/* Always update the PCB ASN.  Another thread may have allocated
^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  158  	   a new mm->context (via flush_tlb_mm) without the ASN serial
^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  159  	   number wrapping.  We have no way to detect when this is needed.  */
37bfbaf99 include/asm-alpha/mmu_context.h Al Viro        2006-01-12 @160  	task_thread_info(next)->pcb.asn = mmc & HARDWARE_ASN_MASK;
^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  161  }
^1da177e4 include/asm-alpha/mmu_context.h Linus Torvalds 2005-04-16  162  

:::::: The code at line 160 was first introduced by commit
:::::: 37bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8 [PATCH] alpha: task_thread_info()

:::::: TO: Al Viro <viro@....linux.org.uk>
:::::: CC: Linus Torvalds <torvalds@...osdl.org>

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