linux-kernel - [tip:core/urgent 1/1] arch/alpha/include/asm/ptrace.h:14:24: error: implicit declaration of function 'task_stack

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Date:   Sat, 16 Sep 2017 05:32:46 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: [tip:core/urgent 1/1] arch/alpha/include/asm/ptrace.h:14:24: error:
 implicit declaration of function 'task_stack_page'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent
head:   451eb3f2053ea4eeb40f94947c542cfbd7636186
commit: 451eb3f2053ea4eeb40f94947c542cfbd7636186 [1/1] fs/proc: Report eip/esp in /prod/PID/stat for coredumping
config: alpha-allyesconfig (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 451eb3f2053ea4eeb40f94947c542cfbd7636186
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

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

   In file included from include/linux/irq.h:28:0,
                    from include/asm-generic/hardirq.h:12,
                    from arch/alpha/include/asm/hardirq.h:7,
                    from include/linux/hardirq.h:8,
                    from include/linux/interrupt.h:12,
                    from include/linux/kernel_stat.h:8,
                    from fs/proc/array.c:59:
   fs/proc/array.c: In function 'do_task_stat':
>> arch/alpha/include/asm/ptrace.h:14:24: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration]
      ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
                           ^
>> arch/alpha/include/asm/processor.h:55:24: note: in expansion of macro 'task_pt_regs'
    #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
                           ^~~~~~~~~~~~
   fs/proc/array.c:430:10: note: in expansion of macro 'KSTK_EIP'
       eip = KSTK_EIP(task);
             ^~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/irq.h:28:0,
                    from include/asm-generic/hardirq.h:12,
                    from arch/alpha/include/asm/hardirq.h:7,
                    from include/linux/hardirq.h:8,
                    from include/linux/interrupt.h:12,
                    from include/linux/kernel_stat.h:8,
                    from fs//proc/array.c:59:
   fs//proc/array.c: In function 'do_task_stat':
>> arch/alpha/include/asm/ptrace.h:14:24: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration]
      ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
                           ^
>> arch/alpha/include/asm/processor.h:55:24: note: in expansion of macro 'task_pt_regs'
    #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
                           ^~~~~~~~~~~~
   fs//proc/array.c:430:10: note: in expansion of macro 'KSTK_EIP'
       eip = KSTK_EIP(task);
             ^~~~~~~~
   cc1: some warnings being treated as errors

vim +/task_stack_page +14 arch/alpha/include/asm/ptrace.h

^1da177e include/asm-alpha/ptrace.h Linus Torvalds 2005-04-16  12  
e52f4ca2 include/asm-alpha/ptrace.h akpm@...l.org  2006-01-12  13  #define task_pt_regs(task) \
27f45130 include/asm-alpha/ptrace.h Al Viro        2006-01-12 @14    ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
^1da177e include/asm-alpha/ptrace.h Linus Torvalds 2005-04-16  15  

:::::: The code at line 14 was first introduced by commit
:::::: 27f451304aa6f2bccf34ef3c2b049c01d05d6fff [PATCH] alpha: task_stack_page()

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

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