linux-kernel - [tip:x86/mm 1/1] arch/x86/include/asm/compat.h:310:8: note: in expansion of macro 'task_pt

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Date:   Tue, 14 Mar 2017 23:22:58 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:x86/mm 1/1] arch/x86/include/asm/compat.h:310:8: note: in
 expansion of macro 'task_pt_regs'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/mm
head:   7d5c038a03acfbedeb3ffef9da1814a47191f6f1
commit: 7d5c038a03acfbedeb3ffef9da1814a47191f6f1 [1/1] x86/hugetlb: Adjust to the new native/compat mmap bases
config: i386-randconfig-x002-201711 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 7d5c038a03acfbedeb3ffef9da1814a47191f6f1
        # save the attached .config to linux build tree
        make ARCH=i386 

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

   In file included from arch/x86/include/asm/cpufeature.h:4:0,
                    from arch/x86/include/asm/thread_info.h:52,
                    from include/linux/thread_info.h:25,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:80,
                    from include/linux/spinlock.h:50,
                    from include/linux/mmzone.h:7,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from arch/x86/mm/mmap.c:28:
   arch/x86/include/asm/compat.h: In function 'arch_compat_alloc_user_space':
>> arch/x86/include/asm/processor.h:825:39: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration]
     unsigned long __ptr = (unsigned long)task_stack_page(task); \
                                          ^
>> arch/x86/include/asm/compat.h:310:8: note: in expansion of macro 'task_pt_regs'
      sp = task_pt_regs(current)->sp;
           ^~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/task_pt_regs +310 arch/x86/include/asm/compat.h

^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  294  
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  295  static inline void __user *compat_ptr(compat_uptr_t uptr)
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  296  {
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  297  	return (void __user *)(unsigned long)uptr;
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  298  }
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  299  
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  300  static inline compat_uptr_t ptr_to_compat(void __user *uptr)
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  301  {
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  302  	return (u32)(unsigned long)uptr;
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  303  }
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  304  
c41d68a5 arch/x86/include/asm/compat.h H. Peter Anvin 2010-09-07  305  static inline void __user *arch_compat_alloc_user_space(long len)
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  306  {
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  307  	compat_uptr_t sp;
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  308  
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  309  	if (test_thread_flag(TIF_IA32)) {
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19 @310  		sp = task_pt_regs(current)->sp;
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  311  	} else {
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  312  		/* -128 for the x32 ABI redzone */
263042e4 arch/x86/include/asm/compat.h Denys Vlasenko 2015-03-09  313  		sp = task_pt_regs(current)->sp - 128;
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  314  	}
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  315  
d1a797f3 arch/x86/include/asm/compat.h H. Peter Anvin 2012-02-19  316  	return (void __user *)round_down(sp - len, 16);
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  317  }
^1da177e include/asm-x86_64/compat.h   Linus Torvalds 2005-04-16  318  

:::::: The code at line 310 was first introduced by commit
:::::: d1a797f388d6d30fa502915d1b9937ed758b7137 x32: Handle process creation

:::::: TO: H. Peter Anvin <hpa@...or.com>
:::::: CC: H. Peter Anvin <hpa@...or.com>

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