linux-kernel - [tip:WIP.x86/pti 21/54] arch/x86/include/asm/pgtable.h:47:8: error: unknown type name 'spinlock

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Date:   Thu, 21 Dec 2017 06:21:02 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.x86/pti 21/54] arch/x86/include/asm/pgtable.h:47:8: error:
 unknown type name 'spinlock_t'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
head:   448c49e07e52076586e9e706212298d865ad7a27
commit: f443b8fc21e63b63b3064974c27ab78cbcb39c07 [21/54] x86/cpu_entry_area: Move it to a separate unit
config: x86_64-randconfig-x011-201751 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        git checkout f443b8fc21e63b63b3064974c27ab78cbcb39c07
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from arch/x86/mm/cpu_entry_area.c:5:0:
>> arch/x86/include/asm/pgtable.h:47:8: error: unknown type name 'spinlock_t'
    extern spinlock_t pgd_lock;
           ^~~~~~~~~~

vim +/spinlock_t +47 arch/x86/include/asm/pgtable.h

8405b122 include/asm-x86/pgtable.h Jeremy Fitzhardinge 2008-01-30  46  
e3ed910d include/asm-x86/pgtable.h Jeremy Fitzhardinge 2008-01-30 @47  extern spinlock_t pgd_lock;
e3ed910d include/asm-x86/pgtable.h Jeremy Fitzhardinge 2008-01-30  48  extern struct list_head pgd_list;
8405b122 include/asm-x86/pgtable.h Jeremy Fitzhardinge 2008-01-30  49  

:::::: The code at line 47 was first introduced by commit
:::::: e3ed910db221768f8fd6192b13373e17d61bcdf0 x86: use the same pgd_list for PAE and 64-bit

:::::: TO: Jeremy Fitzhardinge <jeremy@...p.org>
:::::: CC: Ingo Molnar <mingo@...e.hu>

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