linux-kernel - [tip:WIP.x86/pti-upstream 38/50] arch/x86/include/asm/mmu_context.h:73:18: error: 'LDT_BASE

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Date:   Sun, 17 Dec 2017 07:35:53 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        tipbuild@...or.com, Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:WIP.x86/pti-upstream 38/50]
 arch/x86/include/asm/mmu_context.h:73:18: error: 'LDT_BASE_ADDR' undeclared

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti-upstream
head:   78e4da51f7c77587cc6f419af4f63a21b289bdb7
commit: 7e482cfe4a23ead21215423c4566c8516ba21025 [38/50] x86/pti: Put the LDT in its own PGD if PTI is on
config: i386-randconfig-h0-12170619 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 7e482cfe4a23ead21215423c4566c8516ba21025
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from arch/x86//kernel/apic/ipi.c:16:0:
   arch/x86/include/asm/mmu_context.h: In function 'ldt_slot_va':
>> arch/x86/include/asm/mmu_context.h:73:18: error: 'LDT_BASE_ADDR' undeclared (first use in this function)
     return (void *)(LDT_BASE_ADDR + LDT_SLOT_STRIDE * slot);
                     ^~~~~~~~~~~~~
   arch/x86/include/asm/mmu_context.h:73:18: note: each undeclared identifier is reported only once for each function it appears in
--
   In file included from arch/x86//kernel/cpu/common.c:22:0:
   arch/x86/include/asm/mmu_context.h: In function 'ldt_slot_va':
>> arch/x86/include/asm/mmu_context.h:73:18: error: 'LDT_BASE_ADDR' undeclared (first use in this function)
     return (void *)(LDT_BASE_ADDR + LDT_SLOT_STRIDE * slot);
                     ^~~~~~~~~~~~~
   arch/x86/include/asm/mmu_context.h:73:18: note: each undeclared identifier is reported only once for each function it appears in
   In file included from arch/x86//kernel/cpu/common.c:22:0:
   arch/x86/include/asm/mmu_context.h:74:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +/LDT_BASE_ADDR +73 arch/x86/include/asm/mmu_context.h

    70	
    71	static inline void *ldt_slot_va(int slot)
    72	{
  > 73		return (void *)(LDT_BASE_ADDR + LDT_SLOT_STRIDE * slot);
    74	}
    75	

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