linux-kernel - [tip:WIP.x86/pti 1/1] arch/x86/mm/cpu_entry_area.c:153:33: error: 'CPU_ENTRY_AREA_END' undeclared; did you mean 'CPU_ENTRY_AREA

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Message-ID: <201712240347.5x9Cd697%fengguang.wu@intel.com>
Date:   Sun, 24 Dec 2017 03:04:51 +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 1/1] arch/x86/mm/cpu_entry_area.c:153:33: error:
 'CPU_ENTRY_AREA_END' undeclared; did you mean 'CPU_ENTRY_AREA_BASE'?

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
head:   1c4c1c2fa0c5c121210d47bc74ee85c5032b3ea9
commit: 1c4c1c2fa0c5c121210d47bc74ee85c5032b3ea9 [1/1] x86/pti: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
config: i386-randconfig-x007-201752 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        git checkout 1c4c1c2fa0c5c121210d47bc74ee85c5032b3ea9
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/mm/cpu_entry_area.c: In function 'setup_cpu_entry_area_ptes':
>> arch/x86/mm/cpu_entry_area.c:153:33: error: 'CPU_ENTRY_AREA_END' undeclared (first use in this function); did you mean 'CPU_ENTRY_AREA_BASE'?
     for (; start < end && start >= CPU_ENTRY_AREA_END; start += PMD_SIZE)
                                    ^~~~~~~~~~~~~~~~~~
                                    CPU_ENTRY_AREA_BASE
   arch/x86/mm/cpu_entry_area.c:153:33: note: each undeclared identifier is reported only once for each function it appears in

vim +153 arch/x86/mm/cpu_entry_area.c

   140	
   141	static __init void setup_cpu_entry_area_ptes(void)
   142	{
   143	#ifdef CONFIG_X86_32
   144		unsigned long start, end;
   145	
   146		BUILD_BUG_ON(CPU_ENTRY_AREA_PAGES * PAGE_SIZE < CPU_ENTRY_AREA_MAP_SIZE);
   147		BUG_ON(CPU_ENTRY_AREA_BASE & ~PMD_MASK);
   148	
   149		start = CPU_ENTRY_AREA_BASE;
   150		end = start + CPU_ENTRY_AREA_MAP_SIZE;
   151	
   152		/* Careful here: start + PMD_SIZE might wrap around */
 > 153		for (; start < end && start >= CPU_ENTRY_AREA_END; start += PMD_SIZE)
   154			populate_extra_pte(start);
   155	#endif
   156	}
   157	

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