linux-kernel - [tip:WIP.x86/apic 6/43] arch/x86//kernel/eisa.c:11:20: error: implicit declaration of function 'ioremap'

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Date:   Fri, 25 Aug 2017 19:15:51 +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/apic 6/43] arch/x86//kernel/eisa.c:11:20: error:
 implicit declaration of function 'ioremap'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/apic
head:   395b2c62edea5a2bb8a8786392feb12fae5917a7
commit: 2866949a138470c4a0a5b048b47d081618ce4278 [6/43] x86/boot: Move EISA setup to a proper place
config: i386-randconfig-x019-201734 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 2866949a138470c4a0a5b048b47d081618ce4278
        # save the attached .config to linux build tree
        make ARCH=i386 

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

   arch/x86//kernel/eisa.c: In function 'eisa_bus_probe':
>> arch/x86//kernel/eisa.c:11:20: error: implicit declaration of function 'ioremap' [-Werror=implicit-function-declaration]
     void __iomem *p = ioremap(0x0FFFD9, 4);
                       ^~~~~~~
>> arch/x86//kernel/eisa.c:11:20: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
>> arch/x86//kernel/eisa.c:13:6: error: implicit declaration of function 'readl' [-Werror=implicit-function-declaration]
     if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
         ^~~~~
>> arch/x86//kernel/eisa.c:15:2: error: implicit declaration of function 'iounmap' [-Werror=implicit-function-declaration]
     iounmap(p, 4);
     ^~~~~~~
   cc1: some warnings being treated as errors

vim +/ioremap +11 arch/x86//kernel/eisa.c

     8	
     9	static __init int eisa_bus_probe(void)
    10	{
  > 11		void __iomem *p = ioremap(0x0FFFD9, 4);
    12	
  > 13		if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
    14			EISA_bus = 1;
  > 15		iounmap(p, 4);

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