linux-kernel - drivers/video/fbdev/aty/atyfb_base.c:3461:2: error: implicit declaration of function 'ioremap

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Date:	Sun, 6 Mar 2016 20:14:07 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>
Subject: drivers/video/fbdev/aty/atyfb_base.c:3461:2: error: implicit
 declaration of function 'ioremap_uc'

Hi Luis,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   67944024c1cdd897e49a09b0d6af3ea38d1388ca
commit: 3cc2dac5be3f23414a4efdee0b26d79bed297cac drivers/video/fbdev/atyfb: Replace MTRR UC hole with strong UC
date:   8 months ago
config: ia64-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3cc2dac5be3f23414a4efdee0b26d79bed297cac
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   drivers/video/fbdev/aty/atyfb_base.c: In function 'atyfb_setup_generic':
>> drivers/video/fbdev/aty/atyfb_base.c:3461:2: error: implicit declaration of function 'ioremap_uc' [-Werror=implicit-function-declaration]
     par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000);
     ^
   drivers/video/fbdev/aty/atyfb_base.c:3461:19: warning: assignment makes pointer from integer without a cast
     par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000);
                      ^
   cc1: some warnings being treated as errors

vim +/ioremap_uc +3461 drivers/video/fbdev/aty/atyfb_base.c

  3455	
  3456		info->fix.mmio_start = raddr;
  3457		/*
  3458		 * By using strong UC we force the MTRR to never have an
  3459		 * effect on the MMIO region on both non-PAT and PAT systems.
  3460		 */
> 3461		par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000);
  3462		if (par->ati_regbase == NULL)
  3463			return -ENOMEM;
  3464	

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