linux-kernel - Re: [PATCH 2/2] ppdev: add support for compat ioctl

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Date:	Wed, 9 Dec 2015 14:39:30 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	y2038@...ts.linaro.org, gregkh@...uxfoundation.org, arnd@...db.de,
	sudipm.mukherjee@...il.com, broonie@...nel.org,
	Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Subject: Re: [PATCH 2/2] ppdev: add support for compat ioctl

Hi Bamvor,

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v4.4-rc4 next-20151208]

url:    https://github.com/0day-ci/linux/commits/Bamvor-Jian-Zhang/Convert-ppdev-to-y2038-safe/20151209-141616
config: x86_64-randconfig-n0-12091355 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/char/ppdev.c: In function 'pp_compat_ioctl':
>> drivers/char/ppdev.c:677:44: error: implicit declaration of function 'compat_ptr' [-Werror=implicit-function-declaration]
     return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
                                               ^
   cc1: some warnings being treated as errors

vim +/compat_ptr +677 drivers/char/ppdev.c

   671	}
   672	
   673	#ifdef CONFIG_COMPAT
   674	static long pp_compat_ioctl(struct file *file, unsigned int cmd,
   675			unsigned long arg)
   676	{
 > 677		return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
   678	}
   679	#endif
   680	

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