linux-kernel - Re: [PATCH v4 02/10] include: Move compat_timespec/ timeval to compat

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Date:   Tue, 13 Mar 2018 23:30:51 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     kbuild-all@...org, arnd@...db.de, tglx@...utronix.de,
        john.stultz@...aro.org, mark.rutland@....com,
        linux-mips@...ux-mips.org, peterz@...radead.org,
        benh@...nel.crashing.org, heiko.carstens@...ibm.com,
        paulus@...ba.org, hpa@...or.com, sparclinux@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-s390@...r.kernel.org,
        y2038@...ts.linaro.org, mpe@...erman.id.au, deller@....de,
        x86@...nel.org, sebott@...ux.vnet.ibm.com, jejb@...isc-linux.org,
        will.deacon@....com, borntraeger@...ibm.com, mingo@...hat.com,
        oprofile-list@...ts.sf.net, catalin.marinas@....com,
        rric@...nel.org, cmetcalf@...lanox.com, oberpar@...ux.vnet.ibm.com,
        acme@...nel.org, jwi@...ux.vnet.ibm.com, rostedt@...dmis.org,
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        ralf@...ux-mips.org, hoeppner@...ux.vnet.ibm.com,
        sth@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        linuxppc-dev@...ts.ozlabs.org, davem@...emloft.net
Subject: Re: [PATCH v4 02/10] include: Move compat_timespec/ timeval to
 compat_time.h

Hi Deepa,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on ]

url:    https://github.com/0day-ci/linux/commits/Deepa-Dinamani/posix_clocks-Prepare-syscalls-for-64-bit-time_t-conversion/20180313-203305
base:    
config: powerpc-iss476-smp_defconfig (attached as .config)
compiler: powerpc-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All errors (new ones prefixed by >>):

   arch/powerpc/oprofile/backtrace.c: In function 'user_getsp32':
>> arch/powerpc/oprofile/backtrace.c:31:19: error: implicit declaration of function 'compat_ptr'; did you mean 'complete'? [-Werror=implicit-function-declaration]
     void __user *p = compat_ptr(sp);
                      ^~~~~~~~~~
                      complete
>> arch/powerpc/oprofile/backtrace.c:31:19: error: initialization makes pointer from integer without a cast [-Werror=int-conversion]
   cc1: all warnings being treated as errors

vim +31 arch/powerpc/oprofile/backtrace.c

6c6bd754 Brian Rogan 2006-03-27  27  
6c6bd754 Brian Rogan 2006-03-27  28  static unsigned int user_getsp32(unsigned int sp, int is_first)
6c6bd754 Brian Rogan 2006-03-27  29  {
6c6bd754 Brian Rogan 2006-03-27  30  	unsigned int stack_frame[2];
62034f03 Al Viro     2006-09-23 @31  	void __user *p = compat_ptr(sp);
6c6bd754 Brian Rogan 2006-03-27  32  
62034f03 Al Viro     2006-09-23  33  	if (!access_ok(VERIFY_READ, p, sizeof(stack_frame)))
6c6bd754 Brian Rogan 2006-03-27  34  		return 0;
6c6bd754 Brian Rogan 2006-03-27  35  
6c6bd754 Brian Rogan 2006-03-27  36  	/*
6c6bd754 Brian Rogan 2006-03-27  37  	 * The most likely reason for this is that we returned -EFAULT,
6c6bd754 Brian Rogan 2006-03-27  38  	 * which means that we've done all that we can do from
6c6bd754 Brian Rogan 2006-03-27  39  	 * interrupt context.
6c6bd754 Brian Rogan 2006-03-27  40  	 */
62034f03 Al Viro     2006-09-23  41  	if (__copy_from_user_inatomic(stack_frame, p, sizeof(stack_frame)))
6c6bd754 Brian Rogan 2006-03-27  42  		return 0;
6c6bd754 Brian Rogan 2006-03-27  43  
6c6bd754 Brian Rogan 2006-03-27  44  	if (!is_first)
6c6bd754 Brian Rogan 2006-03-27  45  		oprofile_add_trace(STACK_LR32(stack_frame));
6c6bd754 Brian Rogan 2006-03-27  46  
6c6bd754 Brian Rogan 2006-03-27  47  	/*
6c6bd754 Brian Rogan 2006-03-27  48  	 * We do not enforce increasing stack addresses here because
6c6bd754 Brian Rogan 2006-03-27  49  	 * we may transition to a different stack, eg a signal handler.
6c6bd754 Brian Rogan 2006-03-27  50  	 */
6c6bd754 Brian Rogan 2006-03-27  51  	return STACK_SP(stack_frame);
6c6bd754 Brian Rogan 2006-03-27  52  }
6c6bd754 Brian Rogan 2006-03-27  53  

:::::: The code at line 31 was first introduced by commit
:::::: 62034f03380a64c0144b6721f4a2aa55d65346c1 [POWERPC] powerpc oprofile __user annotations

:::::: TO: Al Viro <viro@....linux.org.uk>
:::::: CC: Paul Mackerras <paulus@...ba.org>

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