tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   01c8787d7f7ea56c16d94cf7133022189be231ad
commit: ecc83243e1d4f67015906017e420435aff1104c9 [2058/2223] uaccess: reimplement probe_kernel_address() using probe_kernel_read()
config: powerpc-xes_mpc85xx_defconfig (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 ecc83243e1d4f67015906017e420435aff1104c9
  # save the attached .config to linux build tree
  make.cross ARCH=powerpc 

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/sysdev/fsl_pci.c:31:0:
   arch/powerpc/sysdev/fsl_pci.c: In function 'fsl_pci_mcheck_exception':
   include/linux/uaccess.h:112:2: error: passing argument 2 of 'probe_kernel_read' makes pointer from integer without a cast [-Werror]
     probe_kernel_read(&retval, addr, sizeof(retval))
     ^
>> arch/powerpc/sysdev/fsl_pci.c:1002:10: note: in expansion of macro 'probe_kernel_address'
       ret = probe_kernel_address(regs->nip, inst);
             ^
   include/linux/uaccess.h:87:13: note: expected 'const void *' but argument is of type 'long unsigned int'
    extern long probe_kernel_read(void *dst, const void *src, size_t size);
                ^
   cc1: all warnings being treated as errors

vim +/probe_kernel_address +1002 arch/powerpc/sysdev/fsl_pci.c

4e0e3435 Hongtao Jia 2013-04-28   986  	/* Let KVM/QEMU deal with the exception */
4e0e3435 Hongtao Jia 2013-04-28   987  	if (regs->msr & MSR_GS)
4e0e3435 Hongtao Jia 2013-04-28   988  		return 0;
4e0e3435 Hongtao Jia 2013-04-28   989  
4e0e3435 Hongtao Jia 2013-04-28   990  #ifdef CONFIG_PHYS_64BIT
4e0e3435 Hongtao Jia 2013-04-28   991  	addr = mfspr(SPRN_MCARU);
4e0e3435 Hongtao Jia 2013-04-28   992  	addr <<= 32;
4e0e3435 Hongtao Jia 2013-04-28   993  #endif
4e0e3435 Hongtao Jia 2013-04-28   994  	addr += mfspr(SPRN_MCAR);
4e0e3435 Hongtao Jia 2013-04-28   995  
4e0e3435 Hongtao Jia 2013-04-28   996  	if (is_in_pci_mem_space(addr)) {
4e0e3435 Hongtao Jia 2013-04-28   997  		if (user_mode(regs)) {
4e0e3435 Hongtao Jia 2013-04-28   998  			pagefault_disable();
4e0e3435 Hongtao Jia 2013-04-28   999  			ret = get_user(regs->nip, &inst);
4e0e3435 Hongtao Jia 2013-04-28  1000  			pagefault_enable();
4e0e3435 Hongtao Jia 2013-04-28  1001  		} else {
4e0e3435 Hongtao Jia 2013-04-28 @1002  			ret = probe_kernel_address(regs->nip, inst);
4e0e3435 Hongtao Jia 2013-04-28  1003  		}
4e0e3435 Hongtao Jia 2013-04-28  1004  
4e0e3435 Hongtao Jia 2013-04-28  1005  		if (mcheck_handle_load(regs, inst)) {
4e0e3435 Hongtao Jia 2013-04-28  1006  			regs->nip += 4;
4e0e3435 Hongtao Jia 2013-04-28  1007  			return 1;
4e0e3435 Hongtao Jia 2013-04-28  1008  		}
4e0e3435 Hongtao Jia 2013-04-28  1009  	}
4e0e3435 Hongtao Jia 2013-04-28  1010  

:::::: The code at line 1002 was first introduced by commit
:::::: 4e0e3435b50285eafe5898124ce02f7577f6803a powerpc/85xx: Add machine check handler to fix PCIe erratum on mpc85xx

:::::: TO: Hongtao Jia <hongtao.jia@freescale.com>
:::::: CC: Scott Wood <scottwood@freescale.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation