linux-kernel - Re: arch/cris/arch-v32/mm/intmem.c:148:17: error: initialization from incompatible pointer type

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Date:   Fri, 23 Sep 2016 11:14:31 +0200
From:   Jesper Nilsson <jesper.nilsson@...s.com>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     Daniel Wagner <daniel.wagner@...-carit.de>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.com>
Subject: Re: arch/cris/arch-v32/mm/intmem.c:148:17: error: initialization
 from incompatible pointer type

Hi,

There should be some fixes in linux-next today for this.

/Jesper

On Thu, Sep 22, 2016 at 09:15:38PM +0800, kbuild test robot wrote:
> Hi Daniel,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   7d1e042314619115153a0f6f06e4552c09a50e13
> commit: ea8daa7b97842aab8507b5b5b1e3226cf2d514a6 kbuild: Add option to turn incompatible pointer check into error
> date:   6 months ago
> config: cris-etraxfs_defconfig (attached as .config)
> compiler: cris-linux-gcc (GCC) 6.2.0
> 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 ea8daa7b97842aab8507b5b5b1e3226cf2d514a6
>         # save the attached .config to linux build tree
>         make.cross ARCH=cris 
> 
> All errors (new ones prefixed by >>):
> 
>    arch/cris/arch-v32/mm/intmem.c: In function 'crisv32_intmem_free':
>    arch/cris/arch-v32/mm/intmem.c:116:14: warning: comparison of distinct pointer types lacks a cast
>        if ((prev != &intmem_allocations) &&
>                  ^~
>    arch/cris/arch-v32/mm/intmem.c:123:14: warning: comparison of distinct pointer types lacks a cast
>        if ((next != &intmem_allocations) &&
>                  ^~
>    In file included from include/linux/printk.h:5:0,
>                     from include/linux/kernel.h:13,
>                     from include/linux/list.h:8,
>                     from arch/cris/arch-v32/mm/intmem.c:7:
>    arch/cris/arch-v32/mm/intmem.c: At top level:
> >> arch/cris/arch-v32/mm/intmem.c:148:17: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
>     device_initcall(crisv32_intmem_init);
>                     ^
>    include/linux/init.h:184:58: note: in definition of macro '__define_initcall'
>      __attribute__((__section__(".initcall" #id ".init"))) = fn; \
>                                                              ^~
>    arch/cris/arch-v32/mm/intmem.c:148:1: note: in expansion of macro 'device_initcall'
>     device_initcall(crisv32_intmem_init);
>     ^~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
> 
> vim +148 arch/cris/arch-v32/mm/intmem.c
> 
> 108ecfbc Jesper Nilsson 2008-01-25  117  					(prev->status == STATUS_FREE)) {
> 51533b61 Mikael Starvik 2005-07-27  118  				prev->size += allocation->size;
> 51533b61 Mikael Starvik 2005-07-27  119  				list_del(&allocation->entry);
> 51533b61 Mikael Starvik 2005-07-27  120  				kfree(allocation);
> 51533b61 Mikael Starvik 2005-07-27  121  				allocation = prev;
> 51533b61 Mikael Starvik 2005-07-27  122  			}
> 108ecfbc Jesper Nilsson 2008-01-25 @123  			if ((next != &intmem_allocations) &&
> 108ecfbc Jesper Nilsson 2008-01-25  124  					(next->status == STATUS_FREE)) {
> 51533b61 Mikael Starvik 2005-07-27  125  				allocation->size += next->size;
> 51533b61 Mikael Starvik 2005-07-27  126  				list_del(&next->entry);
> 51533b61 Mikael Starvik 2005-07-27  127  				kfree(next);
> 51533b61 Mikael Starvik 2005-07-27  128  			}
> 51533b61 Mikael Starvik 2005-07-27  129  			preempt_enable();
> 51533b61 Mikael Starvik 2005-07-27  130  			return;
> 51533b61 Mikael Starvik 2005-07-27  131  		}
> 51533b61 Mikael Starvik 2005-07-27  132  	}
> 51533b61 Mikael Starvik 2005-07-27  133  	preempt_enable();
> 51533b61 Mikael Starvik 2005-07-27  134  }
> 51533b61 Mikael Starvik 2005-07-27  135  
> 51533b61 Mikael Starvik 2005-07-27  136  void* crisv32_intmem_phys_to_virt(unsigned long addr)
> 51533b61 Mikael Starvik 2005-07-27  137  {
> 108ecfbc Jesper Nilsson 2008-01-25  138  	return (void *)(addr - (MEM_INTMEM_START + RESERVED_SIZE) +
> 51533b61 Mikael Starvik 2005-07-27  139  		(unsigned long)intmem_virtual);
> 51533b61 Mikael Starvik 2005-07-27  140  }
> 51533b61 Mikael Starvik 2005-07-27  141  
> 51533b61 Mikael Starvik 2005-07-27  142  unsigned long crisv32_intmem_virt_to_phys(void* addr)
> 51533b61 Mikael Starvik 2005-07-27  143  {
> 51533b61 Mikael Starvik 2005-07-27  144  	return (unsigned long)((unsigned long )addr -
> 108ecfbc Jesper Nilsson 2008-01-25  145  		(unsigned long)intmem_virtual + MEM_INTMEM_START +
> 108ecfbc Jesper Nilsson 2008-01-25  146  		RESERVED_SIZE);
> 51533b61 Mikael Starvik 2005-07-27  147  }
> 73de14e8 Paul Gortmaker 2015-05-01 @148  device_initcall(crisv32_intmem_init);
> 51533b61 Mikael Starvik 2005-07-27  149  
> 
> :::::: The code at line 148 was first introduced by commit
> :::::: 73de14e8cdc733bbc8eda006f813d5aa51511139 cris: don't use module_init for non-modular core intmem.c code
> 
> :::::: TO: Paul Gortmaker <paul.gortmaker@...driver.com>
> :::::: CC: Paul Gortmaker <paul.gortmaker@...driver.com>
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation



/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com