Re: [PATCH] asm/io: remove unnecessary xlate_dev_mem_ptr() and unxlate_dev_mem_ptr()

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Hi Kefeng,

kernel test robot noticed the following build errors:

[auto build test ERROR on soc/for-next]
[also build test ERROR on geert-m68k/for-next geert-m68k/for-linus deller-parisc/for-next powerpc/next powerpc/fixes linus/master v6.7-rc1 next-20231117]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kefeng-Wang/asm-io-remove-unnecessary-xlate_dev_mem_ptr-and-unxlate_dev_mem_ptr/20231118-183038
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
patch link:    https://lore.kernel.org/r/20231118100827.1599422-1-wangkefeng.wang%40huawei.com
patch subject: [PATCH] asm/io: remove unnecessary xlate_dev_mem_ptr() and unxlate_dev_mem_ptr()
config: mips-mtx1_defconfig (https://download.01.org/0day-ci/archive/20231119/202311191145.pppExJS6-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231119/202311191145.pppExJS6-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311191145.pppExJS6-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> drivers/char/mem.c:159:10: error: call to undeclared function 'xlate_dev_mem_ptr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           ptr = xlate_dev_mem_ptr(p);
                                 ^
>> drivers/char/mem.c:159:8: error: incompatible integer to pointer conversion assigning to 'void *' from 'int' [-Wint-conversion]
                           ptr = xlate_dev_mem_ptr(p);
                               ^ ~~~~~~~~~~~~~~~~~~~~
>> drivers/char/mem.c:164:4: error: call to undeclared function 'unxlate_dev_mem_ptr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           unxlate_dev_mem_ptr(p, ptr);
                           ^
   drivers/char/mem.c:235:10: error: call to undeclared function 'xlate_dev_mem_ptr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           ptr = xlate_dev_mem_ptr(p);
                                 ^
   drivers/char/mem.c:235:8: error: incompatible integer to pointer conversion assigning to 'void *' from 'int' [-Wint-conversion]
                           ptr = xlate_dev_mem_ptr(p);
                               ^ ~~~~~~~~~~~~~~~~~~~~
   drivers/char/mem.c:243:4: error: call to undeclared function 'unxlate_dev_mem_ptr'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                           unxlate_dev_mem_ptr(p, ptr);
                           ^
   6 errors generated.


vim +/xlate_dev_mem_ptr +159 drivers/char/mem.c

^1da177e4c3f41 Linus Torvalds                2005-04-16  133  
22ec1a2aea73b9 Kees Cook                     2017-12-01  134  	bounce = kmalloc(PAGE_SIZE, GFP_KERNEL);
22ec1a2aea73b9 Kees Cook                     2017-12-01  135  	if (!bounce)
22ec1a2aea73b9 Kees Cook                     2017-12-01  136  		return -ENOMEM;
22ec1a2aea73b9 Kees Cook                     2017-12-01  137  
^1da177e4c3f41 Linus Torvalds                2005-04-16  138  	while (count > 0) {
fa29e97bb8c70f Wu Fengguang                  2009-12-14  139  		unsigned long remaining;
b5b38200ebe548 Kees Cook                     2018-03-27  140  		int allowed, probe;
fa29e97bb8c70f Wu Fengguang                  2009-12-14  141  
f222318e9c3a31 Wu Fengguang                  2009-12-14  142  		sz = size_inside_page(p, count);
^1da177e4c3f41 Linus Torvalds                2005-04-16  143  
22ec1a2aea73b9 Kees Cook                     2017-12-01  144  		err = -EPERM;
a4866aa812518e Kees Cook                     2017-04-05  145  		allowed = page_is_allowed(p >> PAGE_SHIFT);
a4866aa812518e Kees Cook                     2017-04-05  146  		if (!allowed)
22ec1a2aea73b9 Kees Cook                     2017-12-01  147  			goto failed;
22ec1a2aea73b9 Kees Cook                     2017-12-01  148  
22ec1a2aea73b9 Kees Cook                     2017-12-01  149  		err = -EFAULT;
a4866aa812518e Kees Cook                     2017-04-05  150  		if (allowed == 2) {
a4866aa812518e Kees Cook                     2017-04-05  151  			/* Show zeros for restricted memory. */
a4866aa812518e Kees Cook                     2017-04-05  152  			remaining = clear_user(buf, sz);
a4866aa812518e Kees Cook                     2017-04-05  153  		} else {
^1da177e4c3f41 Linus Torvalds                2005-04-16  154  			/*
a4866aa812518e Kees Cook                     2017-04-05  155  			 * On ia64 if a page has been mapped somewhere as
a4866aa812518e Kees Cook                     2017-04-05  156  			 * uncached, then it must also be accessed uncached
a4866aa812518e Kees Cook                     2017-04-05  157  			 * by the kernel or data corruption may occur.
^1da177e4c3f41 Linus Torvalds                2005-04-16  158  			 */
^1da177e4c3f41 Linus Torvalds                2005-04-16 @159  			ptr = xlate_dev_mem_ptr(p);
e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18  160  			if (!ptr)
22ec1a2aea73b9 Kees Cook                     2017-12-01  161  				goto failed;
a4866aa812518e Kees Cook                     2017-04-05  162  
fe557319aa06c2 Christoph Hellwig             2020-06-17  163  			probe = copy_from_kernel_nofault(bounce, ptr, sz);
e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18 @164  			unxlate_dev_mem_ptr(p, ptr);
b5b38200ebe548 Kees Cook                     2018-03-27  165  			if (probe)
22ec1a2aea73b9 Kees Cook                     2017-12-01  166  				goto failed;
22ec1a2aea73b9 Kees Cook                     2017-12-01  167  
22ec1a2aea73b9 Kees Cook                     2017-12-01  168  			remaining = copy_to_user(buf, bounce, sz);
a4866aa812518e Kees Cook                     2017-04-05  169  		}
a4866aa812518e Kees Cook                     2017-04-05  170  
fa29e97bb8c70f Wu Fengguang                  2009-12-14  171  		if (remaining)
22ec1a2aea73b9 Kees Cook                     2017-12-01  172  			goto failed;
e045fb2a988a9a venkatesh.pallipadi@xxxxxxxxx 2008-03-18  173  
^1da177e4c3f41 Linus Torvalds                2005-04-16  174  		buf += sz;
^1da177e4c3f41 Linus Torvalds                2005-04-16  175  		p += sz;
^1da177e4c3f41 Linus Torvalds                2005-04-16  176  		count -= sz;
^1da177e4c3f41 Linus Torvalds                2005-04-16  177  		read += sz;
8619e5bdeee8b2 Tetsuo Handa                  2019-08-26  178  		if (should_stop_iteration())
8619e5bdeee8b2 Tetsuo Handa                  2019-08-26  179  			break;
^1da177e4c3f41 Linus Torvalds                2005-04-16  180  	}
22ec1a2aea73b9 Kees Cook                     2017-12-01  181  	kfree(bounce);
^1da177e4c3f41 Linus Torvalds                2005-04-16  182  
^1da177e4c3f41 Linus Torvalds                2005-04-16  183  	*ppos += read;
^1da177e4c3f41 Linus Torvalds                2005-04-16  184  	return read;
22ec1a2aea73b9 Kees Cook                     2017-12-01  185  
22ec1a2aea73b9 Kees Cook                     2017-12-01  186  failed:
22ec1a2aea73b9 Kees Cook                     2017-12-01  187  	kfree(bounce);
22ec1a2aea73b9 Kees Cook                     2017-12-01  188  	return err;
^1da177e4c3f41 Linus Torvalds                2005-04-16  189  }
^1da177e4c3f41 Linus Torvalds                2005-04-16  190  

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