[vfs:untested.iov_iter-2 2/30] lib/iov_iter.c:925:5: warning: comparison of distinct pointer types ('typeof (bytes) (aka 'unsigned int and 'typeof (((1UL) << 14) - offset) (aka 'unsigned long

[vfs:untested.iov_iter-2 2/30] lib/iov_iter.c:925:5: warning: comparison of distinct pointer types ('typeof (bytes) (aka 'unsigned int and 'typeof (((1UL) << 14) - offset) (aka 'unsigned long

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git untested.iov_iter-2
head:   5fe048dcff7837bcf95ef3c4f73fb230153a388b
commit: d2e019de6652bdd76006fab8b125f543c431e724 [2/30] teach copy_page_to_iter() to handle compound pages
config: mips-randconfig-r006-20210503 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/commit/?id=d2e019de6652bdd76006fab8b125f543c431e724
        git remote add vfs https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git
        git fetch --no-tags vfs untested.iov_iter-2
        git checkout d2e019de6652bdd76006fab8b125f543c431e724
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> lib/iov_iter.c:925:5: warning: comparison of distinct pointer types ('typeof (bytes) (aka 'unsigned int and 'typeof (((1UL) << 14) - offset) (aka 'unsigned long
   min(bytes, PAGE_SIZE - offset), i);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:51:19: note: expanded from macro 'min'
   #define min(x, y) __careful_cmp(x, y, <)
   ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:42:24: note: expanded from macro '__careful_cmp'
   __builtin_choose_expr(__safe_cmp(x, y), ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:32:4: note: expanded from macro '__safe_cmp'
   (__typecheck(x, y) && __no_side_effects(x, y))
   ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:18:28: note: expanded from macro '__typecheck'
   == (typeof(y)
   ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
   fatal error: error in backend: Nested variants found in inline asm string: ' .set push
   .set mips64r2
   .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 153, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $1 # atomic_add
   addu $0, $2
   sc $0, $1
   beqz $0, 1b
   .set pop
   '
   clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 13.0.0 (git://gitmirror/llvm_project 8f5a2a5836cc8e4c1def2bdeb022e7b496623439)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-8f5a2a5836/bin
   clang-13: note: diagnostic msg:
   Makefile arch block certs crypto drivers fs include init ipc kernel lib mm scripts security sound source usr virt


vim +925 lib/iov_iter.c

   914	
   915	size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
   916				 struct iov_iter *i)
   917	{
   918		size_t res = 0;
   919		if (unlikely(!page_copy_sane(page, offset, bytes)))
   920			return 0;
   921		page += offset / PAGE_SIZE; // first subpage
   922		offset %= PAGE_SIZE;
   923		while (1) {
   924			size_t n = __copy_page_to_iter(page, offset,
 > 925					min(bytes, PAGE_SIZE - offset), i);
   926			res += n;
   927			bytes -= n;
   928			if (!bytes || !n)
   929				break;
   930			offset += n;
   931			if (offset == PAGE_SIZE) {
   932				page++;
   933				offset = 0;
   934			}
   935		}
   936		return res;
   937	}
   938	EXPORT_SYMBOL(copy_page_to_iter);
   939	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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