linux-kernel - [kbuild] [gfs2:for-next 9/11] fs/gfs2/file.c:796:24: sparse: unsigned int *

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Message-ID: <202203170954.vFlMcTje-lkp@intel.com>
Date:   Thu, 17 Mar 2022 11:24:56 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...ts.01.org, Andreas Gruenbacher <agruenba@...hat.com>
Cc:     lkp@...el.com, kbuild-all@...ts.01.org, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [kbuild] [gfs2:for-next 9/11] fs/gfs2/file.c:796:24: sparse:
 unsigned int *

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git  for-next
head:   a20050c14edf19add5a9588cb196bb00aa410650
commit: 165d142ffacdef3e620819a1031df3d896aa29ab [9/11] gfs2: Fix should_fault_in_pages() logic
config: sh-randconfig-s032-20220313 (https://download.01.org/0day-ci/archive/20220317/202203170954.vFlMcTje-lkp@intel.com/config )
compiler: sh4-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross  -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/commit/?id=165d142ffacdef3e620819a1031df3d896aa29ab 
        git remote add gfs2 https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git 
        git fetch --no-tags gfs2 for-next
        git checkout 165d142ffacdef3e620819a1031df3d896aa29ab
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sh SHELL=/bin/bash fs/gfs2/

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

sparse warnings: (new ones prefixed by >>)
   fs/gfs2/file.c:796:24: sparse: sparse: incompatible types in comparison expression (different signedness):
>> fs/gfs2/file.c:796:24: sparse:    unsigned int *
   fs/gfs2/file.c:796:24: sparse:    int *
>> fs/gfs2/file.c:796:24: sparse: sparse: cannot size expression

vim +796 fs/gfs2/file.c

00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  773  static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i,
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  774  					 size_t *prev_count,
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  775  					 size_t *window_size)
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  776  {
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  777  	size_t count = iov_iter_count(i);
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  778  	size_t size, offs;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  779  
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  780  	if (likely(!count))
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  781  		return false;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  782  	if (ret <= 0 && ret != -EFAULT)
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  783  		return false;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  784  	if (!iter_is_iovec(i))
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  785  		return false;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  786  
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  787  	size = PAGE_SIZE;
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  788  	offs = offset_in_page(i->iov[0].iov_base + i->iov_offset);
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  789  	if (*prev_count != count || !*window_size) {
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  790  		int nr_dirtied;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  791  
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  792  		size = ALIGN(offs + count, PAGE_SIZE);
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  793  		size = min_t(size_t, size, SZ_1M);
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  794  		nr_dirtied = max(current->nr_dirtied_pause -
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  795  				 current->nr_dirtied, 8);
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07 @796  		size = min(size, nr_dirtied << PAGE_SHIFT);

size is size_t so nr_dirtied needs to be size_t as well.  I'm surprised
this compiles.  The min()/max() macros are supposed to trigger a compile
error for type mismatches.

00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  797  	}
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  798  
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  799  	*prev_count = count;
165d142ffacdef fs/gfs2/file.c     Andreas Gruenbacher 2022-03-07  800  	*window_size = size - offs;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  801  	return true;
00bfe02f479688 fs/gfs2/file.c     Andreas Gruenbacher 2021-10-18  802  }

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