linux-kernel - [ammarfaizi2-block:dhowells/linux-fs/netfs-linked-list 39/45] fs/netfs/buffered_write.c:669:13: sparse: sparse: incorrect type in assignment (different base types)

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Date:   Thu, 28 Apr 2022 17:27:02 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:dhowells/linux-fs/netfs-linked-list 39/45]
 fs/netfs/buffered_write.c:669:13: sparse: sparse: incorrect type in
 assignment (different base types)

tree:   https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-linked-list
head:   a20ca5707a9b524115f5ded439fed1f8e552dd6b
commit: 95f517db4cb2fbcfdabe76d0be06d75746958b0b [39/45] netfs: Allow buffered shared-writeable mmap through netfs_page_mkwrite()
config: s390-randconfig-s032-20220428 (https://download.01.org/0day-ci/archive/20220428/202204281739.ZRJW1o8Z-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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://github.com/ammarfaizi2/linux-block/commit/95f517db4cb2fbcfdabe76d0be06d75746958b0b
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-linked-list
        git checkout 95f517db4cb2fbcfdabe76d0be06d75746958b0b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

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/netfs/buffered_write.c:669:13: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted vm_fault_t [usertype] ret @@     got int @@
   fs/netfs/buffered_write.c:669:13: sparse:     expected restricted vm_fault_t [usertype] ret
   fs/netfs/buffered_write.c:669:13: sparse:     got int
>> fs/netfs/buffered_write.c:670:13: sparse: sparse: restricted vm_fault_t degrades to integer

vim +669 fs/netfs/buffered_write.c

   640	
   641	/*
   642	 * Notification that a previously read-only page is about to become writable.
   643	 * Note that the caller indicates a single page of a multipage folio.
   644	 */
   645	vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf)
   646	{
   647		struct netfs_dirty_region *region;
   648		struct folio *folio = page_folio(vmf->page);
   649		struct file *file = vmf->vma->vm_file;
   650		struct inode *inode = file_inode(file);
   651		struct netfs_i_context *ctx = netfs_i_context(inode);
   652		vm_fault_t ret = VM_FAULT_RETRY;
   653		int err;
   654		LIST_HEAD(spare_regions);
   655	
   656		_enter("%lx", folio->index);
   657	
   658		if (ctx->ops->validate_for_write(inode, file) < 0)
   659			return VM_FAULT_SIGBUS;
   660	
   661		sb_start_pagefault(inode->i_sb);
   662	
   663		if (folio_wait_writeback_killable(folio))
   664			goto out;
   665	
   666		if (folio_lock_killable(folio) < 0)
   667			goto out;
   668	
 > 669		ret = netfs_preallocate_regions(&spare_regions);
 > 670		if (ret < 0) {

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp