Re: [PATCH v3 2/3] shmem: Introduce /sys/fs/tmpfs support

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Hi Gabriel,

url:    https://github.com/intel-lab-lkp/linux/commits/Gabriel-Krisman-Bertazi/shmem-Allow-userspace-monitoring-of-tmpfs-for-lack-of-space/20220419-054011
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b2d229d4ddb17db541098b83524d901257e93845
config: ia64-randconfig-m031-20220418 (https://download.01.org/0day-ci/archive/20220420/202204200819.72S8HjcF-lkp@xxxxxxxxx/config)
compiler: ia64-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
mm/shmem.c:3965 shmem_init() warn: passing zero to 'ERR_PTR'

vim +/ERR_PTR +3965 mm/shmem.c

41ffe5d5ceef7f Hugh Dickins            2011-08-03  3928  int __init shmem_init(void)
^1da177e4c3f41 Linus Torvalds          2005-04-16  3929  {
^1da177e4c3f41 Linus Torvalds          2005-04-16  3930  	int error;
^1da177e4c3f41 Linus Torvalds          2005-04-16  3931  
9a8ec03ed022b7 weiping zhang           2017-11-15  3932  	shmem_init_inodecache();
^1da177e4c3f41 Linus Torvalds          2005-04-16  3933  
41ffe5d5ceef7f Hugh Dickins            2011-08-03  3934  	error = register_filesystem(&shmem_fs_type);
^1da177e4c3f41 Linus Torvalds          2005-04-16  3935  	if (error) {
1170532bb49f94 Joe Perches             2016-03-17  3936  		pr_err("Could not register tmpfs\n");
^1da177e4c3f41 Linus Torvalds          2005-04-16  3937  		goto out2;
^1da177e4c3f41 Linus Torvalds          2005-04-16  3938  	}
95dc112a5770dc Greg Kroah-Hartman      2005-06-20  3939  
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3940  	shmem_root = kobject_create_and_add("tmpfs", fs_kobj);
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3941  	if (!shmem_root)
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3942  		goto out1;

error = -ENOMEM;

e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3943  
ca4e05195dbc25 Al Viro                 2013-08-31  3944  	shm_mnt = kern_mount(&shmem_fs_type);
^1da177e4c3f41 Linus Torvalds          2005-04-16  3945  	if (IS_ERR(shm_mnt)) {
^1da177e4c3f41 Linus Torvalds          2005-04-16  3946  		error = PTR_ERR(shm_mnt);
1170532bb49f94 Joe Perches             2016-03-17  3947  		pr_err("Could not kern_mount tmpfs\n");
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3948  		goto put_kobj;
^1da177e4c3f41 Linus Torvalds          2005-04-16  3949  	}
5a6e75f8110c97 Kirill A. Shutemov      2016-07-26  3950  
396bcc5299c281 Matthew Wilcox (Oracle  2020-04-06  3951) #ifdef CONFIG_TRANSPARENT_HUGEPAGE
435c0b87d661da Kirill A. Shutemov      2017-08-25  3952  	if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY)
5a6e75f8110c97 Kirill A. Shutemov      2016-07-26  3953  		SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge;
5a6e75f8110c97 Kirill A. Shutemov      2016-07-26  3954  	else
5e6e5a12a44ca5 Hugh Dickins            2021-09-02  3955  		shmem_huge = SHMEM_HUGE_NEVER; /* just in case it was patched */
5a6e75f8110c97 Kirill A. Shutemov      2016-07-26  3956  #endif
^1da177e4c3f41 Linus Torvalds          2005-04-16  3957  	return 0;
^1da177e4c3f41 Linus Torvalds          2005-04-16  3958  
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3959  put_kobj:
e43933b9793ad3 Gabriel Krisman Bertazi 2022-04-18  3960  	kobject_put(shmem_root);
^1da177e4c3f41 Linus Torvalds          2005-04-16  3961  out1:
41ffe5d5ceef7f Hugh Dickins            2011-08-03  3962  	unregister_filesystem(&shmem_fs_type);
^1da177e4c3f41 Linus Torvalds          2005-04-16  3963  out2:
41ffe5d5ceef7f Hugh Dickins            2011-08-03  3964  	shmem_destroy_inodecache();
^1da177e4c3f41 Linus Torvalds          2005-04-16 @3965  	shm_mnt = ERR_PTR(error);
^1da177e4c3f41 Linus Torvalds          2005-04-16  3966  	return error;
^1da177e4c3f41 Linus Torvalds          2005-04-16  3967  }

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





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