[ammarfaizi2-block:dhowells/linux-fs/cifs-for-sfrench 5/6] fs/cifs/smb2ops.c:4752:11: warning: comparison of distinct pointer types ('typeof (size - copied) *' (aka 'unsigned int *') and 'typeof (((1UL) << (12))) *' (aka 'unsigned long *'))

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/cifs-for-sfrench
head:   627ce4da99bb612945366770c5604019fb74b653
commit: e4b60df6a12099568c671591d36a9fa16515f6eb [5/6] cifs: Change the I/O paths to use an iterator rather than a page list
config: riscv-randconfig-c006-20220510 (https://download.01.org/0day-ci/archive/20220513/202205132109.23GgU6Kd-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 18dd123c56754edf62c7042dcf23185c3727610f)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/e4b60df6a12099568c671591d36a9fa16515f6eb
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/cifs-for-sfrench
        git checkout e4b60df6a12099568c671591d36a9fa16515f6eb
        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 

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 >>):

>> fs/cifs/smb2ops.c:4752:11: warning: comparison of distinct pointer types ('typeof (size - copied) *' (aka 'unsigned int *') and 'typeof (((1UL) << (12))) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
                                   seg = min(size - copied, PAGE_SIZE);
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:45:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   fs/cifs/smb2ops.c:4961:7: warning: variable 'length' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
                   if (rdata->result != 0) {
                       ^~~~~~~~~~~~~~~~~~
   fs/cifs/smb2ops.c:4993:9: note: uninitialized use occurs here
           return length;
                  ^~~~~~
   fs/cifs/smb2ops.c:4961:3: note: remove the 'if' if its condition is always true
                   if (rdata->result != 0) {
                   ^~~~~~~~~~~~~~~~~~~~~~~~
   fs/cifs/smb2ops.c:4860:12: note: initialize the variable 'length' to silence this warning
           int length;
                     ^
                      = 0
   2 warnings generated.


vim +4752 fs/cifs/smb2ops.c

  4702	
  4703	/*
  4704	 * This function will initialize new_rq and encrypt the content.
  4705	 * The first entry, new_rq[0], only contains a single iov which contains
  4706	 * a smb2_transform_hdr and is pre-allocated by the caller.
  4707	 * This function then populates new_rq[1+] with the content from olq_rq[0+].
  4708	 *
  4709	 * The end result is an array of smb_rqst structures where the first structure
  4710	 * only contains a single iov for the transform header which we then can pass
  4711	 * to crypt_message().
  4712	 *
  4713	 * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
  4714	 * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
  4715	 */
  4716	static int
  4717	smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
  4718			       struct smb_rqst *new_rq, struct smb_rqst *old_rq)
  4719	{
  4720		struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
  4721		struct page *page;
  4722		unsigned int orig_len = 0;
  4723		int i, j;
  4724		int rc = -ENOMEM;
  4725	
  4726		for (i = 1; i < num_rqst; i++) {
  4727			struct smb_rqst *old = &old_rq[i - 1];
  4728			struct smb_rqst *new = &new_rq[i];
  4729			struct xarray *buffer = &new->rq_buffer;
  4730			unsigned int npages;
  4731			size_t size = iov_iter_count(&old->rq_iter), seg, copied = 0;
  4732	
  4733			xa_init(buffer);
  4734	
  4735			if (size > 0) {
  4736				npages = DIV_ROUND_UP(size, PAGE_SIZE);
  4737				for (j = 0; j < npages; j++) {
  4738					void *o;
  4739	
  4740					rc = -ENOMEM;
  4741					page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
  4742					if (!page)
  4743						goto err_free;
  4744					page->index = j;
  4745					o = xa_store(buffer, j, page, GFP_KERNEL);
  4746					if (xa_is_err(o)) {
  4747						rc = xa_err(o);
  4748						put_page(page);
  4749						goto err_free;
  4750					}
  4751	
> 4752					seg = min(size - copied, PAGE_SIZE);
  4753					if (copy_page_from_iter(page, 0, seg, &old->rq_iter) != seg) {
  4754						rc = -EFAULT;
  4755						goto err_free;
  4756					}
  4757					copied += seg;
  4758				}
  4759				iov_iter_xarray(&new->rq_iter, iov_iter_rw(&old->rq_iter),
  4760						buffer, 0, size);
  4761			}
  4762			new->rq_iov = old->rq_iov;
  4763			new->rq_nvec = old->rq_nvec;
  4764			orig_len += smb_rqst_len(server, new);
  4765		}
  4766	
  4767		/* fill the 1st iov with a transform header */
  4768		fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
  4769	
  4770		rc = crypt_message(server, num_rqst, new_rq, 1);
  4771		cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
  4772		if (rc)
  4773			goto err_free;
  4774	
  4775		return rc;
  4776	
  4777	err_free:
  4778		smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
  4779		return rc;
  4780	}
  4781	

-- 
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