[ammarfaizi2-block:dhowells/linux-fs/cifs-for-viro 5/8] fs/cifs/smb2ops.c:4785:11: 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-viro
head:   569e0acf4192ada33675e44b24701e679d87ebc9
commit: f398cb911105297654980b5973ff230323061fce [5/8] cifs: Change the I/O paths to use an iterator rather than a page list
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220708/202207081133.gqSVQ0Ct-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 562c3467a6738aa89203f72fc1d1343e5baadf3c)
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
        # https://github.com/ammarfaizi2/linux-block/commit/f398cb911105297654980b5973ff230323061fce
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/cifs-for-viro
        git checkout f398cb911105297654980b5973ff230323061fce
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/cifs/

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

All warnings (new ones prefixed by >>):

>> fs/cifs/smb2ops.c:4785:11: 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:4994:7: warning: variable 'length' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
                   if (rdata->result != 0) {
                       ^~~~~~~~~~~~~~~~~~
   fs/cifs/smb2ops.c:5026:9: note: uninitialized use occurs here
           return length;
                  ^~~~~~
   fs/cifs/smb2ops.c:4994:3: note: remove the 'if' if its condition is always true
                   if (rdata->result != 0) {
                   ^~~~~~~~~~~~~~~~~~~~~~~~
   fs/cifs/smb2ops.c:4893:12: note: initialize the variable 'length' to silence this warning
           int length;
                     ^
                      = 0
   2 warnings generated.


vim +4785 fs/cifs/smb2ops.c

  4735	
  4736	/*
  4737	 * This function will initialize new_rq and encrypt the content.
  4738	 * The first entry, new_rq[0], only contains a single iov which contains
  4739	 * a smb2_transform_hdr and is pre-allocated by the caller.
  4740	 * This function then populates new_rq[1+] with the content from olq_rq[0+].
  4741	 *
  4742	 * The end result is an array of smb_rqst structures where the first structure
  4743	 * only contains a single iov for the transform header which we then can pass
  4744	 * to crypt_message().
  4745	 *
  4746	 * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
  4747	 * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
  4748	 */
  4749	static int
  4750	smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
  4751			       struct smb_rqst *new_rq, struct smb_rqst *old_rq)
  4752	{
  4753		struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
  4754		struct page *page;
  4755		unsigned int orig_len = 0;
  4756		int i, j;
  4757		int rc = -ENOMEM;
  4758	
  4759		for (i = 1; i < num_rqst; i++) {
  4760			struct smb_rqst *old = &old_rq[i - 1];
  4761			struct smb_rqst *new = &new_rq[i];
  4762			struct xarray *buffer = &new->rq_buffer;
  4763			unsigned int npages;
  4764			size_t size = iov_iter_count(&old->rq_iter), seg, copied = 0;
  4765	
  4766			xa_init(buffer);
  4767	
  4768			if (size > 0) {
  4769				npages = DIV_ROUND_UP(size, PAGE_SIZE);
  4770				for (j = 0; j < npages; j++) {
  4771					void *o;
  4772	
  4773					rc = -ENOMEM;
  4774					page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
  4775					if (!page)
  4776						goto err_free;
  4777					page->index = j;
  4778					o = xa_store(buffer, j, page, GFP_KERNEL);
  4779					if (xa_is_err(o)) {
  4780						rc = xa_err(o);
  4781						put_page(page);
  4782						goto err_free;
  4783					}
  4784	
> 4785					seg = min(size - copied, PAGE_SIZE);
  4786					if (copy_page_from_iter(page, 0, seg, &old->rq_iter) != seg) {
  4787						rc = -EFAULT;
  4788						goto err_free;
  4789					}
  4790					copied += seg;
  4791				}
  4792				iov_iter_xarray(&new->rq_iter, iov_iter_rw(&old->rq_iter),
  4793						buffer, 0, size);
  4794			}
  4795			new->rq_iov = old->rq_iov;
  4796			new->rq_nvec = old->rq_nvec;
  4797			orig_len += smb_rqst_len(server, new);
  4798		}
  4799	
  4800		/* fill the 1st iov with a transform header */
  4801		fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
  4802	
  4803		rc = crypt_message(server, num_rqst, new_rq, 1);
  4804		cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
  4805		if (rc)
  4806			goto err_free;
  4807	
  4808		return rc;
  4809	
  4810	err_free:
  4811		smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
  4812		return rc;
  4813	}
  4814	

-- 
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