Hi Rishabh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.8-rc2 next-20200625]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Rishabh-Bhatnagar/Extend-coredump-functionality/20200624-092759
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e857ce6eae7ca21b2055cca4885545e29228fe2
config: h8300-randconfig-m031-20200624 (attached as .config)
compiler: h8300-linux-gcc (GCC) 9.3.0

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

smatch warnings:
drivers/remoteproc/remoteproc_coredump.c:186 rproc_coredump_read() warn: unsigned 'copy_sz' is never less than zero.

vim +/copy_sz +186 drivers/remoteproc/remoteproc_coredump.c

   171	
   172	static ssize_t rproc_coredump_read(char *buffer, loff_t offset, size_t count,
   173					   void *data, size_t header_sz)
   174	{
   175		size_t seg_data;
   176		size_t copy_sz, bytes_left = count;
   177		struct rproc_dump_segment *seg;
   178		struct rproc_coredump_state *dump_state = data;
   179		struct rproc *rproc = dump_state->rproc;
   180		void *elfcore = dump_state->header;
   181	
   182		/* Copy the vmalloc'ed header first. */
   183		if (offset < header_sz) {
   184			copy_sz = memory_read_from_buffer(buffer, count, &offset,
   185							  elfcore, header_sz);
 > 186			if (copy_sz < 0)
   187				return -EINVAL;
   188	
   189			return copy_sz;
   190		}
   191	
   192		/*
   193		 * Find out the segment memory chunk to be copied based on offset.
   194		 * Keep copying data until count bytes are read.
   195		 */
   196		while (bytes_left) {
   197			seg = rproc_coredump_find_segment(offset - header_sz,
   198							  &rproc->dump_segments,
   199							  &seg_data);
   200			/* EOF check */
   201			if (!seg) {
   202				dev_info(&rproc->dev, "Ramdump done, %lld bytes read",
   203					 offset);
   204				break;
   205			}
   206	
   207			copy_sz = min_t(size_t, bytes_left, seg_data);
   208	
   209			rproc_copy_segment(rproc, buffer, seg, seg->size - seg_data,
   210					   copy_sz);
   211	
   212			offset += copy_sz;
   213			buffer += copy_sz;
   214			bytes_left -= copy_sz;
   215		}
   216	
   217		return count - bytes_left;
   218	}
   219	

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