mm/cma.c:770:24-29: ERROR: iterator variable bound on line 768 cannot be NULL

BCC: [email protected]
CC: [email protected]
CC: [email protected]
TO: "Yury Norov (NVIDIA)" <[email protected]>
CC: Andrew Morton <[email protected]>
CC: Linux Memory Management List <[email protected]>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0d839570765118029aa8bf4a95444c6a11aacf85
commit: 77c50f9147eabcf726f62c73167bb9d9e8621a43 mm: cma: simplify cma_debug_show_areas()
date:   1 year ago
:::::: branch date: 19 hours ago
:::::: commit date: 1 year ago
config: x86_64-randconfig-101-20260806 (https://download.01.org/0day-ci/archive/20260806/[email protected]/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: 77c50f9147ea ("mm: cma: simplify cma_debug_show_areas()")
| Reported-by: kernel test robot <[email protected]>
| Reported-by: Julia Lawall <[email protected]>
| Closes: https://lore.kernel.org/r/[email protected]/

cocci warnings: (new ones prefixed by >>)
>> mm/cma.c:770:24-29: ERROR: iterator variable bound on line 768 cannot be NULL

vim +770 mm/cma.c

c009da4258f988 Frank van der Linden 2025-02-28  751  
dbe43d4d2837da Jaewon Kim           2017-02-24  752  static void cma_debug_show_areas(struct cma *cma)
dbe43d4d2837da Jaewon Kim           2017-02-24  753  {
77c50f9147eabc Yury Norov (NVIDIA   2025-07-19  754) 	unsigned long start, end;
7365ff2c8eef4e Frank van der Linden 2025-02-28  755  	unsigned long nr_part;
c009da4258f988 Frank van der Linden 2025-02-28  756  	unsigned long nbits;
c009da4258f988 Frank van der Linden 2025-02-28  757  	int r;
c009da4258f988 Frank van der Linden 2025-02-28  758  	struct cma_memrange *cmr;
dbe43d4d2837da Jaewon Kim           2017-02-24  759  
0ef7dcac998fef Mike Kravetz         2021-05-04  760  	spin_lock_irq(&cma->lock);
dbe43d4d2837da Jaewon Kim           2017-02-24  761  	pr_info("number of available pages: ");
c009da4258f988 Frank van der Linden 2025-02-28  762  	for (r = 0; r < cma->nranges; r++) {
c009da4258f988 Frank van der Linden 2025-02-28  763  		cmr = &cma->ranges[r];
c009da4258f988 Frank van der Linden 2025-02-28  764  
c009da4258f988 Frank van der Linden 2025-02-28  765  		nbits = cma_bitmap_maxno(cma, cmr);
c009da4258f988 Frank van der Linden 2025-02-28  766  
c009da4258f988 Frank van der Linden 2025-02-28  767  		pr_info("range %d: ", r);
77c50f9147eabc Yury Norov (NVIDIA   2025-07-19 @768) 		for_each_clear_bitrange(start, end, cmr->bitmap, nbits) {
77c50f9147eabc Yury Norov (NVIDIA   2025-07-19  769) 			nr_part = (end - start) << cma->order_per_bit;
77c50f9147eabc Yury Norov (NVIDIA   2025-07-19 @770) 			pr_cont("%s%lu@%lu", start ? "+" : "", nr_part, start);
dbe43d4d2837da Jaewon Kim           2017-02-24  771  		}
c009da4258f988 Frank van der Linden 2025-02-28  772  		pr_info("\n");
c009da4258f988 Frank van der Linden 2025-02-28  773  	}
7365ff2c8eef4e Frank van der Linden 2025-02-28  774  	pr_cont("=> %lu free of %lu total pages\n", cma->available_count,
7365ff2c8eef4e Frank van der Linden 2025-02-28  775  			cma->count);
0ef7dcac998fef Mike Kravetz         2021-05-04  776  	spin_unlock_irq(&cma->lock);
dbe43d4d2837da Jaewon Kim           2017-02-24  777  }
dbe43d4d2837da Jaewon Kim           2017-02-24  778  

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