tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable head: 75ac3c8cee9c94691bc9001fcfb6214ae812bfa8 commit: f40b24c7c416b304b93115d66d02dc54e5d2f7d1 [209/215] mm/mmap: change detached vma locking scheme config: um-allnoconfig (https://download.01.org/0day-ci/archive/20230718/202307180750.Dk6xL6nG-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce: (https://download.01.org/0day-ci/archive/20230718/202307180750.Dk6xL6nG-lkp@xxxxxxxxx/reproduce) 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 | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202307180750.Dk6xL6nG-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): In file included from mm/mmap.c:14: In file included from include/linux/backing-dev.h:16: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 547 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ In file included from mm/mmap.c:14: In file included from include/linux/backing-dev.h:16: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ In file included from mm/mmap.c:14: In file included from include/linux/backing-dev.h:16: In file included from include/linux/writeback.h:13: In file included from include/linux/blk_types.h:10: In file included from include/linux/bvec.h:10: In file included from include/linux/highmem.h:12: In file included from include/linux/hardirq.h:11: In file included from arch/um/include/asm/hardirq.h:5: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/um/include/asm/io.h:24: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 584 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 692 | readsb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 700 | readsw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 708 | readsl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 717 | writesb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 726 | writesw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 735 | writesl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ >> mm/mmap.c:2430:29: error: assigning to 'lockdep_map_p' from incompatible type 'void *' 2430 | mt_detach.ma_external_lock = NULL; | ^ ~~~~ 12 warnings and 1 error generated. vim +2430 mm/mmap.c 2403 2404 /* 2405 * do_vmi_align_munmap() - munmap the aligned region from @start to @end. 2406 * @vmi: The vma iterator 2407 * @vma: The starting vm_area_struct 2408 * @mm: The mm_struct 2409 * @start: The aligned start address to munmap. 2410 * @end: The aligned end address to munmap. 2411 * @uf: The userfaultfd list_head 2412 * @unlock: Set to true to drop the mmap_lock. unlocking only happens on 2413 * success. 2414 * 2415 * Return: 0 on success and drops the lock if so directed, error and leaves the 2416 * lock held otherwise. 2417 */ 2418 static int 2419 do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, 2420 struct mm_struct *mm, unsigned long start, 2421 unsigned long end, struct list_head *uf, bool unlock) 2422 { 2423 struct vm_area_struct *prev, *next = NULL; 2424 struct maple_tree mt_detach; 2425 int count = 0; 2426 int error = -ENOMEM; 2427 unsigned long locked_vm = 0; 2428 MA_STATE(mas_detach, &mt_detach, 0, 0); 2429 mt_init_flags(&mt_detach, vmi->mas.tree->ma_flags & MT_FLAGS_LOCK_MASK); > 2430 mt_detach.ma_external_lock = NULL; 2431 2432 /* 2433 * If we need to split any vma, do it now to save pain later. 2434 * 2435 * Note: mremap's move_vma VM_ACCOUNT handling assumes a partially 2436 * unmapped vm_area_struct will remain in use: so lower split_vma 2437 * places tmp vma above, and higher split_vma places tmp vma below. 2438 */ 2439 2440 /* Does it split the first one? */ 2441 if (start > vma->vm_start) { 2442 2443 /* 2444 * Make sure that map_count on return from munmap() will 2445 * not exceed its limit; but let map_count go just above 2446 * its limit temporarily, to help free resources as expected. 2447 */ 2448 if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count) 2449 goto map_count_exceeded; 2450 2451 error = __split_vma(vmi, vma, start, 0); 2452 if (error) 2453 goto start_split_failed; 2454 2455 vma = vma_iter_load(vmi); 2456 } 2457 2458 prev = vma_prev(vmi); 2459 if (unlikely((!prev))) 2460 vma_iter_set(vmi, start); 2461 2462 /* 2463 * Detach a range of VMAs from the mm. Using next as a temp variable as 2464 * it is always overwritten. 2465 */ 2466 for_each_vma_range(*vmi, next, end) { 2467 /* Does it split the end? */ 2468 if (next->vm_end > end) { 2469 error = __split_vma(vmi, next, end, 0); 2470 if (error) 2471 goto end_split_failed; 2472 } 2473 vma_start_write(next); 2474 mas_set_range(&mas_detach, next->vm_start, next->vm_end - 1); 2475 error = mas_store_gfp(&mas_detach, next, GFP_KERNEL); 2476 if (error) 2477 goto munmap_gather_failed; 2478 vma_mark_detached(next, true); 2479 if (next->vm_flags & VM_LOCKED) 2480 locked_vm += vma_pages(next); 2481 2482 count++; 2483 if (unlikely(uf)) { 2484 /* 2485 * If userfaultfd_unmap_prep returns an error the vmas 2486 * will remain split, but userland will get a 2487 * highly unexpected error anyway. This is no 2488 * different than the case where the first of the two 2489 * __split_vma fails, but we don't undo the first 2490 * split, despite we could. This is unlikely enough 2491 * failure that it's not worth optimizing it for. 2492 */ 2493 error = userfaultfd_unmap_prep(next, start, end, uf); 2494 2495 if (error) 2496 goto userfaultfd_error; 2497 } 2498 #ifdef CONFIG_DEBUG_VM_MAPLE_TREE 2499 BUG_ON(next->vm_start < start); 2500 BUG_ON(next->vm_start > end); 2501 #endif 2502 } 2503 2504 if (vma_iter_end(vmi) > end) 2505 next = vma_iter_load(vmi); 2506 2507 if (!next) 2508 next = vma_next(vmi); 2509 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
