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Date: Mon, 14 Feb 2022 22:16:12 +0800
From: kernel test robot <lkp@...el.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: [jgunthorpe:iommufd 23/31]
drivers/iommu/iommufd/io_pagetable.c:488:6: error: comparison of distinct
pointer types ('typeof (iova) *' (aka 'unsigned long *') and 'typeof (length
- 1) *' (aka 'unsigned int *'))
tree: https://github.com/jgunthorpe/linux iommufd
head: 6b5b3f20ed6b64824c2d447b4f4555fcb390bf3b
commit: 01c5309803286f2c29a6f40bca7f489fce968c42 [23/31] iommufd: Data structure to provide IOVA to PFN mapping
config: i386-randconfig-a004-20220214 (https://download.01.org/0day-ci/archive/20220214/202202142244.2jylcKcV-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b)
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/jgunthorpe/linux/commit/01c5309803286f2c29a6f40bca7f489fce968c42
git remote add jgunthorpe https://github.com/jgunthorpe/linux
git fetch --no-tags jgunthorpe iommufd
git checkout 01c5309803286f2c29a6f40bca7f489fce968c42
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/iommu/iommufd/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
>> drivers/iommu/iommufd/io_pagetable.c:488:6: error: comparison of distinct pointer types ('typeof (iova) *' (aka 'unsigned long *') and 'typeof (length - 1) *' (aka 'unsigned int *')) [-Werror,-Wcompare-distinct-pointer-types]
if (check_add_overflow(iova, length - 1, &last_iova))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/overflow.h:66:15: note: expanded from macro 'check_add_overflow'
(void) (&__a == &__b); \
~~~~ ^ ~~~~
drivers/iommu/iommufd/io_pagetable.c:548:14: error: comparison of distinct pointer types ('typeof (iova) *' (aka 'unsigned long *') and 'typeof (length - 1) *' (aka 'unsigned int *')) [-Werror,-Wcompare-distinct-pointer-types]
WARN_ON(check_add_overflow(iova, length - 1, &last_iova)))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/overflow.h:66:15: note: expanded from macro 'check_add_overflow'
(void) (&__a == &__b); \
~~~~ ^ ~~~~
include/asm-generic/bug.h:121:25: note: expanded from macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^~~~~~~~~
2 errors generated.
vim +488 drivers/iommu/iommufd/io_pagetable.c
462
463 /**
464 * iopt_access_pages - Return a list of pages under the iova
465 *
466 * Reads @npages starting at iova and returns the struct page * pointers. These
467 * can be kmap'd by the caller for CPU access.
468 *
469 * The caller must perform iopt_unaccess_pages() when done to balance this.
470 *
471 * iova can be unaligned from PAGE_SIZE. The first returned byte starts at
472 * page_to_phys(out_pages[0]) + (iova % PAGE_SIZE). The caller promises not
473 * to touch memory outside the requested iova slice.
474 *
475 * FIXME: callers that need a DMA mapping via a sgl should create another
476 * interface to build the SGL efficiently
477 */
478 int iopt_access_pages(struct io_pagetable *iopt, unsigned long iova,
479 size_t length, struct page **out_pages, bool write)
480 {
481 unsigned long cur_iova = iova;
482 unsigned long last_iova;
483 struct iopt_area *area;
484 int rc;
485
486 if (!length)
487 return -EINVAL;
> 488 if (check_add_overflow(iova, length - 1, &last_iova))
489 return -EOVERFLOW;
490
491 down_read(&iopt->rwsem);
492 for (area = iopt_area_iter_first(iopt, iova, last_iova); area;
493 area = iopt_area_iter_next(area, iova, last_iova)) {
494 unsigned long last = min(last_iova, iopt_area_last_iova(area));
495 unsigned long last_index;
496 unsigned long index;
497
498 /* Need contiguous areas in the access */
499 if (iopt_area_iova(area) < cur_iova) {
500 rc = -EINVAL;
501 goto out_remove;
502 }
503
504 index = iopt_iova_to_index(area, cur_iova);
505 last_index = iopt_iova_to_index(area, last);
506 rc = iopt_pages_add_user(area->pages, index, last_index,
507 out_pages, write);
508 if (rc)
509 goto out_remove;
510 if (last == last_iova)
511 break;
512 /*
513 * Can't cross areas that are not aligned to the system page
514 * size with this API.
515 */
516 if (cur_iova % PAGE_SIZE) {
517 rc = -EINVAL;
518 goto out_remove;
519 }
520 cur_iova = last + 1;
521 out_pages += last_index - index;
522 atomic_inc(&area->num_users);
523 }
524
525 up_read(&iopt->rwsem);
526 return 0;
527
528 out_remove:
529 if (cur_iova != iova)
530 iopt_unaccess_pages(iopt, iova, cur_iova - iova);
531 return rc;
532 }
533
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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