tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 2a860505b617cf8fda4ebff6cf05d3f774145440 commit: ad999eeb01ea4bd5c667d80e5c2cea4ef9c47e3e [10184/10591] mm/gup: introduce pin_user_pages_fd() for pinning shmem/hugetlbfs file pages config: i386-randconfig-141-20231008 (https://download.01.org/0day-ci/archive/20231010/202310100409.LrBAYpmk-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce: (https://download.01.org/0day-ci/archive/20231010/202310100409.LrBAYpmk-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/202310100409.LrBAYpmk-lkp@xxxxxxxxx/ smatch warnings: mm/gup.c:3446 pin_user_pages_fd() warn: unsigned 'start' is never less than zero. vim +/start +3446 mm/gup.c 3413 3414 /** 3415 * pin_user_pages_fd() - pin user pages associated with a file 3416 * @fd: the fd whose pages are to be pinned 3417 * @start: starting file offset 3418 * @nr_pages: number of pages from start to pin 3419 * @gup_flags: flags modifying pin behaviour 3420 * @pages: array that receives pointers to the pages pinned. 3421 * Should be at least nr_pages long. 3422 * 3423 * Attempt to pin (and migrate) pages associated with a file belonging to 3424 * either shmem or hugetlbfs. An error is returned if pages associated with 3425 * hugetlbfs files are not present in the page cache. However, shmem pages 3426 * are swapped in or allocated if they are not present in the page cache. 3427 * 3428 * Returns number of pages pinned. This would be equal to the number of 3429 * pages requested. 3430 * If nr_pages is 0 or negative, returns 0. If no pages were pinned, returns 3431 * -errno. 3432 */ 3433 long pin_user_pages_fd(int fd, pgoff_t start, unsigned long nr_pages, 3434 unsigned int gup_flags, struct page **pages) 3435 { 3436 struct page *page; 3437 struct file *filep; 3438 unsigned int flags, i; 3439 long ret; 3440 3441 if (nr_pages <= 0) 3442 return 0; 3443 if (!is_valid_gup_args(pages, NULL, &gup_flags, FOLL_PIN)) 3444 return 0; 3445 > 3446 if (start < 0) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
