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spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 09, 2025 at 05:41:44PM +0800, kernel test robot wrote: > Hi Lorenzo, > > kernel test robot noticed the following build warnings: > > [auto build test WARNING on akpm-mm/mm-everything] > [cannot apply to brauner-vfs/vfs.all char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus s390/features lwn/docs-next linus/master v6.17-rc5 next-20250909] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use '--base' as documented in > https://git-scm.com/docs/git-format-patch#_base_tree_information] > > url: https://github.com/intel-lab-lkp/linux/commits/Lorenzo-Stoakes/mm-shmem-update-shmem-to-use-mmap_prepare/20250908-191516 > base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything > patch link: https://lore.kernel.org/r/e2fb74b295b60bcb591aba5cc521cbe1b7901cd3.1757329751.git.lorenzo.stoakes%40oracle.com > patch subject: [PATCH 13/16] mm: update cramfs to use mmap_prepare, mmap_complete > config: arm64-randconfig-001-20250909 (https://download.01.org/0day-ci/archive/20250909/202509091758.mKPE6Hs0-lkp@intel.com/config) > compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6) > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250909/202509091758.mKPE6Hs0-lkp@intel.com/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 > | Closes: https://lore.kernel.org/oe-kbuild-all/202509091758.mKPE6Hs0-lkp@intel.com/ > > All warnings (new ones prefixed by >>): > > In file included from fs/cramfs/inode.c:19: > In file included from include/linux/pagemap.h:8: > In file included from include/linux/mm.h:1096: > include/linux/huge_mm.h:591:16: warning: unused variable 'folio' [-Wunused-variable] > struct folio *folio = page_folio(page); > ^ > include/linux/huge_mm.h:598:16: warning: unused variable 'folio' [-Wunused-variable] > struct folio *folio = page_folio(page); > ^ (unrelated to series) > >> fs/cramfs/inode.c:358:38: warning: cast to smaller integer type 'enum cramfs_mmap_state' from 'const void *' [-Wvoid-pointer-to-enum-cast] > enum cramfs_mmap_state mmap_state = (enum cramfs_mmap_state)context; > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ack yeah, I'm going to try to refactor this without passing this around. If not then I will do the appropriate cast dance. Thanks, Lorenzo > 3 warnings generated. > > > vim +358 fs/cramfs/inode.c > > 350 > 351 static int cramfs_physmem_mmap_complete(struct file *file, struct vm_area_struct *vma, > 352 const void *context) > 353 { > 354 struct inode *inode = file_inode(file); > 355 struct cramfs_sb_info *sbi = CRAMFS_SB(inode->i_sb); > 356 unsigned long address, pgoff = vma->vm_pgoff; > 357 unsigned int pages, offset; > > 358 enum cramfs_mmap_state mmap_state = (enum cramfs_mmap_state)context; > 359 int ret = 0; > 360 > 361 if (mmap_state == NO_PREPOPULATE) > 362 return 0; > 363 > 364 offset = cramfs_get_block_range(inode, pgoff, &pages); > 365 address = sbi->linear_phys_addr + offset; > 366 > 367 /* > 368 * Now try to pre-populate ptes for this vma with a direct > 369 * mapping avoiding memory allocation when possible. > 370 */ > 371 > 372 if (mmap_state == PREPOPULATE_PFNMAP) { > 373 /* > 374 * The entire vma is mappable. remap_pfn_range() will > 375 * make it distinguishable from a non-direct mapping > 376 * in /proc//maps by substituting the file offset > 377 * with the actual physical address. > 378 */ > 379 ret = remap_pfn_range_complete(vma, vma->vm_start, address >> PAGE_SHIFT, > 380 pages * PAGE_SIZE, vma->vm_page_prot); > 381 } else { > 382 /* > 383 * Let's create a mixed map if we can't map it all. > 384 * The normal paging machinery will take care of the > 385 * unpopulated ptes via cramfs_read_folio(). > 386 */ > 387 int i; > 388 > 389 for (i = 0; i < pages && !ret; i++) { > 390 vm_fault_t vmf; > 391 unsigned long off = i * PAGE_SIZE; > 392 > 393 vmf = vmf_insert_mixed(vma, vma->vm_start + off, > 394 address + off); > 395 if (vmf & VM_FAULT_ERROR) > 396 ret = vm_fault_to_errno(vmf, 0); > 397 } > 398 } > 399 > 400 if (!ret) > 401 pr_debug("mapped %pD[%lu] at 0x%08lx (%u/%lu pages) " > 402 "to vma 0x%08lx, page_prot 0x%llx\n", file, > 403 pgoff, address, pages, vma_pages(vma), vma->vm_start, > 404 (unsigned long long)pgprot_val(vma->vm_page_prot)); > 405 return ret; > 406 } > 407 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki