tree: git://git.cmpxchg.org/linux-mmotm.git master
head: b99ef2cad77986ffd5818c8baeacef456d92e33d
commit: 8842588f1d870eb196bfdb7d9c3c64df1a691f20 [58/135] mm: remove vm_insert_mixed()
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 8842588f1d870eb196bfdb7d9c3c64df1a691f20
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=ia64
Note: the mmotm/master HEAD b99ef2cad77986ffd5818c8baeacef456d92e33d builds fine.
It only hurts bisectibility.
All errors (new ones prefixed by >>):
fs//cramfs/inode.c: In function 'cramfs_physmem_mmap':
>> fs//cramfs/inode.c:423:10: error: implicit declaration of function 'vm_insert_mixed'; did you mean 'vmf_insert_mixed'? [-Werror=implicit-function-declaration]
ret = vm_insert_mixed(vma, vma->vm_start + off, pfn);
^~~~~~~~~~~~~~~
vmf_insert_mixed
cc1: some warnings being treated as errors
vim +423 fs//cramfs/inode.c
eddcd976 Nicolas Pitre 2017-10-12 352
eddcd976 Nicolas Pitre 2017-10-12 353 static int cramfs_physmem_mmap(struct file *file, struct vm_area_struct *vma)
eddcd976 Nicolas Pitre 2017-10-12 354 {
eddcd976 Nicolas Pitre 2017-10-12 355 struct inode *inode = file_inode(file);
eddcd976 Nicolas Pitre 2017-10-12 356 struct cramfs_sb_info *sbi = CRAMFS_SB(inode->i_sb);
eddcd976 Nicolas Pitre 2017-10-12 357 unsigned int pages, max_pages, offset;
eddcd976 Nicolas Pitre 2017-10-12 358 unsigned long address, pgoff = vma->vm_pgoff;
eddcd976 Nicolas Pitre 2017-10-12 359 char *bailout_reason;
eddcd976 Nicolas Pitre 2017-10-12 360 int ret;
eddcd976 Nicolas Pitre 2017-10-12 361
eddcd976 Nicolas Pitre 2017-10-12 362 ret = generic_file_readonly_mmap(file, vma);
eddcd976 Nicolas Pitre 2017-10-12 363 if (ret)
eddcd976 Nicolas Pitre 2017-10-12 364 return ret;
eddcd976 Nicolas Pitre 2017-10-12 365
eddcd976 Nicolas Pitre 2017-10-12 366 /*
eddcd976 Nicolas Pitre 2017-10-12 367 * Now try to pre-populate ptes for this vma with a direct
eddcd976 Nicolas Pitre 2017-10-12 368 * mapping avoiding memory allocation when possible.
eddcd976 Nicolas Pitre 2017-10-12 369 */
eddcd976 Nicolas Pitre 2017-10-12 370
eddcd976 Nicolas Pitre 2017-10-12 371 /* Could COW work here? */
eddcd976 Nicolas Pitre 2017-10-12 372 bailout_reason = "vma is writable";
eddcd976 Nicolas Pitre 2017-10-12 373 if (vma->vm_flags & VM_WRITE)
eddcd976 Nicolas Pitre 2017-10-12 374 goto bailout;
eddcd976 Nicolas Pitre 2017-10-12 375
eddcd976 Nicolas Pitre 2017-10-12 376 max_pages = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
eddcd976 Nicolas Pitre 2017-10-12 377 bailout_reason = "beyond file limit";
eddcd976 Nicolas Pitre 2017-10-12 378 if (pgoff >= max_pages)
eddcd976 Nicolas Pitre 2017-10-12 379 goto bailout;
eddcd976 Nicolas Pitre 2017-10-12 380 pages = min(vma_pages(vma), max_pages - pgoff);
eddcd976 Nicolas Pitre 2017-10-12 381
eddcd976 Nicolas Pitre 2017-10-12 382 offset = cramfs_get_block_range(inode, pgoff, &pages);
eddcd976 Nicolas Pitre 2017-10-12 383 bailout_reason = "unsuitable block layout";
eddcd976 Nicolas Pitre 2017-10-12 384 if (!offset)
eddcd976 Nicolas Pitre 2017-10-12 385 goto bailout;
eddcd976 Nicolas Pitre 2017-10-12 386 address = sbi->linear_phys_addr + offset;
eddcd976 Nicolas Pitre 2017-10-12 387 bailout_reason = "data is not page aligned";
eddcd976 Nicolas Pitre 2017-10-12 388 if (!PAGE_ALIGNED(address))
eddcd976 Nicolas Pitre 2017-10-12 389 goto bailout;
eddcd976 Nicolas Pitre 2017-10-12 390
eddcd976 Nicolas Pitre 2017-10-12 391 /* Don't map the last page if it contains some other data */
eddcd976 Nicolas Pitre 2017-10-12 392 if (pgoff + pages == max_pages && cramfs_last_page_is_shared(inode)) {
eddcd976 Nicolas Pitre 2017-10-12 393 pr_debug("mmap: %s: last page is shared\n",
eddcd976 Nicolas Pitre 2017-10-12 394 file_dentry(file)->d_name.name);
eddcd976 Nicolas Pitre 2017-10-12 395 pages--;
eddcd976 Nicolas Pitre 2017-10-12 396 }
eddcd976 Nicolas Pitre 2017-10-12 397
eddcd976 Nicolas Pitre 2017-10-12 398 if (!pages) {
eddcd976 Nicolas Pitre 2017-10-12 399 bailout_reason = "no suitable block remaining";
eddcd976 Nicolas Pitre 2017-10-12 400 goto bailout;
eddcd976 Nicolas Pitre 2017-10-12 401 }
eddcd976 Nicolas Pitre 2017-10-12 402
eddcd976 Nicolas Pitre 2017-10-12 403 if (pages == vma_pages(vma)) {
eddcd976 Nicolas Pitre 2017-10-12 404 /*
eddcd976 Nicolas Pitre 2017-10-12 405 * The entire vma is mappable. remap_pfn_range() will
eddcd976 Nicolas Pitre 2017-10-12 406 * make it distinguishable from a non-direct mapping
eddcd976 Nicolas Pitre 2017-10-12 407 * in /proc/<pid>/maps by substituting the file offset
eddcd976 Nicolas Pitre 2017-10-12 408 * with the actual physical address.
eddcd976 Nicolas Pitre 2017-10-12 409 */
eddcd976 Nicolas Pitre 2017-10-12 410 ret = remap_pfn_range(vma, vma->vm_start, address >> PAGE_SHIFT,
eddcd976 Nicolas Pitre 2017-10-12 411 pages * PAGE_SIZE, vma->vm_page_prot);
eddcd976 Nicolas Pitre 2017-10-12 412 } else {
eddcd976 Nicolas Pitre 2017-10-12 413 /*
eddcd976 Nicolas Pitre 2017-10-12 414 * Let's create a mixed map if we can't map it all.
eddcd976 Nicolas Pitre 2017-10-12 415 * The normal paging machinery will take care of the
eddcd976 Nicolas Pitre 2017-10-12 416 * unpopulated ptes via cramfs_readpage().
eddcd976 Nicolas Pitre 2017-10-12 417 */
eddcd976 Nicolas Pitre 2017-10-12 418 int i;
eddcd976 Nicolas Pitre 2017-10-12 419 vma->vm_flags |= VM_MIXEDMAP;
eddcd976 Nicolas Pitre 2017-10-12 420 for (i = 0; i < pages && !ret; i++) {
eddcd976 Nicolas Pitre 2017-10-12 421 unsigned long off = i * PAGE_SIZE;
eddcd976 Nicolas Pitre 2017-10-12 422 pfn_t pfn = phys_to_pfn_t(address + off, PFN_DEV);
eddcd976 Nicolas Pitre 2017-10-12 @423 ret = vm_insert_mixed(vma, vma->vm_start + off, pfn);
eddcd976 Nicolas Pitre 2017-10-12 424 }
eddcd976 Nicolas Pitre 2017-10-12 425 }
eddcd976 Nicolas Pitre 2017-10-12 426
eddcd976 Nicolas Pitre 2017-10-12 427 if (!ret)
eddcd976 Nicolas Pitre 2017-10-12 428 pr_debug("mapped %s[%lu] at 0x%08lx (%u/%lu pages) "
eddcd976 Nicolas Pitre 2017-10-12 429 "to vma 0x%08lx, page_prot 0x%llx\n",
eddcd976 Nicolas Pitre 2017-10-12 430 file_dentry(file)->d_name.name, pgoff,
eddcd976 Nicolas Pitre 2017-10-12 431 address, pages, vma_pages(vma), vma->vm_start,
eddcd976 Nicolas Pitre 2017-10-12 432 (unsigned long long)pgprot_val(vma->vm_page_prot));
eddcd976 Nicolas Pitre 2017-10-12 433 return ret;
eddcd976 Nicolas Pitre 2017-10-12 434
eddcd976 Nicolas Pitre 2017-10-12 435 bailout:
eddcd976 Nicolas Pitre 2017-10-12 436 pr_debug("%s[%lu]: direct mmap impossible: %s\n",
eddcd976 Nicolas Pitre 2017-10-12 437 file_dentry(file)->d_name.name, pgoff, bailout_reason);
eddcd976 Nicolas Pitre 2017-10-12 438 /* Didn't manage any direct map, but normal paging is still possible */
eddcd976 Nicolas Pitre 2017-10-12 439 return 0;
eddcd976 Nicolas Pitre 2017-10-12 440 }
eddcd976 Nicolas Pitre 2017-10-12 441
:::::: The code at line 423 was first introduced by commit
:::::: eddcd97659e31f59fc99c6c3ca3dcce403585f7e cramfs: add mmap support
:::::: TO: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>
:::::: CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
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