[akpm-mm:mm-stable 219/240] mm/memory.c:5410:34: error: call to undeclared function 'vma_is_tcp'; ISO C99 and later do not support implicit function declarations

kernel test robot
2023-08-12T11:40:15Z

tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-stable
head: 5fb2ea3111f4ecc6dc4891ce5b00f0217aae9a04
commit: 4aaa60dad4d1c96151dec51098aed866bb6e867d [219/240] mm: allow per-VMA locks on file-backed VMAs
config: s390-randconfig-r044-20230812 (https://download.01.org/0day-ci/archive/20230812/202308121909.XNYBtqNI-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230812/202308121909.XNYBtqNI-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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308121909.XNYBtqNI-lkp@intel.com/

All errors (new ones prefixed by >>):

In file included from mm/memory.c:83:
In file included from arch/s390/include/asm/io.h:78:
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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from mm/memory.c:83:
In file included from arch/s390/include/asm/io.h:78:
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/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from mm/memory.c:83:
In file included from arch/s390/include/asm/io.h:78:
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/memory.c:5410:34: error: call to undeclared function 'vma_is_tcp'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
5410 | if (unlikely(!vma->anon_vma && !vma_is_tcp(vma)))
| ^
mm/memory.c:5410:34: note: did you mean 'vma_is_dax'?
include/linux/fs.h:2990:20: note: 'vma_is_dax' declared here
2990 | static inline bool vma_is_dax(const struct vm_area_struct *vma)
| ^
12 warnings and 1 error generated.

vim +/vma_is_tcp +5410 mm/memory.c

c2508ec5a58db6 Linus Torvalds 2023-06-15 5382
50ee3253720614 Suren Baghdasaryan 2023-02-27 5383 #ifdef CONFIG_PER_VMA_LOCK
50ee3253720614 Suren Baghdasaryan 2023-02-27 5384 /*
50ee3253720614 Suren Baghdasaryan 2023-02-27 5385 * Lookup and lock a VMA under RCU protection. Returned VMA is guaranteed to be
50ee3253720614 Suren Baghdasaryan 2023-02-27 5386 * stable and not isolated. If the VMA is not found or is being modified the
50ee3253720614 Suren Baghdasaryan 2023-02-27 5387 * function returns NULL.
50ee3253720614 Suren Baghdasaryan 2023-02-27 5388 */
50ee3253720614 Suren Baghdasaryan 2023-02-27 5389 struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
50ee3253720614 Suren Baghdasaryan 2023-02-27 5390 unsigned long address)
50ee3253720614 Suren Baghdasaryan 2023-02-27 5391 {
50ee3253720614 Suren Baghdasaryan 2023-02-27 5392 MA_STATE(mas, &mm->mm_mt, address, address);
50ee3253720614 Suren Baghdasaryan 2023-02-27 5393 struct vm_area_struct *vma;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5394
50ee3253720614 Suren Baghdasaryan 2023-02-27 5395 rcu_read_lock();
50ee3253720614 Suren Baghdasaryan 2023-02-27 5396 retry:
50ee3253720614 Suren Baghdasaryan 2023-02-27 5397 vma = mas_walk(&mas);
50ee3253720614 Suren Baghdasaryan 2023-02-27 5398 if (!vma)
50ee3253720614 Suren Baghdasaryan 2023-02-27 5399 goto inval;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5400
50ee3253720614 Suren Baghdasaryan 2023-02-27 5401 if (!vma_start_read(vma))
50ee3253720614 Suren Baghdasaryan 2023-02-27 5402 goto inval;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5403
657b5146955eba Jann Horn 2023-07-26 5404 /*
657b5146955eba Jann Horn 2023-07-26 5405 * find_mergeable_anon_vma uses adjacent vmas which are not locked.
657b5146955eba Jann Horn 2023-07-26 5406 * This check must happen after vma_start_read(); otherwise, a
657b5146955eba Jann Horn 2023-07-26 5407 * concurrent mremap() with MREMAP_DONTUNMAP could dissociate the VMA
657b5146955eba Jann Horn 2023-07-26 5408 * from its anon_vma.
657b5146955eba Jann Horn 2023-07-26 5409 */
657b5146955eba Jann Horn 2023-07-26 @5410 if (unlikely(!vma->anon_vma && !vma_is_tcp(vma)))
657b5146955eba Jann Horn 2023-07-26 5411 goto inval_end_read;
657b5146955eba Jann Horn 2023-07-26 5412
444eeb17437a0e Suren Baghdasaryan 2023-02-27 5413 /*
444eeb17437a0e Suren Baghdasaryan 2023-02-27 5414 * Due to the possibility of userfault handler dropping mmap_lock, avoid
444eeb17437a0e Suren Baghdasaryan 2023-02-27 5415 * it for now and fall back to page fault handling under mmap_lock.
444eeb17437a0e Suren Baghdasaryan 2023-02-27 5416 */
657b5146955eba Jann Horn 2023-07-26 5417 if (userfaultfd_armed(vma))
657b5146955eba Jann Horn 2023-07-26 5418 goto inval_end_read;
444eeb17437a0e Suren Baghdasaryan 2023-02-27 5419
50ee3253720614 Suren Baghdasaryan 2023-02-27 5420 /* Check since vm_start/vm_end might change before we lock the VMA */
657b5146955eba Jann Horn 2023-07-26 5421 if (unlikely(address < vma->vm_start || address >= vma->vm_end))
657b5146955eba Jann Horn 2023-07-26 5422 goto inval_end_read;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5423
50ee3253720614 Suren Baghdasaryan 2023-02-27 5424 /* Check if the VMA got isolated after we found it */
50ee3253720614 Suren Baghdasaryan 2023-02-27 5425 if (vma->detached) {
50ee3253720614 Suren Baghdasaryan 2023-02-27 5426 vma_end_read(vma);
52f238653e452e Suren Baghdasaryan 2023-02-27 5427 count_vm_vma_lock_event(VMA_LOCK_MISS);
50ee3253720614 Suren Baghdasaryan 2023-02-27 5428 /* The area was replaced with another one */
50ee3253720614 Suren Baghdasaryan 2023-02-27 5429 goto retry;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5430 }
50ee3253720614 Suren Baghdasaryan 2023-02-27 5431
50ee3253720614 Suren Baghdasaryan 2023-02-27 5432 rcu_read_unlock();
50ee3253720614 Suren Baghdasaryan 2023-02-27 5433 return vma;
657b5146955eba Jann Horn 2023-07-26 5434
657b5146955eba Jann Horn 2023-07-26 5435 inval_end_read:
657b5146955eba Jann Horn 2023-07-26 5436 vma_end_read(vma);
50ee3253720614 Suren Baghdasaryan 2023-02-27 5437 inval:
50ee3253720614 Suren Baghdasaryan 2023-02-27 5438 rcu_read_unlock();
52f238653e452e Suren Baghdasaryan 2023-02-27 5439 count_vm_vma_lock_event(VMA_LOCK_ABORT);
50ee3253720614 Suren Baghdasaryan 2023-02-27 5440 return NULL;
50ee3253720614 Suren Baghdasaryan 2023-02-27 5441 }
50ee3253720614 Suren Baghdasaryan 2023-02-27 5442 #endif /* CONFIG_PER_VMA_LOCK */
50ee3253720614 Suren Baghdasaryan 2023-02-27 5443

:::::: The code at line 5410 was first introduced by commit
:::::: 657b5146955eba331e01b9a6ae89ce2e716ba306 mm: lock_vma_under_rcu() must check vma->anon_vma under vma lock

:::::: TO: Jann Horn <jannh@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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