Re: [PATCH 1/7] Revert "mm: take i_mmap_lock in unmap_mapping_range() for DAX"
Hi Dave,
[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
> fs/dax.c:626:50: sparse: incorrect type in argument 1 (different
address spaces)
fs/dax.c:626:50: expected void *page
fs/dax.c:626:50: got void [noderef] <asn:5>*
vim +626 fs/dax.c
610 result = VM_FAULT_NOPAGE;
611 spin_unlock(ptl);
612 } else {
613 sector = bh.b_blocknr << (blkbits - 9);
614 length = bdev_direct_access(bh.b_bdev, sector, &kaddr, &pfn,
615 bh.b_size);
616 if (length < 0) {
617 result = VM_FAULT_SIGBUS;
618 goto out;
619 }
620 if ((length < PMD_SIZE) || (pfn & PG_PMD_COLOUR))
621 goto fallback;
622
623 if (buffer_unwritten(&bh) || buffer_new(&bh)) {
624 int i;
625 for (i = 0; i < PTRS_PER_PMD; i++)
626 clear_page(kaddr + i * PAGE_SIZE);
627 count_vm_event(PGMAJFAULT);
628 mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
629 result |= VM_FAULT_MAJOR;
630 }
631
632 result |= vmf_insert_pfn_pmd(vma, address, pmd, pfn, write);
633 }
634
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