diff options
| author | Matthew Wilcox <willy@linux.intel.com> | 2015-09-08 14:58:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 15:35:28 -0700 |
| commit | 5cad465d7fa646bad3d677df276bfc8e2ad709e3 (patch) | |
| tree | 5135ec9240b78a722a2f665f56db9bdefb556bc4 | |
| parent | fc43704437ebe40f642ac53f7ee73661fe74e6b8 (diff) | |
| download | linux-5cad465d7fa646bad3d677df276bfc8e2ad709e3.tar.bz2 | |
mm: add vmf_insert_pfn_pmd()
Similar to vm_insert_pfn(), but for PMDs rather than PTEs. The 'vmf_'
prefix instead of 'vm_' prefix is intended to indicate that it returns a
VMF_ value rather than an errno (which would only have to be converted
into a VMF_ value anyway).
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/huge_mm.h | 2 | ||||
| -rw-r--r-- | mm/huge_memory.c | 43 |
2 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 70587ea079c3..f9b612fec4dd 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -33,6 +33,8 @@ extern int move_huge_pmd(struct vm_area_struct *vma, extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, pgprot_t newprot, int prot_numa); +int vmf_insert_pfn_pmd(struct vm_area_struct *, unsigned long addr, pmd_t *, + unsigned long pfn, bool write); enum transparent_hugepage_flag { TRANSPARENT_HUGEPAGE_FLAG, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index c426a89e025c..3ea6f908a5e0 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -869,6 +869,49 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, flags); } +static int insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, + pmd_t *pmd, unsigned long pfn, pgprot_t prot, bool write) +{ + struct mm_struct *mm = vma->vm_mm; + pmd_t entry; + spinlock_t *ptl; + + ptl = pmd_lock(mm, pmd); + if (pmd_none(*pmd)) { + entry = pmd_mkhuge(pfn_pmd(pfn, prot)); + if (write) { + entry = pmd_mkyoung(pmd_mkdirty(entry)); + entry = maybe_pmd_mkwrite(entry, vma); + } + set_pmd_at(mm, addr, pmd, entry); + update_mmu_cache_pmd(vma, addr, pmd); + } + spin_unlock(ptl); + return VM_FAULT_NOPAGE; +} + +int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, + pmd_t *pmd, unsigned long pfn, bool write) +{ + pgprot_t pgprot = vma->vm_page_prot; + /* + * If we had pmd_special, we could avoid all these restrictions, + * but we need to be consistent with PTEs and architectures that + * can't support a 'special' bit. + */ + BUG_ON(!(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))); + BUG_ON((vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP)) == + (VM_PFNMAP|VM_MIXEDMAP)); + BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); + BUG_ON((vma->vm_flags & VM_MIXEDMAP) && pfn_valid(pfn)); + + if (addr < vma->vm_start || addr >= vma->vm_end) + return VM_FAULT_SIGBUS; + if (track_pfn_insert(vma, &pgprot, pfn)) + return VM_FAULT_SIGBUS; + return insert_pfn_pmd(vma, addr, pmd, pfn, pgprot, write); +} + int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, struct vm_area_struct *vma) |