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| author | Ingo Molnar <mingo@kernel.org> | 2016-02-18 09:28:03 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-18 09:28:03 +0100 |
| commit | 3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5 (patch) | |
| tree | 294c2f340b11584e58cea90adfc4182ac8742348 /mm/memory.c | |
| parent | 4e79e182b419172e35936a47f098509092d69817 (diff) | |
| parent | f4eafd8bcd5229e998aa252627703b8462c3b90f (diff) | |
| download | lwn-3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5.tar.gz lwn-3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5.zip | |
Merge branch 'x86/urgent' into x86/asm, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/mm/memory.c b/mm/memory.c index 5aa4f55eb786..38090ca37a08 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1612,10 +1612,15 @@ int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, * than insert_pfn). If a zero_pfn were inserted into a VM_MIXEDMAP * without pte special, it would there be refcounted as a normal page. */ - if (!HAVE_PTE_SPECIAL && pfn_t_valid(pfn)) { + if (!HAVE_PTE_SPECIAL && !pfn_t_devmap(pfn) && pfn_t_valid(pfn)) { struct page *page; - page = pfn_t_to_page(pfn); + /* + * At this point we are committed to insert_page() + * regardless of whether the caller specified flags that + * result in pfn_t_has_page() == false. + */ + page = pfn_to_page(pfn_t_to_pfn(pfn)); return insert_page(vma, addr, page, vma->vm_page_prot); } return insert_pfn(vma, addr, pfn, vma->vm_page_prot); @@ -2253,11 +2258,6 @@ static int wp_page_shared(struct mm_struct *mm, struct vm_area_struct *vma, page_cache_get(old_page); - /* - * Only catch write-faults on shared writable pages, - * read-only shared pages can get COWed by - * get_user_pages(.write=1, .force=1). - */ if (vma->vm_ops && vma->vm_ops->page_mkwrite) { int tmp; |