diff options
| -rw-r--r-- | mm/internal.h | 1 | ||||
| -rw-r--r-- | mm/memory.c | 20 | ||||
| -rw-r--r-- | mm/page_alloc.c | 4 |
3 files changed, 15 insertions, 10 deletions
diff --git a/mm/internal.h b/mm/internal.h index 13333bc2eb68..1981bc9454f3 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -49,6 +49,7 @@ extern void putback_lru_page(struct page *page); /* * in mm/page_alloc.c */ +extern unsigned long highest_memmap_pfn; extern void __free_pages_bootmem(struct page *page, unsigned int order); /* diff --git a/mm/memory.c b/mm/memory.c index cda04b19f733..890095f5f36d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -467,21 +467,18 @@ static inline int is_cow_mapping(unsigned int flags) struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, pte_t pte) { - unsigned long pfn; + unsigned long pfn = pte_pfn(pte); if (HAVE_PTE_SPECIAL) { - if (likely(!pte_special(pte))) { - VM_BUG_ON(!pfn_valid(pte_pfn(pte))); - return pte_page(pte); - } - VM_BUG_ON(!(vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))); + if (likely(!pte_special(pte))) + goto check_pfn; + if (!(vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))) + print_bad_pte(vma, addr, pte, NULL); return NULL; } /* !HAVE_PTE_SPECIAL case follows: */ - pfn = pte_pfn(pte); - if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) { if (vma->vm_flags & VM_MIXEDMAP) { if (!pfn_valid(pfn)) @@ -497,11 +494,14 @@ struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, } } - VM_BUG_ON(!pfn_valid(pfn)); +check_pfn: + if (unlikely(pfn > highest_memmap_pfn)) { + print_bad_pte(vma, addr, pte, NULL); + return NULL; + } /* * NOTE! We still have PageReserved() pages in the page tables. - * * eg. VDSO mappings can cause them to exist. */ out: diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 3acb216e9a78..755c99a0ac71 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -69,6 +69,7 @@ EXPORT_SYMBOL(node_states); unsigned long totalram_pages __read_mostly; unsigned long totalreserve_pages __read_mostly; +unsigned long highest_memmap_pfn __read_mostly; int percpu_pagelist_fraction; #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE @@ -2597,6 +2598,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, unsigned long pfn; struct zone *z; + if (highest_memmap_pfn < end_pfn - 1) + highest_memmap_pfn = end_pfn - 1; + z = &NODE_DATA(nid)->node_zones[zone]; for (pfn = start_pfn; pfn < end_pfn; pfn++) { /* |