diff options
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/mm/memory.c b/mm/memory.c index cfce5f1..ece0496 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -334,7 +334,7 @@ static inline void add_mm_rss(struct mm_struct *mm, int file_rss, int anon_rss) /* * This function is called to print an error when a pte in a - * !VM_RESERVED region is found pointing to an invalid pfn (which + * !VM_UNPAGED region is found pointing to an invalid pfn (which * is an error. * * The calling function must still handle the error. @@ -381,15 +381,15 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, goto out_set_pte; } - /* If the region is VM_RESERVED, the mapping is not + /* If the region is VM_UNPAGED, the mapping is not * mapped via rmap - duplicate the pte as is. */ - if (vm_flags & VM_RESERVED) + if (vm_flags & VM_UNPAGED) goto out_set_pte; pfn = pte_pfn(pte); /* If the pte points outside of valid memory but - * the region is not VM_RESERVED, we have a problem. + * the region is not VM_UNPAGED, we have a problem. */ if (unlikely(!pfn_valid(pfn))) { print_bad_pte(vma, pte, addr); @@ -528,7 +528,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, * readonly mappings. The tradeoff is that copy_page_range is more * efficient than faulting. */ - if (!(vma->vm_flags & (VM_HUGETLB|VM_NONLINEAR|VM_RESERVED))) { + if (!(vma->vm_flags & (VM_HUGETLB|VM_NONLINEAR|VM_UNPAGED))) { if (!vma->anon_vma) return 0; } @@ -572,7 +572,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, (*zap_work) -= PAGE_SIZE; - if (!(vma->vm_flags & VM_RESERVED)) { + if (!(vma->vm_flags & VM_UNPAGED)) { unsigned long pfn = pte_pfn(ptent); if (unlikely(!pfn_valid(pfn))) print_bad_pte(vma, ptent, addr); @@ -1191,10 +1191,16 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, * rest of the world about it: * VM_IO tells people not to look at these pages * (accesses can have side effects). - * VM_RESERVED tells the core MM not to "manage" these pages - * (e.g. refcount, mapcount, try to swap them out). + * VM_RESERVED is specified all over the place, because + * in 2.4 it kept swapout's vma scan off this vma; but + * in 2.6 the LRU scan won't even find its pages, so this + * flag means no more than count its pages in reserved_vm, + * and omit it from core dump, even when VM_IO turned off. + * VM_UNPAGED tells the core MM not to "manage" these pages + * (e.g. refcount, mapcount, try to swap them out): in + * particular, zap_pte_range does not try to free them. */ - vma->vm_flags |= VM_IO | VM_RESERVED; + vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED; BUG_ON(addr >= end); pfn -= addr >> PAGE_SHIFT; @@ -1276,7 +1282,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, pte_t entry; int ret = VM_FAULT_MINOR; - BUG_ON(vma->vm_flags & VM_RESERVED); + BUG_ON(vma->vm_flags & VM_UNPAGED); if (unlikely(!pfn_valid(pfn))) { /* @@ -1924,7 +1930,7 @@ retry: inc_mm_counter(mm, anon_rss); lru_cache_add_active(new_page); page_add_anon_rmap(new_page, vma, address); - } else if (!(vma->vm_flags & VM_RESERVED)) { + } else if (!(vma->vm_flags & VM_UNPAGED)) { inc_mm_counter(mm, file_rss); page_add_file_rmap(new_page); } @@ -2203,7 +2209,7 @@ static int __init gate_vma_init(void) gate_vma.vm_start = FIXADDR_USER_START; gate_vma.vm_end = FIXADDR_USER_END; gate_vma.vm_page_prot = PAGE_READONLY; - gate_vma.vm_flags = VM_RESERVED; + gate_vma.vm_flags = 0; return 0; } __initcall(gate_vma_init); |