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-rw-r--r--mm/memory.c30
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);