diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 0d4d8bec0df4b4bc94419954fc2471216b710dbb..b44b36e0c29325281daa939d7eeacf8df8d3eb84 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -285,8 +285,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
* It's fine to use that for setting breakpoints in the vDSO code
* pages though
*/
- vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE |
- VM_MAYEXEC | VM_RESERVED;
+ vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
vma->vm_flags |= mm->def_flags;
vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
vma->vm_ops = &vdso_vmops;
diff --git a/arch/sparc/mm/generic.c b/arch/sparc/mm/generic.c
index 9604893ffdbd020955ec7d0a1e1bbdd6ac942afe..0410bae681f869c6335ab3f8bffd45c14f204920 100644
--- a/arch/sparc/mm/generic.c
+++ b/arch/sparc/mm/generic.c
@@ -74,7 +74,7 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
/* See comment in mm/memory.c remap_pfn_range */
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED;
prot = __pgprot(pg_iobits);
offset -= from;
diff --git a/arch/sparc64/mm/generic.c b/arch/sparc64/mm/generic.c
index 112c316e7cd213e6b59cc1284a49d7fc05aae898..8fd4cb1f050a19e394068abce75e8ff08fbd57e7 100644
--- a/arch/sparc64/mm/generic.c
+++ b/arch/sparc64/mm/generic.c
@@ -128,7 +128,7 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
/* See comment in mm/memory.c remap_pfn_range */
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED;
prot = __pgprot(pg_iobits);
offset -= from;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9701210c66805d76fdb368e3424379c80f9b22c6..f0cdfd18db55b7edfe3af313dbf4cd9bcca22f70 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -144,7 +144,8 @@ extern unsigned int kobjsize(const void *objp);
#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
#define VM_GROWSUP 0x00000200
-#define VM_SHM 0x00000400 /* shared memory area, don't swap out */
+#define VM_SHM 0x00000000 /* Means nothing: delete it later */
+#define VM_UNPAGED 0x00000400 /* Pages managed without map count */
#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
#define VM_EXECUTABLE 0x00001000
@@ -157,7 +158,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
-#define VM_RESERVED 0x00080000 /* Pages managed in a special way */
+#define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
diff --git a/mm/fremap.c b/mm/fremap.c
index d862be3bc3e31f6d1914995b6bc2a6d5fa75e180..94254c5d7a18cf40f64dfe32ec4fdde41a1e9aae 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -65,7 +65,7 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pte_t pte_val;
spinlock_t *ptl;
- BUG_ON(vma->vm_flags & VM_RESERVED);
+ BUG_ON(vma->vm_flags & VM_UNPAGED);
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
@@ -122,7 +122,7 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
pte_t pte_val;
spinlock_t *ptl;
- BUG_ON(vma->vm_flags & VM_RESERVED);
+ BUG_ON(vma->vm_flags & VM_UNPAGED);
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
diff --git a/mm/madvise.c b/mm/madvise.c
index 17aaf3e1644983a5a4fac14bef8f009f71fe866c..328a3bcce5271ee969e231962354159227da9eba 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -126,7 +126,7 @@ static long madvise_dontneed(struct vm_area_struct * vma,
unsigned long start, unsigned long end)
{
*prev = vma;
- if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_RESERVED))
+ if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_UNPAGED))
return -EINVAL;
if (unlikely(vma->vm_flags & VM_NONLINEAR)) {
diff --git a/mm/memory.c b/mm/memory.c
index cfce5f1f30f20b36bc8a41ebc430bfecf7d9608d..ece04963158e4c61cb89c0bd38736d2dc59f76d1 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 @@ static int do_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
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);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 5abc57c2b8bdd3804708267832fd20d29a65be71..5609a31bdf229e51300474764c320d0404767fe5 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -269,7 +269,7 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
first = find_vma(mm, start);
if (!first)
return ERR_PTR(-EFAULT);
- if (first->vm_flags & VM_RESERVED)
+ if (first->vm_flags & VM_UNPAGED)
return ERR_PTR(-EACCES);
prev = NULL;
for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) {
diff --git a/mm/msync.c b/mm/msync.c
index 0e040e9c39d835a7cf938468be6a9b7bccb95c2d..b3f4caf3010b3ae998e456ba99faeff335623e07 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -97,9 +97,9 @@ static void msync_page_range(struct vm_area_struct *vma,
/* For hugepages we can't go walking the page table normally,
* but that's ok, hugetlbfs is memory based, so we don't need
* to do anything more on an msync().
- * Can't do anything with VM_RESERVED regions either.
+ * Can't do anything with VM_UNPAGED regions either.
*/
- if (vma->vm_flags & (VM_HUGETLB|VM_RESERVED))
+ if (vma->vm_flags & (VM_HUGETLB|VM_UNPAGED))
return;
BUG_ON(addr >= end);