X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Fmempolicy.c;h=bec88c81244e0d4f9541f4098f5f8c8409ba455b;hb=b71d4da092801634d04190693a38ca03bdbe2505;hp=37af443eb0944e5e81b4094bf5b7312540ce170d;hpb=77501f3cb648e18733509a951ed31eddd7ef2c0b;p=powerpc.git

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 37af443eb0..bec88c8124 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2,6 +2,7 @@
  * Simple NUMA memory policy for the Linux kernel.
  *
  * Copyright 2003,2004 Andi Kleen, SuSE Labs.
+ * (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc.
  * Subject to the GNU Public License, version 2.
  *
  * NUMA policy allows the user to give hints in which node(s) memory should
@@ -17,13 +18,19 @@
  *                offset into the backing object or offset into the mapping
  *                for anonymous memory. For process policy an process counter
  *                is used.
+ *
  * bind           Only allocate memory on a specific set of nodes,
  *                no fallback.
+ *                FIXME: memory is allocated starting with the first node
+ *                to the last. It would be better if bind would truly restrict
+ *                the allocation to memory nodes instead
+ *
  * preferred       Try a specific node first before normal fallback.
  *                As a special case node -1 here means do the allocation
  *                on the local CPU. This is normally identical to default,
  *                but useful to set in a VMA when you have a non default
  *                process policy.
+ *
  * default        Allocate on the local node first, or when on a VMA
  *                use the process policy. This is what Linux always did
  *		  in a NUMA aware kernel and still does by, ahem, default.
@@ -93,23 +100,10 @@ struct mempolicy default_policy = {
 	.policy = MPOL_DEFAULT,
 };
 
-/* Check if all specified nodes are online */
-static int nodes_online(unsigned long *nodes)
-{
-	DECLARE_BITMAP(online2, MAX_NUMNODES);
-
-	bitmap_copy(online2, nodes_addr(node_online_map), MAX_NUMNODES);
-	if (bitmap_empty(online2, MAX_NUMNODES))
-		set_bit(0, online2);
-	if (!bitmap_subset(nodes, online2, MAX_NUMNODES))
-		return -EINVAL;
-	return 0;
-}
-
 /* Do sanity checking on a policy */
-static int mpol_check_policy(int mode, unsigned long *nodes)
+static int mpol_check_policy(int mode, nodemask_t *nodes)
 {
-	int empty = bitmap_empty(nodes, MAX_NUMNODES);
+	int empty = nodes_empty(*nodes);
 
 	switch (mode) {
 	case MPOL_DEFAULT:
@@ -124,71 +118,20 @@ static int mpol_check_policy(int mode, unsigned long *nodes)
 			return -EINVAL;
 		break;
 	}
-	return nodes_online(nodes);
-}
-
-/* Copy a node mask from user space. */
-static int get_nodes(unsigned long *nodes, unsigned long __user *nmask,
-		     unsigned long maxnode, int mode)
-{
-	unsigned long k;
-	unsigned long nlongs;
-	unsigned long endmask;
-
-	--maxnode;
-	bitmap_zero(nodes, MAX_NUMNODES);
-	if (maxnode == 0 || !nmask)
-		return 0;
-
-	nlongs = BITS_TO_LONGS(maxnode);
-	if ((maxnode % BITS_PER_LONG) == 0)
-		endmask = ~0UL;
-	else
-		endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1;
-
-	/* When the user specified more nodes than supported just check
-	   if the non supported part is all zero. */
-	if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
-		if (nlongs > PAGE_SIZE/sizeof(long))
-			return -EINVAL;
-		for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
-			unsigned long t;
-			if (get_user(t,  nmask + k))
-				return -EFAULT;
-			if (k == nlongs - 1) {
-				if (t & endmask)
-					return -EINVAL;
-			} else if (t)
-				return -EINVAL;
-		}
-		nlongs = BITS_TO_LONGS(MAX_NUMNODES);
-		endmask = ~0UL;
-	}
-
-	if (copy_from_user(nodes, nmask, nlongs*sizeof(unsigned long)))
-		return -EFAULT;
-	nodes[nlongs-1] &= endmask;
-	/* Update current mems_allowed */
-	cpuset_update_current_mems_allowed();
-	/* Ignore nodes not set in current->mems_allowed */
-	cpuset_restrict_to_mems_allowed(nodes);
-	return mpol_check_policy(mode, nodes);
+	return nodes_subset(*nodes, node_online_map) ? 0 : -EINVAL;
 }
-
 /* Generate a custom zonelist for the BIND policy. */
-static struct zonelist *bind_zonelist(unsigned long *nodes)
+static struct zonelist *bind_zonelist(nodemask_t *nodes)
 {
 	struct zonelist *zl;
 	int num, max, nd;
 
-	max = 1 + MAX_NR_ZONES * bitmap_weight(nodes, MAX_NUMNODES);
+	max = 1 + MAX_NR_ZONES * nodes_weight(*nodes);
 	zl = kmalloc(sizeof(void *) * max, GFP_KERNEL);
 	if (!zl)
 		return NULL;
 	num = 0;
-	for (nd = find_first_bit(nodes, MAX_NUMNODES);
-	     nd < MAX_NUMNODES;
-	     nd = find_next_bit(nodes, MAX_NUMNODES, 1+nd)) {
+	for_each_node_mask(nd, *nodes) {
 		int k;
 		for (k = MAX_NR_ZONES-1; k >= 0; k--) {
 			struct zone *z = &NODE_DATA(nd)->node_zones[k];
@@ -199,17 +142,16 @@ static struct zonelist *bind_zonelist(unsigned long *nodes)
 				policy_zone = k;
 		}
 	}
-	BUG_ON(num >= max);
 	zl->zones[num] = NULL;
 	return zl;
 }
 
 /* Create a new policy */
-static struct mempolicy *mpol_new(int mode, unsigned long *nodes)
+static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
 {
 	struct mempolicy *policy;
 
-	PDprintk("setting mode %d nodes[0] %lx\n", mode, nodes[0]);
+	PDprintk("setting mode %d nodes[0] %lx\n", mode, nodes_addr(*nodes)[0]);
 	if (mode == MPOL_DEFAULT)
 		return NULL;
 	policy = kmem_cache_alloc(policy_cache, GFP_KERNEL);
@@ -218,10 +160,10 @@ static struct mempolicy *mpol_new(int mode, unsigned long *nodes)
 	atomic_set(&policy->refcnt, 1);
 	switch (mode) {
 	case MPOL_INTERLEAVE:
-		bitmap_copy(policy->v.nodes, nodes, MAX_NUMNODES);
+		policy->v.nodes = *nodes;
 		break;
 	case MPOL_PREFERRED:
-		policy->v.preferred_node = find_first_bit(nodes, MAX_NUMNODES);
+		policy->v.preferred_node = first_node(*nodes);
 		if (policy->v.preferred_node >= MAX_NUMNODES)
 			policy->v.preferred_node = -1;
 		break;
@@ -238,34 +180,33 @@ static struct mempolicy *mpol_new(int mode, unsigned long *nodes)
 }
 
 /* Ensure all existing pages follow the policy. */
-static int check_pte_range(struct mm_struct *mm, pmd_t *pmd,
-		unsigned long addr, unsigned long end, unsigned long *nodes)
+static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+		unsigned long addr, unsigned long end, nodemask_t *nodes)
 {
 	pte_t *orig_pte;
 	pte_t *pte;
+	spinlock_t *ptl;
 
-	spin_lock(&mm->page_table_lock);
-	orig_pte = pte = pte_offset_map(pmd, addr);
+	orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 	do {
-		unsigned long pfn;
+		struct page *page;
 		unsigned int nid;
 
 		if (!pte_present(*pte))
 			continue;
-		pfn = pte_pfn(*pte);
-		if (!pfn_valid(pfn))
+		page = vm_normal_page(vma, addr, *pte);
+		if (!page)
 			continue;
-		nid = pfn_to_nid(pfn);
-		if (!test_bit(nid, nodes))
+		nid = page_to_nid(page);
+		if (!node_isset(nid, *nodes))
 			break;
 	} while (pte++, addr += PAGE_SIZE, addr != end);
-	pte_unmap(orig_pte);
-	spin_unlock(&mm->page_table_lock);
+	pte_unmap_unlock(orig_pte, ptl);
 	return addr != end;
 }
 
-static inline int check_pmd_range(struct mm_struct *mm, pud_t *pud,
-		unsigned long addr, unsigned long end, unsigned long *nodes)
+static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
+		unsigned long addr, unsigned long end, nodemask_t *nodes)
 {
 	pmd_t *pmd;
 	unsigned long next;
@@ -275,14 +216,14 @@ static inline int check_pmd_range(struct mm_struct *mm, pud_t *pud,
 		next = pmd_addr_end(addr, end);
 		if (pmd_none_or_clear_bad(pmd))
 			continue;
-		if (check_pte_range(mm, pmd, addr, next, nodes))
+		if (check_pte_range(vma, pmd, addr, next, nodes))
 			return -EIO;
 	} while (pmd++, addr = next, addr != end);
 	return 0;
 }
 
-static inline int check_pud_range(struct mm_struct *mm, pgd_t *pgd,
-		unsigned long addr, unsigned long end, unsigned long *nodes)
+static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
+		unsigned long addr, unsigned long end, nodemask_t *nodes)
 {
 	pud_t *pud;
 	unsigned long next;
@@ -292,24 +233,24 @@ static inline int check_pud_range(struct mm_struct *mm, pgd_t *pgd,
 		next = pud_addr_end(addr, end);
 		if (pud_none_or_clear_bad(pud))
 			continue;
-		if (check_pmd_range(mm, pud, addr, next, nodes))
+		if (check_pmd_range(vma, pud, addr, next, nodes))
 			return -EIO;
 	} while (pud++, addr = next, addr != end);
 	return 0;
 }
 
-static inline int check_pgd_range(struct mm_struct *mm,
-		unsigned long addr, unsigned long end, unsigned long *nodes)
+static inline int check_pgd_range(struct vm_area_struct *vma,
+		unsigned long addr, unsigned long end, nodemask_t *nodes)
 {
 	pgd_t *pgd;
 	unsigned long next;
 
-	pgd = pgd_offset(mm, addr);
+	pgd = pgd_offset(vma->vm_mm, addr);
 	do {
 		next = pgd_addr_end(addr, end);
 		if (pgd_none_or_clear_bad(pgd))
 			continue;
-		if (check_pud_range(mm, pgd, addr, next, nodes))
+		if (check_pud_range(vma, pgd, addr, next, nodes))
 			return -EIO;
 	} while (pgd++, addr = next, addr != end);
 	return 0;
@@ -318,7 +259,7 @@ static inline int check_pgd_range(struct mm_struct *mm,
 /* Step 1: check the range */
 static struct vm_area_struct *
 check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
-	    unsigned long *nodes, unsigned long flags)
+	    nodemask_t *nodes, unsigned long flags)
 {
 	int err;
 	struct vm_area_struct *first, *vma, *prev;
@@ -338,8 +279,7 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
 				endvma = end;
 			if (vma->vm_start > start)
 				start = vma->vm_start;
-			err = check_pgd_range(vma->vm_mm,
-					   start, endvma, nodes);
+			err = check_pgd_range(vma, start, endvma, nodes);
 			if (err) {
 				first = ERR_PTR(err);
 				break;
@@ -393,17 +333,25 @@ static int mbind_range(struct vm_area_struct *vma, unsigned long start,
 	return err;
 }
 
-/* Change policy for a memory range */
-asmlinkage long sys_mbind(unsigned long start, unsigned long len,
-			  unsigned long mode,
-			  unsigned long __user *nmask, unsigned long maxnode,
-			  unsigned flags)
+static int contextualize_policy(int mode, nodemask_t *nodes)
+{
+	if (!nodes)
+		return 0;
+
+	/* Update current mems_allowed */
+	cpuset_update_current_mems_allowed();
+	/* Ignore nodes not set in current->mems_allowed */
+	cpuset_restrict_to_mems_allowed(nodes->bits);
+	return mpol_check_policy(mode, nodes);
+}
+
+long do_mbind(unsigned long start, unsigned long len,
+		unsigned long mode, nodemask_t *nmask, unsigned long flags)
 {
 	struct vm_area_struct *vma;
 	struct mm_struct *mm = current->mm;
 	struct mempolicy *new;
 	unsigned long end;
-	DECLARE_BITMAP(nodes, MAX_NUMNODES);
 	int err;
 
 	if ((flags & ~(unsigned long)(MPOL_MF_STRICT)) || mode > MPOL_MAX)
@@ -418,20 +366,17 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
 		return -EINVAL;
 	if (end == start)
 		return 0;
-
-	err = get_nodes(nodes, nmask, maxnode, mode);
-	if (err)
-		return err;
-
-	new = mpol_new(mode, nodes);
+	if (mpol_check_policy(mode, nmask))
+		return -EINVAL;
+	new = mpol_new(mode, nmask);
 	if (IS_ERR(new))
 		return PTR_ERR(new);
 
 	PDprintk("mbind %lx-%lx mode:%ld nodes:%lx\n",start,start+len,
-			mode,nodes[0]);
+			mode,nodes_addr(nodes)[0]);
 
 	down_write(&mm->mmap_sem);
-	vma = check_range(mm, start, end, nodes, flags);
+	vma = check_range(mm, start, end, nmask, flags);
 	err = PTR_ERR(vma);
 	if (!IS_ERR(vma))
 		err = mbind_range(vma, start, end, new);
@@ -441,50 +386,45 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
 }
 
 /* Set the process memory policy */
-asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
-				   unsigned long maxnode)
+long do_set_mempolicy(int mode, nodemask_t *nodes)
 {
-	int err;
 	struct mempolicy *new;
-	DECLARE_BITMAP(nodes, MAX_NUMNODES);
 
-	if (mode < 0 || mode > MPOL_MAX)
+	if (contextualize_policy(mode, nodes))
 		return -EINVAL;
-	err = get_nodes(nodes, nmask, maxnode, mode);
-	if (err)
-		return err;
 	new = mpol_new(mode, nodes);
 	if (IS_ERR(new))
 		return PTR_ERR(new);
 	mpol_free(current->mempolicy);
 	current->mempolicy = new;
 	if (new && new->policy == MPOL_INTERLEAVE)
-		current->il_next = find_first_bit(new->v.nodes, MAX_NUMNODES);
+		current->il_next = first_node(new->v.nodes);
 	return 0;
 }
 
 /* Fill a zone bitmap for a policy */
-static void get_zonemask(struct mempolicy *p, unsigned long *nodes)
+static void get_zonemask(struct mempolicy *p, nodemask_t *nodes)
 {
 	int i;
 
-	bitmap_zero(nodes, MAX_NUMNODES);
+	nodes_clear(*nodes);
 	switch (p->policy) {
 	case MPOL_BIND:
 		for (i = 0; p->v.zonelist->zones[i]; i++)
-			__set_bit(p->v.zonelist->zones[i]->zone_pgdat->node_id, nodes);
+			node_set(p->v.zonelist->zones[i]->zone_pgdat->node_id,
+				*nodes);
 		break;
 	case MPOL_DEFAULT:
 		break;
 	case MPOL_INTERLEAVE:
-		bitmap_copy(nodes, p->v.nodes, MAX_NUMNODES);
+		*nodes = p->v.nodes;
 		break;
 	case MPOL_PREFERRED:
 		/* or use current node instead of online map? */
 		if (p->v.preferred_node < 0)
-			bitmap_copy(nodes, nodes_addr(node_online_map), MAX_NUMNODES);
+			*nodes = node_online_map;
 		else
-			__set_bit(p->v.preferred_node, nodes);
+			node_set(p->v.preferred_node, *nodes);
 		break;
 	default:
 		BUG();
@@ -504,37 +444,18 @@ static int lookup_node(struct mm_struct *mm, unsigned long addr)
 	return err;
 }
 
-/* Copy a kernel node mask to user space */
-static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
-			      void *nodes, unsigned nbytes)
-{
-	unsigned long copy = ALIGN(maxnode-1, 64) / 8;
-
-	if (copy > nbytes) {
-		if (copy > PAGE_SIZE)
-			return -EINVAL;
-		if (clear_user((char __user *)mask + nbytes, copy - nbytes))
-			return -EFAULT;
-		copy = nbytes;
-	}
-	return copy_to_user(mask, nodes, copy) ? -EFAULT : 0;
-}
-
 /* Retrieve NUMA policy */
-asmlinkage long sys_get_mempolicy(int __user *policy,
-				  unsigned long __user *nmask,
-				  unsigned long maxnode,
-				  unsigned long addr, unsigned long flags)
+long do_get_mempolicy(int *policy, nodemask_t *nmask,
+			unsigned long addr, unsigned long flags)
 {
-	int err, pval;
+	int err;
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma = NULL;
 	struct mempolicy *pol = current->mempolicy;
 
+	cpuset_update_current_mems_allowed();
 	if (flags & ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR))
 		return -EINVAL;
-	if (nmask != NULL && maxnode < MAX_NUMNODES)
-		return -EINVAL;
 	if (flags & MPOL_F_ADDR) {
 		down_read(&mm->mmap_sem);
 		vma = find_vma_intersection(mm, addr, addr+1);
@@ -557,31 +478,25 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
 			err = lookup_node(mm, addr);
 			if (err < 0)
 				goto out;
-			pval = err;
+			*policy = err;
 		} else if (pol == current->mempolicy &&
 				pol->policy == MPOL_INTERLEAVE) {
-			pval = current->il_next;
+			*policy = current->il_next;
 		} else {
 			err = -EINVAL;
 			goto out;
 		}
 	} else
-		pval = pol->policy;
+		*policy = pol->policy;
 
 	if (vma) {
 		up_read(&current->mm->mmap_sem);
 		vma = NULL;
 	}
 
-	if (policy && put_user(pval, policy))
-		return -EFAULT;
-
 	err = 0;
-	if (nmask) {
-		DECLARE_BITMAP(nodes, MAX_NUMNODES);
-		get_zonemask(pol, nodes);
-		err = copy_nodes_to_user(nmask, maxnode, nodes, sizeof(nodes));
-	}
+	if (nmask)
+		get_zonemask(pol, nmask);
 
  out:
 	if (vma)
@@ -589,6 +504,126 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
 	return err;
 }
 
+/*
+ * User space interface with variable sized bitmaps for nodelists.
+ */
+
+/* Copy a node mask from user space. */
+static int get_nodes(nodemask_t *nodes, unsigned long __user *nmask,
+		     unsigned long maxnode)
+{
+	unsigned long k;
+	unsigned long nlongs;
+	unsigned long endmask;
+
+	--maxnode;
+	nodes_clear(*nodes);
+	if (maxnode == 0 || !nmask)
+		return 0;
+
+	nlongs = BITS_TO_LONGS(maxnode);
+	if ((maxnode % BITS_PER_LONG) == 0)
+		endmask = ~0UL;
+	else
+		endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1;
+
+	/* When the user specified more nodes than supported just check
+	   if the non supported part is all zero. */
+	if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) {
+		if (nlongs > PAGE_SIZE/sizeof(long))
+			return -EINVAL;
+		for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) {
+			unsigned long t;
+			if (get_user(t, nmask + k))
+				return -EFAULT;
+			if (k == nlongs - 1) {
+				if (t & endmask)
+					return -EINVAL;
+			} else if (t)
+				return -EINVAL;
+		}
+		nlongs = BITS_TO_LONGS(MAX_NUMNODES);
+		endmask = ~0UL;
+	}
+
+	if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long)))
+		return -EFAULT;
+	nodes_addr(*nodes)[nlongs-1] &= endmask;
+	return 0;
+}
+
+/* Copy a kernel node mask to user space */
+static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode,
+			      nodemask_t *nodes)
+{
+	unsigned long copy = ALIGN(maxnode-1, 64) / 8;
+	const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long);
+
+	if (copy > nbytes) {
+		if (copy > PAGE_SIZE)
+			return -EINVAL;
+		if (clear_user((char __user *)mask + nbytes, copy - nbytes))
+			return -EFAULT;
+		copy = nbytes;
+	}
+	return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0;
+}
+
+asmlinkage long sys_mbind(unsigned long start, unsigned long len,
+			unsigned long mode,
+			unsigned long __user *nmask, unsigned long maxnode,
+			unsigned flags)
+{
+	nodemask_t nodes;
+	int err;
+
+	err = get_nodes(&nodes, nmask, maxnode);
+	if (err)
+		return err;
+	return do_mbind(start, len, mode, &nodes, flags);
+}
+
+/* Set the process memory policy */
+asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
+		unsigned long maxnode)
+{
+	int err;
+	nodemask_t nodes;
+
+	if (mode < 0 || mode > MPOL_MAX)
+		return -EINVAL;
+	err = get_nodes(&nodes, nmask, maxnode);
+	if (err)
+		return err;
+	return do_set_mempolicy(mode, &nodes);
+}
+
+/* Retrieve NUMA policy */
+asmlinkage long sys_get_mempolicy(int __user *policy,
+				unsigned long __user *nmask,
+				unsigned long maxnode,
+				unsigned long addr, unsigned long flags)
+{
+	int err, pval;
+	nodemask_t nodes;
+
+	if (nmask != NULL && maxnode < MAX_NUMNODES)
+		return -EINVAL;
+
+	err = do_get_mempolicy(&pval, &nodes, addr, flags);
+
+	if (err)
+		return err;
+
+	if (policy && put_user(pval, policy))
+		return -EFAULT;
+
+	if (nmask)
+		err = copy_nodes_to_user(nmask, maxnode, &nodes);
+
+	return err;
+}
+
 #ifdef CONFIG_COMPAT
 
 asmlinkage long compat_sys_get_mempolicy(int __user *policy,
@@ -649,15 +684,15 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
 	long err = 0;
 	unsigned long __user *nm = NULL;
 	unsigned long nr_bits, alloc_size;
-	DECLARE_BITMAP(bm, MAX_NUMNODES);
+	nodemask_t bm;
 
 	nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
 	alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
 
 	if (nmask) {
-		err = compat_get_bitmap(bm, nmask, nr_bits);
+		err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits);
 		nm = compat_alloc_user_space(alloc_size);
-		err |= copy_to_user(nm, bm, alloc_size);
+		err |= copy_to_user(nm, nodes_addr(bm), alloc_size);
 	}
 
 	if (err)
@@ -676,7 +711,7 @@ get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned lo
 
 	if (vma) {
 		if (vma->vm_ops && vma->vm_ops->get_policy)
-		        pol = vma->vm_ops->get_policy(vma, addr);
+			pol = vma->vm_ops->get_policy(vma, addr);
 		else if (vma->vm_policy &&
 				vma->vm_policy->policy != MPOL_DEFAULT)
 			pol = vma->vm_policy;
@@ -700,7 +735,7 @@ static struct zonelist *zonelist_policy(gfp_t gfp, struct mempolicy *policy)
 	case MPOL_BIND:
 		/* Lower zones don't get a policy applied */
 		/* Careful: current->mems_allowed might have moved */
-		if ((gfp & GFP_ZONEMASK) >= policy_zone)
+		if (gfp_zone(gfp) >= policy_zone)
 			if (cpuset_zonelist_valid_mems_allowed(policy->v.zonelist))
 				return policy->v.zonelist;
 		/*FALL THROUGH*/
@@ -712,7 +747,7 @@ static struct zonelist *zonelist_policy(gfp_t gfp, struct mempolicy *policy)
 		nd = 0;
 		BUG();
 	}
-	return NODE_DATA(nd)->node_zonelists + (gfp & GFP_ZONEMASK);
+	return NODE_DATA(nd)->node_zonelists + gfp_zone(gfp);
 }
 
 /* Do dynamic interleaving for a process */
@@ -722,10 +757,9 @@ static unsigned interleave_nodes(struct mempolicy *policy)
 	struct task_struct *me = current;
 
 	nid = me->il_next;
-	BUG_ON(nid >= MAX_NUMNODES);
-	next = find_next_bit(policy->v.nodes, MAX_NUMNODES, 1+nid);
+	next = next_node(nid, policy->v.nodes);
 	if (next >= MAX_NUMNODES)
-		next = find_first_bit(policy->v.nodes, MAX_NUMNODES);
+		next = first_node(policy->v.nodes);
 	me->il_next = next;
 	return nid;
 }
@@ -734,30 +768,28 @@ static unsigned interleave_nodes(struct mempolicy *policy)
 static unsigned offset_il_node(struct mempolicy *pol,
 		struct vm_area_struct *vma, unsigned long off)
 {
-	unsigned nnodes = bitmap_weight(pol->v.nodes, MAX_NUMNODES);
+	unsigned nnodes = nodes_weight(pol->v.nodes);
 	unsigned target = (unsigned)off % nnodes;
 	int c;
 	int nid = -1;
 
 	c = 0;
 	do {
-		nid = find_next_bit(pol->v.nodes, MAX_NUMNODES, nid+1);
+		nid = next_node(nid, pol->v.nodes);
 		c++;
 	} while (c <= target);
-	BUG_ON(nid >= MAX_NUMNODES);
-	BUG_ON(!test_bit(nid, pol->v.nodes));
 	return nid;
 }
 
 /* Allocate a page in interleaved policy.
    Own path because it needs to do special accounting. */
-static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, unsigned nid)
+static struct page *alloc_page_interleave(gfp_t gfp, unsigned order,
+					unsigned nid)
 {
 	struct zonelist *zl;
 	struct page *page;
 
-	BUG_ON(!node_online(nid));
-	zl = NODE_DATA(nid)->node_zonelists + (gfp & GFP_ZONEMASK);
+	zl = NODE_DATA(nid)->node_zonelists + gfp_zone(gfp);
 	page = __alloc_pages(gfp, order, zl);
 	if (page && page_zone(page) == zl->zones[0]) {
 		zone_pcp(zl->zones[0],get_cpu())->interleave_hit++;
@@ -799,8 +831,6 @@ alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr)
 		unsigned nid;
 		if (vma) {
 			unsigned long off;
-			BUG_ON(addr >= vma->vm_end);
-			BUG_ON(addr < vma->vm_start);
 			off = vma->vm_pgoff;
 			off += (addr - vma->vm_start) >> PAGE_SHIFT;
 			nid = offset_il_node(pol, vma, off);
@@ -878,7 +908,7 @@ int __mpol_equal(struct mempolicy *a, struct mempolicy *b)
 	case MPOL_DEFAULT:
 		return 1;
 	case MPOL_INTERLEAVE:
-		return bitmap_equal(a->v.nodes, b->v.nodes, MAX_NUMNODES);
+		return nodes_equal(a->v.nodes, b->v.nodes);
 	case MPOL_PREFERRED:
 		return a->v.preferred_node == b->v.preferred_node;
 	case MPOL_BIND: {
@@ -1117,7 +1147,7 @@ int mpol_set_shared_policy(struct shared_policy *info,
 	PDprintk("set_shared_policy %lx sz %lu %d %lx\n",
 		 vma->vm_pgoff,
 		 sz, npol? npol->policy : -1,
-		npol ? npol->v.nodes[0] : -1);
+		npol ? nodes_addr(npol->v.nodes)[0] : -1);
 
 	if (npol) {
 		new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol);
@@ -1164,14 +1194,75 @@ void __init numa_policy_init(void)
 	/* Set interleaving policy for system init. This way not all
 	   the data structures allocated at system boot end up in node zero. */
 
-	if (sys_set_mempolicy(MPOL_INTERLEAVE, nodes_addr(node_online_map),
-							MAX_NUMNODES) < 0)
+	if (do_set_mempolicy(MPOL_INTERLEAVE, &node_online_map))
 		printk("numa_policy_init: interleaving failed\n");
 }
 
-/* Reset policy of current process to default.
- * Assumes fs == KERNEL_DS */
+/* Reset policy of current process to default */
 void numa_default_policy(void)
 {
-	sys_set_mempolicy(MPOL_DEFAULT, NULL, 0);
+	do_set_mempolicy(MPOL_DEFAULT, NULL);
+}
+
+/* Migrate a policy to a different set of nodes */
+static void rebind_policy(struct mempolicy *pol, const nodemask_t *old,
+							const nodemask_t *new)
+{
+	nodemask_t tmp;
+
+	if (!pol)
+		return;
+
+	switch (pol->policy) {
+	case MPOL_DEFAULT:
+		break;
+	case MPOL_INTERLEAVE:
+		nodes_remap(tmp, pol->v.nodes, *old, *new);
+		pol->v.nodes = tmp;
+		current->il_next = node_remap(current->il_next, *old, *new);
+		break;
+	case MPOL_PREFERRED:
+		pol->v.preferred_node = node_remap(pol->v.preferred_node,
+								*old, *new);
+		break;
+	case MPOL_BIND: {
+		nodemask_t nodes;
+		struct zone **z;
+		struct zonelist *zonelist;
+
+		nodes_clear(nodes);
+		for (z = pol->v.zonelist->zones; *z; z++)
+			node_set((*z)->zone_pgdat->node_id, nodes);
+		nodes_remap(tmp, nodes, *old, *new);
+		nodes = tmp;
+
+		zonelist = bind_zonelist(&nodes);
+
+		/* If no mem, then zonelist is NULL and we keep old zonelist.
+		 * If that old zonelist has no remaining mems_allowed nodes,
+		 * then zonelist_policy() will "FALL THROUGH" to MPOL_DEFAULT.
+		 */
+
+		if (zonelist) {
+			/* Good - got mem - substitute new zonelist */
+			kfree(pol->v.zonelist);
+			pol->v.zonelist = zonelist;
+		}
+		break;
+	}
+	default:
+		BUG();
+		break;
+	}
+}
+
+/*
+ * Someone moved this task to different nodes.  Fixup mempolicies.
+ *
+ * TODO - fixup current->mm->vma and shmfs/tmpfs/hugetlbfs policies as well,
+ * once we have a cpuset mechanism to mark which cpuset subtree is migrating.
+ */
+void numa_policy_rebind(const nodemask_t *old, const nodemask_t *new)
+{
+	rebind_policy(current->mempolicy, old, new);
 }