X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=mm%2Fmemremap.c;h=7aa7d6e80ee508b6f9b2fc1a577271dba2acb6ef;hb=9288e1f7d396b7702649d78f2c711c3e0020c71d;hp=16b2fb482da11245092e732c858264ada92d2364;hpb=415e915fdfc775ad0c6675fde1008f6f43dd6251;p=linux-2.6-microblaze.git

diff --git a/mm/memremap.c b/mm/memremap.c
index 16b2fb482da1..7aa7d6e80ee5 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -80,6 +80,21 @@ static unsigned long pfn_first(struct dev_pagemap *pgmap, int range_id)
 	return pfn + vmem_altmap_offset(pgmap_altmap(pgmap));
 }
 
+bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn)
+{
+	int i;
+
+	for (i = 0; i < pgmap->nr_range; i++) {
+		struct range *range = &pgmap->ranges[i];
+
+		if (pfn >= PHYS_PFN(range->start) &&
+		    pfn <= PHYS_PFN(range->end))
+			return pfn >= pfn_first(pgmap, i);
+	}
+
+	return false;
+}
+
 static unsigned long pfn_end(struct dev_pagemap *pgmap, int range_id)
 {
 	const struct range *range = &pgmap->ranges[range_id];
@@ -185,6 +200,7 @@ static void dev_pagemap_percpu_release(struct percpu_ref *ref)
 static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
 		int range_id, int nid)
 {
+	const bool is_private = pgmap->type == MEMORY_DEVICE_PRIVATE;
 	struct range *range = &pgmap->ranges[range_id];
 	struct dev_pagemap *conflict_pgmap;
 	int error, is_ram;
@@ -230,6 +246,11 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
 	if (error)
 		goto err_pfn_remap;
 
+	if (!mhp_range_allowed(range->start, range_len(range), !is_private)) {
+		error = -EINVAL;
+		goto err_pfn_remap;
+	}
+
 	mem_hotplug_begin();
 
 	/*
@@ -243,7 +264,7 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
 	 * the CPU, we do want the linear mapping and thus use
 	 * arch_add_memory().
 	 */
-	if (pgmap->type == MEMORY_DEVICE_PRIVATE) {
+	if (is_private) {
 		error = add_pages(nid, PHYS_PFN(range->start),
 				PHYS_PFN(range_len(range)), params);
 	} else {