4 files changed, 44 insertions, 8 deletions

diff --git a/mm/bootmem.c b/mm/bootmem.c
index 8d9f60e06f62..9f4bbc5da73f 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -91,6 +91,7 @@ static unsigned long __init init_bootmem_core(pg_data_t *pgdat,
         bootmem_data_t *bdata = pgdat->bdata;
         unsigned long mapsize;
 
+        mminit_validate_memmodel_limits(&start, &end);
         bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
         bdata->node_boot_start = PFN_PHYS(start);
         bdata->node_low_pfn = end;
diff --git a/mm/internal.h b/mm/internal.h
index 7a4a2885dc8e..5d17f3efac41 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -98,4 +98,16 @@ static inline void mminit_verify_page_links(struct page *page,
 {
 }
 #endif /* CONFIG_DEBUG_MEMORY_INIT */
+
+/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
+#if defined(CONFIG_SPARSEMEM)
+extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
+                                unsigned long *end_pfn);
+#else
+static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
+                                unsigned long *end_pfn)
+{
+}
+#endif /* CONFIG_SPARSEMEM */
+
 #endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index acab6ad326df..0adb66e711e6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3536,6 +3536,8 @@ void __init add_active_range(unsigned int nid, unsigned long start_pfn,
                         nid, start_pfn, end_pfn,
                         nr_nodemap_entries, MAX_ACTIVE_REGIONS);
 
+        mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
+
         /* Merge with existing active regions if possible */
         for (i = 0; i < nr_nodemap_entries; i++) {
                 if (early_node_map[i].nid != nid)
diff --git a/mm/sparse.c b/mm/sparse.c
index 36511c7b5e2c..7a3650923d9a 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -12,6 +12,7 @@
 #include <asm/dma.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
+#include "internal.h"
 
 /*
  * Permanent SPARSEMEM data:
@@ -147,22 +148,41 @@ static inline int sparse_early_nid(struct mem_section *section)
         return (section->section_mem_map >> SECTION_NID_SHIFT);
 }
 
-/* Record a memory area against a node. */
-void __init memory_present(int nid, unsigned long start, unsigned long end)
+/* Validate the physical addressing limitations of the model */
+void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
+                                                unsigned long *end_pfn)
 {
-        unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
-        unsigned long pfn;
+        unsigned long max_sparsemem_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT);
 
         /*
          * Sanity checks - do not allow an architecture to pass
          * in larger pfns than the maximum scope of sparsemem:
          */
-        if (start >= max_arch_pfn)
-                return;
-        if (end >= max_arch_pfn)
-                end = max_arch_pfn;
+        if (*start_pfn > max_sparsemem_pfn) {
+                mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
+                        "Start of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
+                        *start_pfn, *end_pfn, max_sparsemem_pfn);
+                WARN_ON_ONCE(1);
+                *start_pfn = max_sparsemem_pfn;
+                *end_pfn = max_sparsemem_pfn;
+        }
+
+        if (*end_pfn > max_sparsemem_pfn) {
+                mminit_dprintk(MMINIT_WARNING, "pfnvalidation",
+                        "End of range %lu -> %lu exceeds SPARSEMEM max %lu\n",
+                        *start_pfn, *end_pfn, max_sparsemem_pfn);
+                WARN_ON_ONCE(1);
+                *end_pfn = max_sparsemem_pfn;
+        }
+}
+
+/* Record a memory area against a node. */
+void __init memory_present(int nid, unsigned long start, unsigned long end)
+{
+        unsigned long pfn;
 
         start &= PAGE_SECTION_MASK;
+        mminit_validate_memmodel_limits(&start, &end);
         for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
                 unsigned long section = pfn_to_section_nr(pfn);
                 struct mem_section *ms;
@@ -187,6 +207,7 @@ unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
         unsigned long pfn;
         unsigned long nr_pages = 0;
 
+        mminit_validate_memmodel_limits(&start_pfn, &end_pfn);
         for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
                 if (nid != early_pfn_to_nid(pfn))
                         continue;