mm: make defensive checks around PFN values registered for memory usage

There are a number of different views to how much memory is currently active.
There is the arch-independent zone-sizing view, the bootmem allocator and
memory models view.

Architectures register this information at different times and is not
necessarily in sync particularly with respect to some SPARSEMEM limitations.

This patch introduces mminit_validate_memmodel_limits() which is able to
validate and correct PFN ranges with respect to the memory model.  It is only
SPARSEMEM that currently validates itself.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;