sparsemem: record when a section has a valid mem_map

We have flags to indicate whether a section actually has a valid mem_map
associated with it.  This is never set and we rely solely on the present bit
to indicate a section is valid.  By definition a section is not valid if it
has no mem_map and there is a window during init where the present bit is set
but there is no mem_map, during which pfn_valid() will return true
incorrectly.

Use the existing SECTION_HAS_MEM_MAP flag to indicate the presence of a valid
mem_map.  Switch valid_section{,_nr} and pfn_valid() to this bit.  Add a new
present_section{,_nr} and pfn_present() interfaces for those users who care to
know that a section is going to be valid.

[akpm@linux-foundation.org: coding-syle fixes]
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 22 insertions, 9 deletions

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 7a1390cd6aad..c41d0728efe2 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -238,7 +238,7 @@ store_mem_state(struct sys_device *dev, const char *buf, size_t count)
         mem = container_of(dev, struct memory_block, sysdev);
         phys_section_nr = mem->phys_index;
 
-        if (!valid_section_nr(phys_section_nr))
+        if (!present_section_nr(phys_section_nr))
                 goto out;
 
         if (!strncmp(buf, "online", min((int)count, 6)))
@@ -418,7 +418,7 @@ int register_new_memory(struct mem_section *section)
 
 int unregister_memory_section(struct mem_section *section)
 {
-        if (!valid_section(section))
+        if (!present_section(section))
                 return -EINVAL;
 
         return remove_memory_block(0, section, 0);
@@ -443,7 +443,7 @@ int __init memory_dev_init(void)
          * during boot and have been initialized
          */
         for (i = 0; i < NR_MEM_SECTIONS; i++) {
-                if (!valid_section_nr(i))
+                if (!present_section_nr(i))
                         continue;
                 err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
                 if (!ret)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 4e5627379b09..f21e5951038b 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -771,12 +771,17 @@ static inline struct page *__section_mem_map_addr(struct mem_section *section)
         return (struct page *)map;
 }
 
-static inline int valid_section(struct mem_section *section)
+static inline int present_section(struct mem_section *section)
 {
         return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
 }
 
-static inline int section_has_mem_map(struct mem_section *section)
+static inline int present_section_nr(unsigned long nr)
+{
+        return present_section(__nr_to_section(nr));
+}
+
+static inline int valid_section(struct mem_section *section)
 {
         return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
 }
@@ -798,6 +803,13 @@ static inline int pfn_valid(unsigned long pfn)
         return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
 }
 
+static inline int pfn_present(unsigned long pfn)
+{
+        if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+                return 0;
+        return present_section(__nr_to_section(pfn_to_section_nr(pfn)));
+}
+
 /*
  * These are _only_ used during initialisation, therefore they
  * can use __initdata ...  They could have names to indicate
diff --git a/mm/sparse.c b/mm/sparse.c
index e8f36e4796d0..54f3940406cb 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -176,7 +176,7 @@ unsigned long __init node_memmap_size_bytes(int nid, unsigned long start_pfn,
                 if (nid != early_pfn_to_nid(pfn))
                         continue;
 
-                if (pfn_valid(pfn))
+                if (pfn_present(pfn))
                         nr_pages += PAGES_PER_SECTION;
         }
 
@@ -206,11 +206,12 @@ struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pn
 static int __meminit sparse_init_one_section(struct mem_section *ms,
                 unsigned long pnum, struct page *mem_map)
 {
-        if (!valid_section(ms))
+        if (!present_section(ms))
                 return -EINVAL;
 
         ms->section_mem_map &= ~SECTION_MAP_MASK;
-        ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum);
+        ms->section_mem_map |= sparse_encode_mem_map(mem_map, pnum) |
+                                                        SECTION_HAS_MEM_MAP;
 
         return 1;
 }
@@ -256,7 +257,7 @@ void __init sparse_init(void)
         struct page *map;
 
         for (pnum = 0; pnum < NR_MEM_SECTIONS; pnum++) {
-                if (!valid_section_nr(pnum))
+                if (!present_section_nr(pnum))
                         continue;
 
                 map = sparse_early_mem_map_alloc(pnum);