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-rw-r--r--include/linux/mm.h2
-rw-r--r--mm/nobootmem.c3
-rw-r--r--mm/page_alloc.c17
3 files changed, 21 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 99959a34f4f1..d662af2d0d01 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1635,6 +1635,8 @@ extern void free_highmem_page(struct page *page);
extern void adjust_managed_page_count(struct page *page, long count);
extern void mem_init_print_info(const char *str);
+extern void reserve_bootmem_region(unsigned long start, unsigned long end);
+
/* Free the reserved page into the buddy system, so it gets managed. */
static inline void __free_reserved_page(struct page *page)
{
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index 5258386fa1be..4af8f88c2bd1 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -130,6 +130,9 @@ static unsigned long __init free_low_memory_core_early(void)
memblock_clear_hotplug(0, -1);
+ for_each_reserved_mem_region(i, &start, &end)
+ reserve_bootmem_region(start, end);
+
for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
NULL)
count += __free_memory_core(start, end);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index bc5da2cdfc84..39c8d56a4056 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -774,7 +774,6 @@ static void __meminit __init_single_page(struct page *page, unsigned long pfn,
init_page_count(page);
page_mapcount_reset(page);
page_cpupid_reset_last(page);
- SetPageReserved(page);
/*
* Mark the block movable so that blocks are reserved for
@@ -809,6 +808,22 @@ static void __meminit __init_single_pfn(unsigned long pfn, unsigned long zone,
return __init_single_page(pfn_to_page(pfn), pfn, zone, nid);
}
+/*
+ * Initialised pages do not have PageReserved set. This function is
+ * called for each range allocated by the bootmem allocator and
+ * marks the pages PageReserved. The remaining valid pages are later
+ * sent to the buddy page allocator.
+ */
+void reserve_bootmem_region(unsigned long start, unsigned long end)
+{
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long end_pfn = PFN_UP(end);
+
+ for (; start_pfn < end_pfn; start_pfn++)
+ if (pfn_valid(start_pfn))
+ SetPageReserved(pfn_to_page(start_pfn));
+}
+
static bool free_pages_prepare(struct page *page, unsigned int order)
{
bool compound = PageCompound(page);