[PATCHv3] mm: Don't offset memmap for flatmem

[lauraa@codeaurora.org (Laura Abbott)]

Srinivas Kandagatla reported bad page messages when trying to
remove the bottom 2MB on an ARM based IFC6410 board

BUG: Bad page state in process swapper  pfn:fffa8
page:ef7fb500 count:0 mapcount:0 mapping:  (null) index:0x0
flags: 0x96640253(locked|error|dirty|active|arch_1|reclaim|mlocked)
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
bad because of flags:
flags: 0x200041(locked|active|mlocked)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 3.19.0-rc3-00007-g412f9ba-dirty #816
Hardware name: Qualcomm (Flattened Device Tree)
[<c0218280>] (unwind_backtrace) from [<c0212be8>] (show_stack+0x20/0x24)
[<c0212be8>] (show_stack) from [<c0af7124>] (dump_stack+0x80/0x9c)
[<c0af7124>] (dump_stack) from [<c0301570>] (bad_page+0xc8/0x128)
[<c0301570>] (bad_page) from [<c03018a8>] (free_pages_prepare+0x168/0x1e0)
[<c03018a8>] (free_pages_prepare) from [<c030369c>] (free_hot_cold_page+0x3c/0x174)
[<c030369c>] (free_hot_cold_page) from [<c0303828>] (__free_pages+0x54/0x58)
[<c0303828>] (__free_pages) from [<c030395c>] (free_highmem_page+0x38/0x88)
[<c030395c>] (free_highmem_page) from [<c0f62d5c>] (mem_init+0x240/0x430)
[<c0f62d5c>] (mem_init) from [<c0f5db3c>] (start_kernel+0x1e4/0x3c8)
[<c0f5db3c>] (start_kernel) from [<80208074>] (0x80208074)
Disabling lock debugging due to kernel taint

Removing the lower 2MB made the start of the lowmem zone to no longer
be page block aligned. IFC6410 uses CONFIG_FLATMEM where
alloc_node_mem_map allocates memory for the mem_map. alloc_node_mem_map
will offset for unaligned nodes with the assumption the pfn/page
translation functions will account for the offset. The functions for
CONFIG_FLATMEM do not offset however, resulting in overrunning
the memmap array. Just use the allocated memmap without any offset
when running with CONFIG_FLATMEM to avoid the overrun.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
The thread got too deep so I split this out into a new thread.
See http://marc.info/?l=linux-mm&m=142188852025672&w=2 for previous
thread discussion, last comment by Vlastimil
http://marc.info/?l=linux-mm&m=142505070430844&w=2
---
 mm/page_alloc.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a47f0b2..a308ec7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4945,6 +4945,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
 
 static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 {
+	unsigned long __maybe_unused offset = 0;
+
 	/* Skip empty nodes */
 	if (!pgdat->node_spanned_pages)
 		return;
@@ -4961,6 +4963,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 		 * for the buddy allocator to function correctly.
 		 */
 		start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1);
+		offset = pgdat->node_start_pfn - start;
 		end = pgdat_end_pfn(pgdat);
 		end = ALIGN(end, MAX_ORDER_NR_PAGES);
 		size =  (end - start) * sizeof(struct page);
@@ -4968,7 +4971,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 		if (!map)
 			map = memblock_virt_alloc_node_nopanic(size,
 							       pgdat->node_id);
-		pgdat->node_mem_map = map + (pgdat->node_start_pfn - start);
+		pgdat->node_mem_map = map + offset;
 	}
 #ifndef CONFIG_NEED_MULTIPLE_NODES
 	/*
@@ -4976,10 +4979,12 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 	 */
 	if (pgdat == NODE_DATA(0)) {
 		mem_map = NODE_DATA(0)->node_mem_map;
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-		if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
-			mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+#if defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) || defined(CONFIG_FLATMEM)
+		if (page_to_pfn(mem_map) != pgdat->node_start_pfn) {
+			mem_map -= offset;
+			VM_BUG_ON(page_to_pfn(mem_map) != pgdat->node_start_pfn);
+		}
+#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP || CONFIG_FLATMEM */
 	}
 #endif
 #endif /* CONFIG_FLAT_NODE_MEM_MAP */
-- 
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