[bugfix] mm: zone_end_pfn is too small

[Russ Anderson]

Booting with 32 TBytes memory hits BUG at mm/page_alloc.c:552! (output below).

The key hint is "page 4294967296 outside zone".
4294967296 = 0x100000000 (bit 32 is set).

The problem is in include/linux/mmzone.h:

530 static inline unsigned zone_end_pfn(const struct zone *zone)
531 {
532         return zone->zone_start_pfn + zone->spanned_pages;
533 }

zone_end_pfn is "unsigned" (32 bits).  Changing it to 
"unsigned long" (64 bits) fixes the problem.

zone_end_pfn() was added recently in commit 108bcc96ef7047c02cad4d229f04da38186a3f3f.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/include/linux/mmzone.h?id=108bcc96ef7047c02cad4d229f04da38186a3f3f


Output from the failure.

  No AGP bridge found
  page 4294967296 outside zone [ 4294967296 - 4327469056 ]
  ------------[ cut here ]------------
  kernel BUG at mm/page_alloc.c:552!
  invalid opcode: 0000 [#1] SMP 
  Modules linked in:
  CPU 0 
  Pid: 0, comm: swapper Not tainted 3.9.0-rc2.dtp+ #10  
  RIP: 0010:[<ffffffff811477d2>]  [<ffffffff811477d2>] free_one_page+0x382/0x430
  RSP: 0000:ffffffff81943d98  EFLAGS: 00010002
  RAX: 0000000000000001 RBX: ffffea4000000000 RCX: 000000000000b3d9
  RDX: 0000000000000000 RSI: 0000000000000086 RDI: 0000000000000046
  RBP: ffffffff81943df8 R08: 0000000000000040 R09: 0000000000000023
  R10: 00000000000034bf R11: 00000000000034bf R12: ffffea4000000000
  R13: ffff981efefd9d80 R14: 0000000000000006 R15: 0000000000000006
  FS:  0000000000000000(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffffc7defefff000 CR3: 000000000194e000 CR4: 00000000000406b0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Process swapper (pid: 0, threadinfo ffffffff81942000, task ffffffff81955420)
  Stack:
   00000000000000ff ffffc900000100a0 ffffc900000100d0 ffffffff00000040
   0000000000000000 0000000081148809 0000000000000097 ffffea4000000000
   0000000000000006 0000000000000002 0000000101e82bc0 ffffea4000001000
  Call Trace:
   [<ffffffff81149176>] __free_pages_ok+0x96/0xb0
   [<ffffffff8114c585>] __free_pages+0x25/0x50
   [<ffffffff8164c006>] __free_pages_bootmem+0x8a/0x8c
   [<ffffffff81a9684f>] __free_memory_core+0xea/0x131
   [<ffffffff81a968e0>] free_low_memory_core_early+0x4a/0x98
   [<ffffffff81a96973>] free_all_bootmem+0x45/0x47
   [<ffffffff81a87cff>] mem_init+0x7b/0x14c
   [<ffffffff81a70051>] start_kernel+0x216/0x433
   [<ffffffff81a6fc59>] ? repair_env_string+0x5b/0x5b
   [<ffffffff81a6f5f7>] x86_64_start_reservations+0x2a/0x2c
   [<ffffffff81a6f73d>] x86_64_start_kernel+0x144/0x153
  Code: 89 f1 ba 01 00 00 00 31 f6 d3 e2 4c 89 ef e8 66 a4 01 00 e9 2c fe ff ff 0f 0b eb fe 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 eb f3 <0f> 0b eb fe 0f 0b 0f 1f 84 00 00 00 00 00 eb f6 0f 0b eb fe 49 
  RIP  [<ffffffff811477d2>] free_one_page+0x382/0x430
   RSP <ffffffff81943d98>
  ---[ end trace a7919e7f17c0a725 ]---
  Kernel panic - not syncing: Attempted to kill the idle task!

Signed-off-by: Russ Anderson <rja@xxxxxxx>
Reported-by: George Beshers <gbeshers@xxxxxxx>
Acked-by: Hedi Berriche <hedi@xxxxxxx>

---
 include/linux/mmzone.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/include/linux/mmzone.h
===================================================================
--- linux.orig/include/linux/mmzone.h	2013-03-18 10:06:59.744082190 -0500
+++ linux/include/linux/mmzone.h	2013-03-18 10:23:27.374031648 -0500
@@ -527,7 +527,7 @@ static inline int zone_is_oom_locked(con
 	return test_bit(ZONE_OOM_LOCKED, &zone->flags);
 }
 
-static inline unsigned zone_end_pfn(const struct zone *zone)
+static inline unsigned long zone_end_pfn(const struct zone *zone)
 {
 	return zone->zone_start_pfn + zone->spanned_pages;
 }
-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@xxxxxxx
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