x86_64: make bootmap_start page align v6

boot oopses when a system has 64 or 128 GB of RAM installed:

Calling initcall 0xffffffff80bc33b6: sctp_init+0x0/0x711()
BUG: unable to handle kernel NULL pointer dereference at 000000000000005f
IP: [<ffffffff802bfe55>] proc_register+0xe7/0x10f
PGD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.24-smp-g5a514e21-dirty #6
RIP: 0010:[<ffffffff802bfe55>]  [<ffffffff802bfe55>] proc_register+0xe7/0x10f
RSP: 0000:ffff810824c57e60  EFLAGS: 00010246
RAX: 000000000000d7d7 RBX: ffff811024c5fa80 RCX: ffff810824c57e08
RDX: 0000000000000000 RSI: 0000000000000195 RDI: ffffffff80cc2460
RBP: ffffffffffffffff R08: 0000000000000000 R09: ffff811024c5fa80
R10: 0000000000000000 R11: 0000000000000002 R12: ffff810824c57e6c
R13: 0000000000000000 R14: ffff810824c57ee0 R15: 00000006abd25bee
FS:  0000000000000000(0000) GS:ffffffff80b4d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 000000000000005f CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 1, threadinfo ffff810824c56000, task ffff812024c52000)
Stack:  ffffffff80a57348 0000019500000000 ffff811024c5fa80 0000000000000000
 00000000ffffff97 ffffffff802bfef0 0000000000000000 ffffffffffffffff
 0000000000000000 ffffffff80bc3b4b ffff810824c57ee0 ffffffff80bc34a5
Call Trace:
 [<ffffffff802bfef0>] ? create_proc_entry+0x73/0x8a
 [<ffffffff80bc3b4b>] ? sctp_snmp_proc_init+0x1c/0x34
 [<ffffffff80bc34a5>] ? sctp_init+0xef/0x711
 [<ffffffff80b976e3>] ? kernel_init+0x175/0x2e1
 [<ffffffff8020ccf8>] ? child_rip+0xa/0x12
 [<ffffffff80b9756e>] ? kernel_init+0x0/0x2e1
 [<ffffffff8020ccee>] ? child_rip+0x0/0x12

Code: 1e 48 83 7b 38 00 75 08 48 c7 43 38 f0 e8 82 80 48 83 7b 30 00 75 08 48 c7 43 30 d0 e9 82 80 48 c7 c7 60 24 cc 80 e8 bd 5a 54 00 <48> 8b 45 60 48 89 6b 58 48 89 5d 60 48 89 43 50 fe 05 f5 25 a0
RIP  [<ffffffff802bfe55>] proc_register+0xe7/0x10f
 RSP <ffff810824c57e60>
CR2: 000000000000005f
---[ end trace 02c2d78def82877a ]---
Kernel panic - not syncing: Attempted to kill init!

it turns out some variables near end of bss are corrupted already.

in System.map we have
ffffffff80d40420 b rsi_table
ffffffff80d40620 B krb5_seq_lock
ffffffff80d40628 b i.20437
ffffffff80d40630 b xprt_rdma_inline_write_padding
ffffffff80d40638 b sunrpc_table_header
ffffffff80d40640 b zero
ffffffff80d40644 b min_memreg
ffffffff80d40648 b rpcrdma_tk_lock_g
ffffffff80d40650 B sctp_assocs_id_lock
ffffffff80d40658 B proc_net_sctp
ffffffff80d40660 B sctp_assocs_id
ffffffff80d40680 B sysctl_sctp_mem
ffffffff80d40690 B sysctl_sctp_rmem
ffffffff80d406a0 B sysctl_sctp_wmem
ffffffff80d406b0 b sctp_ctl_socket
ffffffff80d406b8 b sctp_pf_inet6_specific
ffffffff80d406c0 b sctp_pf_inet_specific
ffffffff80d406c8 b sctp_af_v4_specific
ffffffff80d406d0 b sctp_af_v6_specific
ffffffff80d406d8 b sctp_rand.33270
ffffffff80d406dc b sctp_memory_pressure
ffffffff80d406e0 b sctp_sockets_allocated
ffffffff80d406e4 b sctp_memory_allocated
ffffffff80d406e8 b sctp_sysctl_header
ffffffff80d406f0 b zero
ffffffff80d406f4 A __bss_stop
ffffffff80d406f4 A _end

and setup_node_bootmem() will use that page 0xd40000 for bootmap
Bootmem setup node 0 0000000000000000-0000000828000000
  NODE_DATA [000000000008a485 - 0000000000091484]
  bootmap [0000000000d406f4 -  0000000000e456f3] pages 105
Bootmem setup node 1 0000000828000000-0000001028000000
  NODE_DATA [0000000828000000 - 0000000828006fff]
  bootmap [0000000828007000 -  0000000828106fff] pages 100
Bootmem setup node 2 0000001028000000-0000001828000000
  NODE_DATA [0000001028000000 - 0000001028006fff]
  bootmap [0000001028007000 -  0000001028106fff] pages 100
Bootmem setup node 3 0000001828000000-0000002028000000
  NODE_DATA [0000001828000000 - 0000001828006fff]
  bootmap [0000001828007000 -  0000001828106fff] pages 100

setup_node_bootmem() makes NODE_DATA cacheline aligned,
and bootmap is page-aligned.

the patch updates find_e820_area() to make sure we can meet
the alignment constraints.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 20 insertions, 15 deletions

diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index d33954866085..9f533deb9dad 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -84,25 +84,23 @@ static int __init populate_memnodemap(const struct bootnode *nodes,
 
 static int __init allocate_cachealigned_memnodemap(void)
 {
-        unsigned long pad, pad_addr;
+        unsigned long addr;
 
         memnodemap = memnode.embedded_map;
         if (memnodemapsize <= ARRAY_SIZE(memnode.embedded_map))
                 return 0;
 
-        pad = L1_CACHE_BYTES - 1;
-        pad_addr = 0x8000;
-        nodemap_size = pad + sizeof(s16) * memnodemapsize;
-        nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT,
-                                      nodemap_size);
+        addr = 0x8000;
+        nodemap_size = round_up(sizeof(s16) * memnodemapsize, L1_CACHE_BYTES);
+        nodemap_addr = find_e820_area(addr, end_pfn<<PAGE_SHIFT,
+                                      nodemap_size, L1_CACHE_BYTES);
         if (nodemap_addr == -1UL) {
                 printk(KERN_ERR
                        "NUMA: Unable to allocate Memory to Node hash map\n");
                 nodemap_addr = nodemap_size = 0;
                 return -1;
         }
-        pad_addr = (nodemap_addr + pad) & ~pad;
-        memnodemap = phys_to_virt(pad_addr);
+        memnodemap = phys_to_virt(nodemap_addr);
         reserve_early(nodemap_addr, nodemap_addr + nodemap_size, "MEMNODEMAP");
 
         printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
@@ -164,15 +162,17 @@ int early_pfn_to_nid(unsigned long pfn)
 }
 
 static void * __init early_node_mem(int nodeid, unsigned long start,
-                                    unsigned long end, unsigned long size)
+                                    unsigned long end, unsigned long size,
+                                    unsigned long align)
 {
-        unsigned long mem = find_e820_area(start, end, size);
+        unsigned long mem = find_e820_area(start, end, size, align);
         void *ptr;
 
-        if (mem != -1L)
+        if (mem != -1L) {
+                mem = round_up(mem, align);
                 return __va(mem);
-        ptr = __alloc_bootmem_nopanic(size,
-                                SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS));
+        }
+        ptr = __alloc_bootmem_nopanic(size, align, __pa(MAX_DMA_ADDRESS));
         if (ptr == NULL) {
                 printk(KERN_ERR "Cannot find %lu bytes in node %d\n",
                        size, nodeid);
@@ -198,7 +198,8 @@ void __init setup_node_bootmem(int nodeid, unsigned long start,
         start_pfn = start >> PAGE_SHIFT;
         end_pfn = end >> PAGE_SHIFT;
 
-        node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
+        node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
+                                           SMP_CACHE_BYTES);
         if (node_data[nodeid] == NULL)
                 return;
         nodedata_phys = __pa(node_data[nodeid]);
@@ -211,8 +212,12 @@ void __init setup_node_bootmem(int nodeid, unsigned long start,
         /* Find a place for the bootmem map */
         bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
         bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
+        /*
+         * SMP_CAHCE_BYTES could be enough, but init_bootmem_node like
+         * to use that to align to PAGE_SIZE
+         */
         bootmap = early_node_mem(nodeid, bootmap_start, end,
-                                        bootmap_pages<<PAGE_SHIFT);
+                                 bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
         if (bootmap == NULL)  {
                 if (nodedata_phys < start || nodedata_phys >= end)
                         free_bootmem((unsigned long)node_data[nodeid],