linux/arch
Yinghai Lu 9aebbdb637 x86, numa: fix boot without RAM on node0 again
Commit e534c7c5f8 ("numa: x86_64: use generic percpu var
numa_node_id() implementation") broke numa systems that don't have ram
on node0 when MEMORY_HOTPLUG is enabled, because cpu_up() will call
cpu_to_node() before per_cpu(numa_node) is setup for APs.

When Node0 doesn't have RAM, on x86, cpus already round it to nearest
node with RAM in x86_cpu_to_node_map.  and per_cpu(numa_node) is not set
up until in c_init for APs.

When later cpu_up() calling cpu_to_node() will get 0 again, and make it
online even there is no RAM on node0.  so later all APs can not booted up,
and later will have panic.

[    1.611101] On node 0 totalpages: 0
.........
[    2.608558] On node 0 totalpages: 0
[    2.612065] Brought up 1 CPUs
[    2.615199] Total of 1 processors activated (3990.31 BogoMIPS).
...
   93.225341] calling  loop_init+0x0/0x1a4 @ 1
[   93.229314] PERCPU: allocation failed, size=80 align=8, failed to populate
[   93.246539] Pid: 1, comm: swapper Tainted: G        W   2.6.35-rc4-tip-yh-04371-gd64e6c4-dirty #354
[   93.264621] Call Trace:
[   93.266533]  [<ffffffff81125e43>] pcpu_alloc+0x83a/0x8e7
[   93.270710]  [<ffffffff81125f15>] __alloc_percpu+0x10/0x12
[   93.285849]  [<ffffffff8140786c>] alloc_disk_node+0x94/0x16d
[   93.291811]  [<ffffffff81407956>] alloc_disk+0x11/0x13
[   93.306157]  [<ffffffff81503e51>] loop_alloc+0xa7/0x180
[   93.310538]  [<ffffffff8277ef48>] loop_init+0x9b/0x1a4
[   93.324909]  [<ffffffff8277eead>] ? loop_init+0x0/0x1a4
[   93.329650]  [<ffffffff810001f2>] do_one_initcall+0x57/0x136
[   93.345197]  [<ffffffff827486d0>] kernel_init+0x184/0x20e
[   93.348146]  [<ffffffff81034954>] kernel_thread_helper+0x4/0x10
[   93.365194]  [<ffffffff81c7cc3c>] ? restore_args+0x0/0x30
[   93.369305]  [<ffffffff8274854c>] ? kernel_init+0x0/0x20e
[   93.386011]  [<ffffffff81034950>] ? kernel_thread_helper+0x0/0x10
[   93.392047] loop: out of memory
...

Try to assign per_cpu(numa_node) early

[akpm@linux-foundation.org: tidy up code comment]
Signed-off-by: Yinghai <yinghai@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Acked-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-07-20 16:25:40 -07:00
..
alpha alpha: Detect Super IO chip, no IDE on Avanti, enable EPP19 2010-06-15 14:19:08 -04:00
arm Merge master.kernel.org:/home/rmk/linux-2.6-arm 2010-07-14 17:28:13 -07:00
avr32 avr32: use asm-generic/scatterlist.h 2010-05-27 09:12:54 -07:00
blackfin blackfin: use use asm-generic/scatterlist.h 2010-05-27 09:12:55 -07:00
cris Merge branch 'for-linus' of git://www.jni.nu/cris 2010-06-01 08:51:25 -07:00
frv FRV: Reinstate null behaviour for the GDB remote protocol 'p' command 2010-06-09 12:42:44 -07:00
h8300 Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
ia64 [IA64] Fix spinaphore down_spin() 2010-06-30 10:46:16 -07:00
m32r m32r: invoke oom-killer from page fault 2010-06-04 15:21:44 -07:00
m68k Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k 2010-05-27 10:19:19 -07:00
m68knommu Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
microblaze lmb: rename to memblock 2010-07-14 17:14:00 +10:00
mips MIPS: Return after handling coprocessor 2 exception 2010-07-05 17:17:33 +01:00
mn10300 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2010-06-11 14:15:44 -07:00
parisc Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
powerpc Merge branch 'lmb-to-memblock' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2010-07-14 17:27:44 -07:00
s390 [S390] Update default configuration. 2010-06-08 18:58:23 +02:00
score asm-generic: remove ISA_DMA_THRESHOLD in scatterlist.h 2010-05-27 09:12:54 -07:00
sh lmb: rename to memblock 2010-07-14 17:14:00 +10:00
sparc lmb: rename to memblock 2010-07-14 17:14:00 +10:00
um um: os-linux/mem.c needs sys/stat.h 2010-06-29 15:29:32 -07:00
x86 x86, numa: fix boot without RAM on node0 again 2010-07-20 16:25:40 -07:00
xtensa xtensa: invoke oom-killer from page fault 2010-06-04 15:21:44 -07:00
.gitignore
Kconfig hw-breakpoints: Separate constraint space for data and instruction breakpoints 2010-05-01 04:32:11 +02:00