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| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2007-11-07 02:12:58 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@apollo.(none)> | 2007-11-17 16:27:00 +0100 |
| commit | 903675569e278af86aa08c2af238b0ab997065d1 (patch) | |
| tree | f46ca0146d62c15bfc7e46979669ad8d3ed362a6 | |
| parent | 4307d1e5ada595c87f9a4d16db16ba5edb70dcb1 (diff) | |
x86: fix cpu-hotplug regression
Commit d435d862baca3e25e5eec236762a43251b1e7ffc
("cpu hotplug: mce: fix cpu hotplug error handling")
changed the error handling in mce_cpu_callback.
In cases where not all CPUs are brought up during
boot (e.g. using maxcpus and additional_cpus parameters)
mce_cpu_callback now returns NOTFIY_BAD because
for such CPUs cpu_data is not completely filled when
the notifier is called. Thus mce_create_device fails right
at its beginning:
if (!mce_available(&cpu_data[cpu]))
return -EIO;
As a quick fix I suggest to check boot_cpu_data for MCE.
To reproduce this regression:
(1) boot with maxcpus=2 addtional_cpus=2 on a 4 CPU x86-64 system
(2) # echo 1 >/sys/devices/system/cpu/cpu2/online
-bash: echo: write error: Invalid argument
dmesg shows:
_cpu_up: attempt to bring up CPU 2 failed
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c index 447b351f1f2..4b21d29fb5a 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_64.c +++ b/arch/x86/kernel/cpu/mcheck/mce_64.c @@ -810,7 +810,7 @@ static __cpuinit int mce_create_device(unsigned int cpu) int err; int i; - if (!mce_available(&cpu_data(cpu))) + if (!mce_available(&boot_cpu_data)) return -EIO; memset(&per_cpu(device_mce, cpu).kobj, 0, sizeof(struct kobject)); |