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| author | Tejun Heo | 2009-09-01 14:12:28 +0200 |
|---|---|---|
| committer | Tejun Heo | 2009-09-01 14:23:18 +0200 |
| commit | 04a13c7c632e1fe04a5f6e6c83565d2559e37598 (patch) | |
| tree | 5f0d78abea4655a58c06c70f106d6265b97fae74 /drivers/cpufreq/cpufreq_conservative.c | |
| parent | percpu: use the right flag for get_vm_area() (diff) | |
| download | kernel-qcow2-linux-04a13c7c632e1fe04a5f6e6c83565d2559e37598.tar.gz kernel-qcow2-linux-04a13c7c632e1fe04a5f6e6c83565d2559e37598.tar.xz kernel-qcow2-linux-04a13c7c632e1fe04a5f6e6c83565d2559e37598.zip | |
percpu: don't assume existence of cpu0
percpu incorrectly assumed that cpu0 was always there which led to the
following warning and eventual oops on sparc machines w/o cpu0.
WARNING: at mm/percpu.c:651 pcpu_map+0xdc/0x100()
Modules linked in:
Call Trace:
[000000000045eb70] warn_slowpath_common+0x50/0xa0
[000000000045ebdc] warn_slowpath_null+0x1c/0x40
[00000000004d493c] pcpu_map+0xdc/0x100
[00000000004d59a4] pcpu_alloc+0x3e4/0x4e0
[00000000004d5af8] __alloc_percpu+0x18/0x40
[00000000005b112c] __percpu_counter_init+0x4c/0xc0
...
Unable to handle kernel NULL pointer dereference
...
I7: <sysfs_new_dirent+0x30/0x120>
Disabling lock debugging due to kernel taint
Caller[000000000053c1b0]: sysfs_new_dirent+0x30/0x120
Caller[000000000053c7a4]: create_dir+0x24/0xc0
Caller[000000000053c870]: sysfs_create_dir+0x30/0x80
Caller[00000000005990e8]: kobject_add_internal+0xc8/0x200
...
Kernel panic - not syncing: Attempted to kill the idle task!
This patch fixes the problem by backporting parts from devel branch to
make percpu core not depend on the existence of cpu0.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Meelis Roos <mroos@linux.ee>
Cc: David Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/cpufreq/cpufreq_conservative.c')
0 files changed, 0 insertions, 0 deletions