diff options
| author |   Prarit Bhargava <prarit@redhat.com> | 2009-12-09 13:36:45 -0500 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@zytor.com> | 2009-12-10 17:19:03 -0800 |
| commit | ebb682f522411abbe358059a256a8672ec0bd55b (patch) | |
| tree | ff8ebb34f17ec3c3d445857be9da7fd35f4579a0 /kernel/cpu.c | |
| parent | Merge branch 'amd-iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent (diff) | |
| download | linux-dev-ebb682f522411abbe358059a256a8672ec0bd55b.tar.xz linux-dev-ebb682f522411abbe358059a256a8672ec0bd55b.zip | |
x86, AMD: Fix stale cpuid4_info shared_map data in shared_cpu_map cpumasks
The per_cpu cpuid4_info shared_map can contain stale data when CPUs are added
and removed.
The stale data can lead to a NULL pointer derefernce panic on a remove of a
CPU that has had siblings previously removed.
This patch resolves the panic by verifying a cpu is actually online before
adding it to the shared_cpu_map, only examining cpus that are part of
the same lower level cache, and by updating other siblings lowest level cache
maps when a cpu is added.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
LKML-Reference: <20091209183336.17855.98708.sendpatchset@prarit.bos.redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'kernel/cpu.c')
0 files changed, 0 insertions, 0 deletions