diff options
| author | Prarit Bhargava <prarit@redhat.com> | 2009-12-09 13:36:45 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-05-12 14:57:06 -0700 |
| commit | 21dc3d5c88916458f26002e6090ebc060c646dc8 (patch) | |
| tree | 569bf42f3747acb2ba2f4b06fac0e9e9bd117454 /sound | |
| parent | 4515b172cd9fc6bd7c9ee2264ed650411fcd118e (diff) | |
x86, AMD: Fix stale cpuid4_info shared_map data in shared_cpu_map cpumasks
commit ebb682f522411abbe358059a256a8672ec0bd55b upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions