| commit | 21dc3d5c88916458f26002e6090ebc060c646dc8 | |
| author | Prarit Bhargava <prarit@redhat.com> | |
| Wed, 9 Dec 2009 18:36:45 +0000 (9 13:36 -0500) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Wed, 12 May 2010 21:57:06 +0000 (12 14:57 -0700) | ||
| tree | 569bf42f3747acb2ba2f4b06fac0e9e9bd117454 | treesnapshot (tar.gz zip) |
| parent | 4515b172cd9fc6bd7c9ee2264ed650411fcd118e | commitdiff |
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>
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>
| arch/x86/kernel/cpu/intel_cacheinfo.c | diffblobblamehistory |