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| author | Nathan Fontenot <nfont@linux.vnet.ibm.com> | 2018-10-29 13:43:36 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-05 22:29:13 +0200 |
| commit | 0c724ad4f8980cc15f071a51c83f3485ee164b54 (patch) | |
| tree | 7f39e78c5be719f1de4fcd4a956cc685a76a65e7 /arch/powerpc/include/asm/topology.h | |
| parent | 876c9787244d932048ae5a7545a0ca15d94ba6fc (diff) | |
| download | linux-stable-0c724ad4f8980cc15f071a51c83f3485ee164b54.tar.gz linux-stable-0c724ad4f8980cc15f071a51c83f3485ee164b54.tar.bz2 linux-stable-0c724ad4f8980cc15f071a51c83f3485ee164b54.zip | |
powerpc/pseries: Perform full re-add of CPU for topology update post-migration
[ Upstream commit 81b61324922c67f73813d8a9c175f3c153f6a1c6 ]
On pseries systems, performing a partition migration can result in
altering the nodes a CPU is assigned to on the destination system. For
exampl, pre-migration on the source system CPUs are in node 1 and 3,
post-migration on the destination system CPUs are in nodes 2 and 3.
Handling the node change for a CPU can cause corruption in the slab
cache if we hit a timing where a CPUs node is changed while cache_reap()
is invoked. The corruption occurs because the slab cache code appears
to rely on the CPU and slab cache pages being on the same node.
The current dynamic updating of a CPUs node done in arch/powerpc/mm/numa.c
does not prevent us from hitting this scenario.
Changing the device tree property update notification handler that
recognizes an affinity change for a CPU to do a full DLPAR remove and
add of the CPU instead of dynamically changing its node resolves this
issue.
Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Tested-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/powerpc/include/asm/topology.h')
| -rw-r--r-- | arch/powerpc/include/asm/topology.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index 8b3b46b7b0f2..229c91bcf616 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -90,6 +90,8 @@ static inline int prrn_is_enabled(void) #define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu)) #define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu)) #define topology_core_id(cpu) (cpu_to_core_id(cpu)) + +int dlpar_cpu_readd(int cpu); #endif #endif |