Michael Bringmann <m...@linux.vnet.ibm.com> writes:
> The PPC mobility code may receive RTAS requests to perform PRRN
> topology changes at any time, including during LPAR migration
> operations. In some configurations where the affinity of CPUs
> or memory is being changed on that platform, the PRRN requests
> may apply or refer to outdated information prior to the complete
> update of the device-tree. This patch changes the duration for
> which topology updates are suppressed during LPAR migrations from
> just the rtas_ibm_suspend_me / 'ibm,suspend-me' call(s) to cover
> the entire 'migration_store' operation to allow all changes to
> the device-tree to be applied prior to accepting and applying any
> PRRN requests.
>
> For tracking purposes, pr_info notices are added to the functions
> start_topology_update() and stop_topology_update() of 'numa.c'.
>
> Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
> ---
> arch/powerpc/kernel/rtas.c | 4 ----
> arch/powerpc/mm/numa.c | 6 ++++++
> arch/powerpc/platforms/pseries/mobility.c | 5 +++++
> 3 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
> index 8afd146..28d8b57 100644
> --- a/arch/powerpc/kernel/rtas.c
> +++ b/arch/powerpc/kernel/rtas.c
> @@ -981,8 +981,6 @@ int rtas_ibm_suspend_me(u64 handle)
> goto out;
> }
>
> - stop_topology_update();
> -
> /* Call function on all CPUs. One of us will make the
> * rtas call
> */
This doesn't apply to my next branch, it conflicts with:
85a88cabad57 ("powerpc/pseries: Disable CPU hotplug across migrations")
Can you please rebase it?
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=next
cheers
