On Thu, 2011-03-10 at 10:00 +1100, Benjamin Herrenschmidt wrote:
> This feature triggers nasty races in the scheduler between the
> rebuilding of the topology and the load balancing code, causing
> the machine to hang.
>
> Disable it for now until the races are fixed.
>
> Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> ---
>
> Jesse: I'm sending that to Linus now. We'll sort things out for the
> next release.
>
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index fd48123..74f1baa 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -1516,6 +1516,7 @@ int start_topology_update(void)
> {
> int rc = 0;
>
> +#if 0 /* Disabled until races with load balancing are fixed */
> if (firmware_has_feature(FW_FEATURE_VPHN) &&
> get_lppaca()->shared_proc) {
> vphn_enabled = 1;
> @@ -1524,6 +1525,7 @@ int start_topology_update(void)
> set_topology_timer();
> rc = 1;
> }
> +#endif
Turning that into if (0 && instead to avoid compiler warnings
and thus build failures
Cheers,
Ben.
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