* Mike Galbraith | 2013-06-19 16:26:18 [+0200]:
>
>The below is what I use to run -rt on UV boxen, diff generated against
>3.8-rt. Should the lock conversions perhaps wander to mainline?
They seem to come from NMI or irq off region so if you can't change this
why not.
>Signed-off-by: Mike Galbraith <bitbucket@xxxxxxxxx>
>
>Index: linux-2.6/arch/x86/platform/uv/uv_time.c
>===================================================================
>--- linux-2.6.orig/arch/x86/platform/uv/uv_time.c
>+++ linux-2.6/arch/x86/platform/uv/uv_time.c
>@@ -300,13 +300,18 @@ static int uv_rtc_unset_timer(int cpu, i
> static cycle_t uv_read_rtc(struct clocksource *cs)
> {
> unsigned long offset;
>+ cycle_t cycles;
>
>+ migrate_disable();
> if (uv_get_min_hub_revision_id() == 1)
> offset = 0;
> else
> offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
>
>- return (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
>+ cycles = (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
>+ migrate_enable();
>+
>+ return cycles;
> }
You try to ensure not to switch CPUs between uv_blade_processor_id() and
uv_read_local_mmr()'s final HW access, right?
Sebastian
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