Hi Len, Rafeal,
I stumbled over acpi_pad (yuck! ;-), but noticed that you don't set the
task in polling mode while using mwait. This means we'll still happily
send an IPI to wake you up.
A little something like the below should do; you might even be able to
remove the smp_mb() but since it is completely undocumented (another
fail) I couldn't tell if the implied barrier in
current_set_polling_and_test() suffices to replace it, so I left it.
If it compiles and works; change it to a proper SOB:
Maybe-Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
---
drivers/acpi/acpi_pad.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index fc6008fbce35..e9126efe7786 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -195,8 +195,10 @@ static int power_saving_thread(void *data)
__monitor((void *)¤t_thread_info()->flags, 0, 0);
smp_mb();
- if (!need_resched())
+ if (!current_set_polling_and_test()) {
__mwait(power_saving_mwait_eax, 1);
+ __current_clr_polling();
+ }
start_critical_timings();
if (lapic_marked_unstable)
--
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