releases/5.0.15/drivers-hv-vmbus-remove-the-undesired-put_cpu_ptr-in-hv_synic_cleanup.patch

   1 From a0033bd1eae4650b69be07c17cb87393da584563 Mon Sep 17 00:00:00 2001
   2 From: Dexuan Cui <decui@microsoft.com>
   3 Date: Fri, 12 Apr 2019 23:34:45 +0000
   4 Subject: Drivers: hv: vmbus: Remove the undesired put_cpu_ptr() in hv_synic_cleanup()
   5
   6 From: Dexuan Cui <decui@microsoft.com>
   7
   8 commit a0033bd1eae4650b69be07c17cb87393da584563 upstream.
   9
  10 With CONFIG_DEBUG_PREEMPT=y, the put_cpu_ptr() triggers an underflow
  11 warning in preempt_count_sub().
  12
  13 Fixes: 37cdd991fac8 ("vmbus: put related per-cpu variable together")
  14 Cc: stable@vger.kernel.org
  15 Cc: Stephen Hemminger <sthemmin@microsoft.com>
  16 Signed-off-by: Dexuan Cui <decui@microsoft.com>
  17 Reviewed-by: Michael Kelley <mikelley@microsoft.com>
  18 Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
  19 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  20
  21 ---
  22  drivers/hv/hv.c |    1 -
  23  1 file changed, 1 deletion(-)
  24
  25 --- a/drivers/hv/hv.c
  26 +++ b/drivers/hv/hv.c
  27 @@ -408,7 +408,6 @@ int hv_synic_cleanup(unsigned int cpu)
  28
  29                 clockevents_unbind_device(hv_cpu->clk_evt, cpu);
  30                 hv_ce_shutdown(hv_cpu->clk_evt);
  31 -               put_cpu_ptr(hv_cpu);
  32         }
  33
  34         hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);