linux-kernel - [PATCH] vmbus: Remove the undesired put_cpu_ptr() in hv_synic

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Date:   Fri, 12 Apr 2019 23:34:45 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>
CC:     "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "apw@...onical.com" <apw@...onical.com>,
        "olaf@...fle.de" <olaf@...fle.de>, vkuznets <vkuznets@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Dexuan Cui <decui@...rosoft.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: [PATCH] vmbus: Remove the undesired put_cpu_ptr() in
 hv_synic_cleanup()

With CONFIG_DEBUG_PREEMPT=y, the put_cpu_ptr() triggiers an underflow
warning in preempt_count_sub().

Fixes: 37cdd991fac8 ("vmbus: put related per-cpu variable together")
Cc: stable@...r.kernel.org
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
---
 drivers/hv/hv.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 632d25674e7f..45653029ee18 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -408,7 +408,6 @@ int hv_synic_cleanup(unsigned int cpu)
 
 		clockevents_unbind_device(hv_cpu->clk_evt, cpu);
 		hv_ce_shutdown(hv_cpu->clk_evt);
-		put_cpu_ptr(hv_cpu);
 	}
 
 	hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
-- 
2.19.1