From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Fri, 2 Dec 2016 15:00:41 +0000 (+0000)
Subject: x86/mcheck: Drop unnecessary barriers
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~875
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=d72f5abff765b6408ef940ced437d000643f7547;p=xen.git

x86/mcheck: Drop unnecessary barriers

spin_unlock() has full barrier semantics already.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/arch/x86/cpu/mcheck/mctelem.c b/xen/arch/x86/cpu/mcheck/mctelem.c
index 492e2af77f..35431df346 100644
--- a/xen/arch/x86/cpu/mcheck/mctelem.c
+++ b/xen/arch/x86/cpu/mcheck/mctelem.c
@@ -520,7 +520,6 @@ mctelem_cookie_t mctelem_consume_oldest_begin(mctelem_class_t which)
 	}
 
 	mctelem_processing_hold(tep);
-	wmb();
 	spin_unlock(&processing_lock);
 	return MCTE2COOKIE(tep);
 }
@@ -531,7 +530,6 @@ void mctelem_consume_oldest_end(mctelem_cookie_t cookie)
 
 	spin_lock(&processing_lock);
 	mctelem_processing_release(tep);
-	wmb();
 	spin_unlock(&processing_lock);
 }
 
@@ -547,7 +545,6 @@ void mctelem_ack(mctelem_class_t which, mctelem_cookie_t cookie)
 	spin_lock(&processing_lock);
 	if (tep == mctctl.mctc_processing_head[target])
 		mctelem_processing_release(tep);
-	wmb();
 	spin_unlock(&processing_lock);
 }