linux-kernel - [PATCH RFC V6 2/11] x86/ticketlock: don't inline _spin

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Date:	Wed, 21 Mar 2012 15:51:07 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM <kvm@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Virtualization <virtualization@...ts.linux-foundation.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Stephan Diestelhorst <stephan.diestelhorst@....com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Attilio Rao <attilio.rao@...rix.com>
Subject: [PATCH RFC V6 2/11]  x86/ticketlock: don't inline _spin_unlock when using paravirt spinlocks

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

The code size expands somewhat, and its probably better to just call
a function rather than inline it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
---
 arch/x86/Kconfig     |    3 +++
 kernel/Kconfig.locks |    2 +-
 2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5bed94e..10c28ec 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -623,6 +623,9 @@ config PARAVIRT_SPINLOCKS
 
 	  If you are unsure how to answer this question, answer N.
 
+config ARCH_NOINLINE_SPIN_UNLOCK
+       def_bool PARAVIRT_SPINLOCKS
+
 config PARAVIRT_CLOCK
 	bool
 
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index 5068e2a..584637b 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -125,7 +125,7 @@ config INLINE_SPIN_LOCK_IRQSAVE
 		 ARCH_INLINE_SPIN_LOCK_IRQSAVE
 
 config INLINE_SPIN_UNLOCK
-	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK)
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK) && !ARCH_NOINLINE_SPIN_UNLOCK
 
 config INLINE_SPIN_UNLOCK_BH
 	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_BH

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