linux-kernel - [RFC PATCH 08/21] x86/paravirt: Align paravirt thunk functions at 16-byte boundaries

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Message-Id: <549744692489efebebb40dd98809a6ab9762f5e2.1437150175.git.jpoimboe@redhat.com>
Date:	Fri, 17 Jul 2015 11:47:24 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 08/21] x86/paravirt: Align paravirt thunk functions at 16-byte boundaries

Paravirt thunk functions aren't aligned, which can impact performance
and is inconsistent with gcc-generated functions.

Align them at 16-byte boundaries to be consistent with gcc functions.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/include/asm/paravirt.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 2545f3e..5dcbf17 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -778,6 +778,7 @@ static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
 	extern typeof(func) __raw_callee_save_##func;			\
 									\
 	asm(".pushsection .text;"					\
+	    ".align 16;"						\
 	    ".globl " PV_THUNK_NAME(func) ";"				\
 	    ".type " PV_THUNK_NAME(func) ", @function;"			\
 	    PV_THUNK_NAME(func) ":"					\
-- 
2.1.0

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