linux-kernel - [PATCH 2/2] x86/entry: Inline enter_from_user

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Message-Id: <1464611414-12379-3-git-send-email-pbonzini@redhat.com>
Date:	Mon, 30 May 2016 14:30:14 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, x86@...nel.org
Cc:	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...nel.org.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 2/2] x86/entry: Inline enter_from_user_mode

This matches what is already done for prepare_exit_to_usermode,
and saves about 60 clock cycles (4% speedup) with the benchmark
in the previous commit message.

Cc: Andy Lutomirski <luto@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/entry/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 946bc1a..582bbc8 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -40,7 +40,7 @@ static struct thread_info *pt_regs_to_thread_info(struct pt_regs *regs)
 
 #ifdef CONFIG_CONTEXT_TRACKING
 /* Called on entry from user mode with IRQs off. */
-__visible void enter_from_user_mode(void)
+__visible inline void enter_from_user_mode(void)
 {
 	CT_WARN_ON(ct_state() != CONTEXT_USER);
 	__user_exit();
-- 
2.4.3