linux-kernel - [PATCH v5 07/12] x86/tlbflush.h: Define __native_flush_tlb_global_irq

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Message-Id: <1356075872-3054-8-git-send-email-fenghua.yu@intel.com>
Date:	Thu, 20 Dec 2012 23:44:27 -0800
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"H Peter Anvin" <hpa@...or.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Tigran Aivazian" <tigran@...azian.fsnet.co.uk>,
	"Yinghai Lu" <yinghai@...nel.org>,
	"Andreas Herrmann" <andreas.herrmann3@....com>,
	"Borislav Petkov" <borislav.petkov@....com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"x86" <x86@...nel.org>
Cc:	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH v5 07/12] x86/tlbflush.h: Define __native_flush_tlb_global_irq_disabled()

From: Fenghua Yu <fenghua.yu@...el.com>

This function is called in __native_flush_tlb_global() and after
apply_microcode_early().

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/include/asm/tlbflush.h | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 0fee48e..50a7fc0 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -20,10 +20,20 @@ static inline void __native_flush_tlb(void)
 	native_write_cr3(native_read_cr3());
 }
 
+static inline void __native_flush_tlb_global_irq_disabled(void)
+{
+	unsigned long cr4;
+
+	cr4 = native_read_cr4();
+	/* clear PGE */
+	native_write_cr4(cr4 & ~X86_CR4_PGE);
+	/* write old PGE again and flush TLBs */
+	native_write_cr4(cr4);
+}
+
 static inline void __native_flush_tlb_global(void)
 {
 	unsigned long flags;
-	unsigned long cr4;
 
 	/*
 	 * Read-modify-write to CR4 - protect it from preemption and
@@ -32,11 +42,7 @@ static inline void __native_flush_tlb_global(void)
 	 */
 	raw_local_irq_save(flags);
 
-	cr4 = native_read_cr4();
-	/* clear PGE */
-	native_write_cr4(cr4 & ~X86_CR4_PGE);
-	/* write old PGE again and flush TLBs */
-	native_write_cr4(cr4);
+	__native_flush_tlb_global_irq_disabled();
 
 	raw_local_irq_restore(flags);
 }
-- 
1.8.0.1

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