x86-PAE-preempt-rt-fix.patch

From 6afd06151a9f6e8ca2378f08f6f4c327caa3c555 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 08:44:52 -0500
Subject: [PATCH] x86: PAE preempt-rt fix

commit dabac300b124a630d2521f3cbf510b194f1aaba8 in tip.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 arch/x86/include/asm/pgtable-3level.h |    2 ++
 arch/x86/mm/pgtable.c                 |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h
index 177b016..0e989a1 100644
--- a/arch/x86/include/asm/pgtable-3level.h
+++ b/arch/x86/include/asm/pgtable-3level.h
@@ -71,6 +71,7 @@ static inline void pud_clear(pud_t *pudp)
 {
 	unsigned long pgd;
 
+	preempt_disable();
 	set_pud(pudp, __pud(0));
 
 	/*
@@ -86,6 +87,7 @@ static inline void pud_clear(pud_t *pudp)
 	if (__pa(pudp) >= pgd && __pa(pudp) <
 	    (pgd + sizeof(pgd_t)*PTRS_PER_PGD))
 		write_cr3(pgd);
+	preempt_enable();
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 5c4ee42..d8fa0d4 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -154,6 +154,7 @@ void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
 	   reserved at the pmd (PDPT) level. */
 	set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
 
+	preempt_disable();
 	/*
 	 * According to Intel App note "TLBs, Paging-Structure Caches,
 	 * and Their Invalidation", April 2007, document 317080-001,
@@ -162,6 +163,7 @@ void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
 	 */
 	if (mm == current->active_mm)
 		write_cr3(read_cr3());
+	preempt_enable();
 }
 #else  /* !CONFIG_X86_PAE */
 
-- 
1.7.0.4