From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 12 Feb 2009 20:16:09 +0000 (+0100)
Subject: x86: CPA avoid repeated lazy mmu flush
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7ad9de6ac83bd825996d2de98c92e0f425c31050;p=linux-beck.git

x86: CPA avoid repeated lazy mmu flush

Impact: Flush the lazy MMU only once

Pending mmu updates only need to be flushed once to bring the
in-memory pagetable state up to date.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index f664bc1c4093..8ca0d8566fc8 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -575,14 +575,6 @@ static int __change_page_attr(struct cpa_data *cpa, int primary)
 		address = cpa->vaddr[cpa->curpage];
 	else
 		address = *cpa->vaddr;
-
-	/*
-	 * If we're called with lazy mmu updates enabled, the
-	 * in-memory pte state may be stale.  Flush pending updates to
-	 * bring them up to date.
-	 */
-	arch_flush_lazy_mmu_mode();
-
 repeat:
 	kpte = lookup_address(address, &level);
 	if (!kpte)
@@ -819,6 +811,13 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
 
 	vm_unmap_aliases();
 
+	/*
+	 * If we're called with lazy mmu updates enabled, the
+	 * in-memory pte state may be stale.  Flush pending updates to
+	 * bring them up to date.
+	 */
+	arch_flush_lazy_mmu_mode();
+
 	cpa.vaddr = addr;
 	cpa.numpages = numpages;
 	cpa.mask_set = mask_set;