linux-kernel - [PATCH 8/9] xen/mmu: use apply_to_page_range_batch() in xen_remap_domain_mfn

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Date:	Wed, 15 Dec 2010 14:19:54 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Linux-MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 8/9] xen/mmu: use apply_to_page_range_batch() in xen_remap_domain_mfn_range()

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/mmu.c |   19 ++++++++++++-------
 1 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 2b2b98a..930bddc 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2656,14 +2656,19 @@ struct remap_data {
 	struct mmu_update *mmu_update;
 };
 
-static int remap_area_mfn_pte_fn(pte_t *ptep, unsigned long addr, void *data)
+static int remap_area_mfn_pte_fn(pte_t *ptep, unsigned count,
+				 unsigned long addr, void *data)
 {
 	struct remap_data *rmd = data;
-	pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
 
-	rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
-	rmd->mmu_update->val = pte_val_ma(pte);
-	rmd->mmu_update++;
+	while (count--) {
+		pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
+
+		rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
+		rmd->mmu_update->val = pte_val_ma(pte);
+		rmd->mmu_update++;
+		ptep++;
+	}
 
 	return 0;
 }
@@ -2692,8 +2697,8 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
 		range = (unsigned long)batch << PAGE_SHIFT;
 
 		rmd.mmu_update = mmu_update;
-		err = apply_to_page_range(vma->vm_mm, addr, range,
-					  remap_area_mfn_pte_fn, &rmd);
+		err = apply_to_page_range_batch(vma->vm_mm, addr, range,
+						remap_area_mfn_pte_fn, &rmd);
 		if (err)
 			goto out;
 
-- 
1.7.3.3

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