linux-kernel - [PATCH 7/9] mm: allow preemption in apply_to_pte

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Message-Id: <72c108781364f9cbf0f9094978d59c271602896f.1234988621.git.jeremy.fitzhardinge@citrix.com>
Date:	Wed, 18 Feb 2009 14:30:16 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Zachary Amsden <zach@...are.com>,
	Alok N Kataria <akataria@...are.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 7/9] mm: allow preemption in apply_to_pte_range

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

Preemption is now allowed for lazy mmu mode, so don't disable
it for the inner loop of apply_to_pte_range.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 mm/memory.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index b80cc31..baa999e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1718,7 +1718,6 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 
 	BUG_ON(pmd_huge(*pmd));
 
-	preempt_disable();
 	arch_enter_lazy_mmu_mode();
 
 	token = pmd_pgtable(*pmd);
@@ -1730,7 +1729,6 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 	} while (pte++, addr += PAGE_SIZE, addr != end);
 
 	arch_leave_lazy_mmu_mode();
-	preempt_enable();
 
 	if (mm != &init_mm)
 		pte_unmap_unlock(pte-1, ptl);
-- 
1.6.0.6

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