From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757659AbZC0SEh (ORCPT ); Fri, 27 Mar 2009 14:04:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754892AbZC0SCu (ORCPT ); Fri, 27 Mar 2009 14:02:50 -0400 Received: from gw.goop.org ([64.81.55.164]:58158 "EHLO abulafia.goop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752824AbZC0SCr (ORCPT ); Fri, 27 Mar 2009 14:02:47 -0400 From: Jeremy Fitzhardinge To: Andrew Morton Cc: the arch/x86 maintainers , Ingo Molnar , Linux Kernel Mailing List , Peter Zijlstra , Nick Piggin , Thomas Gleixner , Jeremy Fitzhardinge Subject: [PATCH 7/8] mm: allow preemption in apply_to_pte_range Date: Fri, 27 Mar 2009 11:02:42 -0700 Message-Id: <1238176963-21093-8-git-send-email-jeremy@goop.org> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1238176963-21093-1-git-send-email-jeremy@goop.org> References: <1238176963-21093-1-git-send-email-jeremy@goop.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeremy Fitzhardinge Impact: allow preemption in apply_to_pte_range updates to init_mm Preemption is now allowed for lazy mmu mode, so don't disable it for the inner loop of apply_to_pte_range. This only applies when doing updates to init_mm; user pagetables are still modified under the pte lock, so preemption is disabled anyway. Signed-off-by: Jeremy Fitzhardinge --- mm/memory.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 27f8677..ef11ac6 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1722,7 +1722,6 @@ 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); @@ -1734,7 +1733,6 @@ 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