From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758340Ab1FJXeM (ORCPT ); Fri, 10 Jun 2011 19:34:12 -0400 Received: from sous-sol.org ([216.99.217.87]:39633 "EHLO sequoia.sous-sol.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758297Ab1FJXeL (ORCPT ); Fri, 10 Jun 2011 19:34:11 -0400 Date: Fri, 10 Jun 2011 16:33:55 -0700 From: Chris Wright To: Andrea Arcangeli Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, chrisw@sous-sol.org Subject: [PATCH] mm: thp: minor lock simplification in __khugepaged_exit Message-ID: <20110610233355.GO23047@sequoia.sous-sol.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-08-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The lock is released first thing in all three branches. Simplify this by unconditionally releasing lock and remove else clause which was only there to be sure lock was released. Signed-off-by: Chris Wright --- mm/huge_memory.c | 6 ++---- 1 files changed, 2 insertions(+), 4 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 615d974..a032ddd 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1596,14 +1596,13 @@ void __khugepaged_exit(struct mm_struct *mm) list_del(&mm_slot->mm_node); free = 1; } + spin_unlock(&khugepaged_mm_lock); if (free) { - spin_unlock(&khugepaged_mm_lock); clear_bit(MMF_VM_HUGEPAGE, &mm->flags); free_mm_slot(mm_slot); mmdrop(mm); } else if (mm_slot) { - spin_unlock(&khugepaged_mm_lock); /* * This is required to serialize against * khugepaged_test_exit() (which is guaranteed to run @@ -1614,8 +1613,7 @@ void __khugepaged_exit(struct mm_struct *mm) */ down_write(&mm->mmap_sem); up_write(&mm->mmap_sem); - } else - spin_unlock(&khugepaged_mm_lock); + } } static void release_pte_page(struct page *page)