From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ie0-f173.google.com (mail-ie0-f173.google.com [209.85.223.173]) by kanga.kvack.org (Postfix) with ESMTP id 043D66B00A7 for ; Thu, 24 Jul 2014 21:10:35 -0400 (EDT) Received: by mail-ie0-f173.google.com with SMTP id tr6so3051872ieb.32 for ; Thu, 24 Jul 2014 18:10:35 -0700 (PDT) Received: from theia.8bytes.org (8bytes.org. [81.169.241.247]) by mx.google.com with ESMTP id s19si12233054wik.76.2014.07.24.07.36.17 for ; Thu, 24 Jul 2014 07:36:18 -0700 (PDT) From: Joerg Roedel Subject: [PATCH 1/3] mmu_notifier: Add mmu_notifier_invalidate_range() Date: Thu, 24 Jul 2014 16:35:39 +0200 Message-Id: <1406212541-25975-2-git-send-email-joro@8bytes.org> In-Reply-To: <1406212541-25975-1-git-send-email-joro@8bytes.org> References: <1406212541-25975-1-git-send-email-joro@8bytes.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Andrea Arcangeli , Peter Zijlstra , Rik van Riel , Hugh Dickins , Mel Gorman , Johannes Weiner Cc: Jerome Glisse , jroedel@suse.de, Jay.Cornwall@amd.com, Oded.Gabbay@amd.com, John.Bridgman@amd.com, Suravee.Suthikulpanit@amd.com, ben.sander@amd.com, Jesse Barnes , David Woodhouse , linux-kernel@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org From: Joerg Roedel This notifier closes an important gap with the current invalidate_range_start()/end() notifiers. The _start() part is called when all pages are still mapped while the _end() notifier is called when all pages are potentially unmapped and already freed. This does not allow to manage external (non-CPU) hardware TLBs with MMU-notifiers because there is no way to prevent that hardware will establish new TLB entries between the calls of these two functions. But this is a requirement to the subsytem that implements these existing notifiers. To allow managing external TLBs the MMU-notifiers need to catch the moment when pages are unmapped but not yet freed. This new notifier catches that moment and notifies the interested subsytem when pages that were unmapped are about to be freed. The new notifier will only be called between invalidate_range_start()/end(). Signed-off-by: Joerg Roedel --- include/linux/mmu_notifier.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index deca874..f333668 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -228,6 +228,11 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, __mmu_notifier_invalidate_range_start(mm, start, end); } +static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, + unsigned long start, unsigned long end) +{ +} + static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, unsigned long start, unsigned long end) { @@ -321,6 +326,11 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, { } +static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, + unsigned long start, unsigned long end) +{ +} + static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, unsigned long start, unsigned long end) { -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org