Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756516AbbEUTdq (ORCPT ); Thu, 21 May 2015 15:33:46 -0400 Received: from mail-qk0-f176.google.com ([209.85.220.176]:33316 "EHLO mail-qk0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756386AbbEUTda (ORCPT ); Thu, 21 May 2015 15:33:30 -0400 From: j.glisse@gmail.com To: akpm@linux-foundation.org Cc: , linux-mm@kvack.org, Linus Torvalds , , Mel Gorman , "H. Peter Anvin" , Peter Zijlstra , Andrea Arcangeli , Johannes Weiner , Larry Woodman , Rik van Riel , Dave Airlie , Brendan Conoboy , Joe Donohue , Duncan Poole , Sherry Cheung , Subhash Gutti , John Hubbard , Mark Hairgrove , Lucien Dunning , Cameron Buschardt , Arvind Gopalakrishnan , Haggai Eran , Shachar Raindel , Liran Liss , Roland Dreier , Ben Sander , Greg Stoner , John Bridgman , Michael Mantor , Paul Blinzer , Laurent Morichetti , Alexander Deucher , Oded Gabbay , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= Subject: [PATCH 04/36] mmu_notifier: allow range invalidation to exclude a specific mmu_notifier Date: Thu, 21 May 2015 15:31:13 -0400 Message-Id: <1432236705-4209-5-git-send-email-j.glisse@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1432236705-4209-1-git-send-email-j.glisse@gmail.com> References: <1432236705-4209-1-git-send-email-j.glisse@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6202 Lines: 179 From: Jérôme Glisse This patch allow to invalidate a range while excluding call to a specific mmu_notifier which allow for a subsystem to invalidate a range for everyone but itself. Signed-off-by: Jérôme Glisse --- include/linux/mmu_notifier.h | 60 +++++++++++++++++++++++++++++++++++++++----- mm/mmu_notifier.c | 16 +++++++++--- 2 files changed, 67 insertions(+), 9 deletions(-) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 283ad26..867ca06 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -294,11 +294,15 @@ extern void __mmu_notifier_invalidate_page(struct mm_struct *mm, struct page *page, enum mmu_event event); extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - struct mmu_notifier_range *range); + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude); extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - struct mmu_notifier_range *range); + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude); extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, - unsigned long start, unsigned long end); + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude); extern bool mmu_notifier_range_is_valid(struct mm_struct *mm, unsigned long start, unsigned long end); @@ -351,21 +355,46 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, struct mmu_notifier_range *range) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_start(mm, range); + __mmu_notifier_invalidate_range_start(mm, range, NULL); } static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, struct mmu_notifier_range *range) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_end(mm, range); + __mmu_notifier_invalidate_range_end(mm, range, NULL); } static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, unsigned long start, unsigned long end) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range(mm, start, end); + __mmu_notifier_invalidate_range(mm, start, end, NULL); +} + +static inline void mmu_notifier_invalidate_range_start_excluding(struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range_start(mm, range, exclude); +} + +static inline void mmu_notifier_invalidate_range_end_excluding(struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range_end(mm, range, exclude); +} + +static inline void mmu_notifier_invalidate_range_excluding(struct mm_struct *mm, + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range(mm, start, end, exclude); } static inline void mmu_notifier_mm_init(struct mm_struct *mm) @@ -515,6 +544,25 @@ static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, { } +static inline void mmu_notifier_invalidate_range_start_excluding(struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ +} + +static inline void mmu_notifier_invalidate_range_end_excluding(struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ +} + +static inline void mmu_notifier_invalidate_range_excluding(struct mm_struct *mm, + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) +{ +} + static inline void mmu_notifier_mm_init(struct mm_struct *mm) { } diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 2ff6d43..43172c6 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -175,7 +175,8 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm, } void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - struct mmu_notifier_range *range) + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; @@ -188,6 +189,8 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; if (mn->ops->invalidate_range_start) mn->ops->invalidate_range_start(mn, mm, range); } @@ -196,13 +199,16 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start); void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - struct mmu_notifier_range *range) + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; int id; id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; /* * Call invalidate_range here too to avoid the need for the * subsystem of having to register an invalidate_range_end @@ -233,13 +239,17 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_end); void __mmu_notifier_invalidate_range(struct mm_struct *mm, - unsigned long start, unsigned long end) + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; int id; id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; if (mn->ops->invalidate_range) mn->ops->invalidate_range(mn, mm, start, end); } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/